Adding a room addition is one of the smartest ways to increase your home’s living space, functionality, and value without the hassle of moving. Whether you’re dreaming of a sunroom, a walk-in closet, a glass room addition, or even a second-story expansion, the possibilities are vast and exciting. This comprehensive guide will explore the best room addition ideas and provide expert insights on cost ranges, designs, contractor selection, and room-specific strategies for small homes and large estates alike.

Table of Contents

Why Choose a Room Addition Over Moving?

Moving is expensive, time-consuming, and emotionally taxing. A room addition, on the other hand, allows you to stay in the neighborhood you love, customize your space, and significantly increase the resale value of your home.

Benefits of a room addition:

Maximizes your existing space
Increases property value
Tailors the house to your lifestyle needs
Avoids real estate commissions, moving costs, and property taxes
Adds extra space without leaving your location

Discover how Fineline Kitchens Inc. can help you expand your home with elegance:
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Room Addition Ideas That Transform Living Spaces

Modern open-concept living and dining room with a gray sectional sofa, wood beam ceiling, large windows, and a minimalist kitchen. — Credit: Decorilla

Bump-Out Additions: Big Results in Small Packages

When space is tight but the need for functionality is growing, bump-out additions—also known as micro-additions—offer a clever solution that doesn’t require a full-scale construction project. These compact expansions typically extend an existing room by 2 to 15 feet, allowing you to enhance usability without making structural changes to your home’s footprint or foundation.

For homeowners living in small homes, especially in urban or densely built neighborhoods, a bump-out offers an ideal way to make meaningful upgrades. You can bump out your kitchen to accommodate a breakfast nook or prep station, expand a bathroom to fit a luxurious tub, or even create a custom walk-in closet in a cramped bedroom. The key advantage is that it adds extra space exactly where it’s needed most—without overhauling your entire layout.

From a financial perspective, bump-outs are often more cost-effective than full-room additions. They typically don’t require new HVAC systems, major plumbing adjustments, or foundation work, making them budget-friendly and faster to complete. Because they often involve extending a cantilevered floor or slight foundation adjustment, these additions minimize construction time and disruption to your daily life.

Here are just a few practical ideas for bump-out additions:

Kitchen bump-out: Add a pantry, extend your countertop space, or build a cozy breakfast alcove
Bathroom bump-out: Create room for a double vanity or a soaking tub
Bedroom bump-out: Add square footage for a sitting area or small office nook
Living room bump-out: Make space for larger furniture or additional windows to increase natural light

Cost Range: $5,000–$30,000
Typical Depth: 2–15 feet
Average Cost per Square Foot: Around $200, depending on materials and finishes

Besides the obvious lifestyle benefits, bump-out additions also contribute to your home’s long-term resale value. While they may not count as a full additional room in real estate listings, the enhanced functionality and aesthetic improvements they bring often justify the investment.

If you’re looking to improve your kitchen with a smart bump-out solution, check out our curated selection of custom designs and remodels in our kitchen remodeling gallery. At Fineline Kitchens Inc., we specialize in tailoring your home’s layout to your lifestyle—efficiently, beautifully, and cost-effectively.

Ready to explore how a small addition can make a big difference? Book a consultation today or visit our portfolio for real-life examples of what a bump-out can achieve.

Sun Room Additions: Natural Light & Serenity in Every Season

A sun room addition is more than just an architectural enhancement—it’s a lifestyle upgrade. Designed to bring in abundant natural light, connect you with the outdoors, and offer a tranquil escape within your own home, sunrooms are among the most popular and versatile room additions today.

There are typically two types of sunrooms to consider:

Three-season sunrooms, which are best suited for spring through fall. These rooms are not usually insulated or heated, making them cost-effective for most climates.
Four-season sunrooms, which are fully insulated, include HVAC systems, and are usable year-round. These rooms function like standard living spaces and are often indistinguishable from the rest of the home.

Sunrooms can serve a variety of purposes. Some homeowners use them as reading rooms, family rooms, or even home offices. Others create yoga studios, play areas for children, or indoor gardens filled with plants that thrive in sunlight. The flexibility of this space makes it a favorite among homeowners looking to enjoy the feel of the outdoors while staying protected from weather conditions.

Key benefits of adding a sunroom include:

Increased natural light, which improves mood and enhances the ambiance of your home
Greater connection to your landscape, with panoramic outdoor views
High return on investment compared to other home addition types
Multipurpose use: entertaining, dining, relaxing, or working

Cost Range: $20,000–$70,000
Average Cost Per Sq Ft: $120–$300, depending on materials, insulation, and whether HVAC is included
Timeline: 3–8 weeks, depending on design complexity and permitting

Materials for sunrooms vary widely, from aluminum frames and glass panels to more luxurious wood framing with high-efficiency windows. Some homeowners also opt for glass room additions as a modern alternative to traditional sunrooms, combining high-end aesthetics with panoramic views.

In terms of installation, working with an experienced room addition contractor is critical. You’ll want to ensure proper insulation, seamless integration with your existing home structure, and compliance with local building codes.

You can view examples of designs that incorporate sunlight beautifully in our bathroom remodeling projects or explore a complete outdoor transformation in our deck renovation story.

Thinking of adding a sunroom that adds value and beauty year-round? Connect with our team to start designing your perfect retreat: Book an appointment

Glass Room Additions: Modern Elegance with Panoramic Views

A glass room addition is the epitome of modern design and luxury living. These additions seamlessly blur the line between indoors and outdoors, surrounding your space with walls of glass that offer uninterrupted views, abundant daylight, and a minimalist aesthetic that complements both traditional and contemporary homes.

What sets a glass room apart from a conventional sunroom is its structural design and materials. While sunrooms often use framed windows within standard wall segments, glass rooms push the boundaries with full-height, sometimes frameless glass panels. This architectural style allows for maximum light exposure and an open, airy feeling that enhances the overall spaciousness of your home.

Popular uses for glass rooms include:

Dining areas with dramatic views
Sophisticated home offices filled with daylight
Personal lounges or reading nooks
Small greenhouse-style rooms for plant lovers
Meditation or yoga rooms infused with serenity

Benefits of a glass room addition include:

Unobstructed visual connection to outdoor spaces
Boosted property value due to high-end finishes
Flexible design options with sliding, folding, or fixed glass walls
Year-round usability when built with double- or triple-glazed insulated panels

Cost Range: $25,000–$90,000
Average Cost Per Sq Ft: $130–$350
Best Placement: Backyard extensions, garden-facing facades, or as an enclosed patio

When installing a glass room, insulation and structural support are key factors. High-efficiency glass and sealed panels are essential for climate control, especially if you intend to use the space year-round. You may also need additional electrical work and HVAC integration, especially in colder regions.

A professionally designed glass room should also take into account solar gain, shading solutions, and glare reduction—elements that Fineline Kitchens Inc. considers in every project. If you’re aiming to create a space that impresses both visually and functionally, a glass room is a stunning investment.

Want to see how a modern aesthetic transforms home interiors? Explore our kitchen renovation in Bethesda, VA or browse our design portfolio for more inspirational upgrades.

20×20 Room Addition: Spacious Upgrades with Limitless Potential

A 20×20 room addition—providing a generous 400 square feet of new space—is one of the most impactful and flexible home expansions you can make. Whether you’re envisioning a primary suite, a family room, or a spacious in-law suite, this size offers ample room to create a fully functional living area that blends seamlessly with the rest of your home.

One of the biggest advantages of building a 20×20 addition is versatility. Here are some popular uses for a room of this size:

Master Suite Addition: With space for a king bed, sitting area, large bathroom, and even a walk-in closet
In-Law Suite: A private living area complete with a kitchenette, full bath, and separate entrance
Family Room: A large entertainment or gathering space for family movie nights and socializing
Home Office or Studio: Ideal for remote work setups, creative studios, or a combination office-library

Because of the scale of this type of room addition, it typically involves more than just framing and drywall. You’ll likely need:

A new foundation or slab
Extended HVAC systems
Electrical work, lighting, and possibly plumbing
Permits, architectural drawings, and engineering checks
Roofing and siding to match the existing structure

Cost Range: $30,000–$100,000
Average Cost Per Sq Ft: $150–$250
Timeline: 6–12 weeks depending on site conditions, finishes, and inspections

It’s worth noting that the home addition cost for this scale of project can vary dramatically depending on finishes, location, contractor rates, and whether you’re adding plumbing fixtures like a bathroom or kitchenette. For example, adding a bathroom within this space can increase the budget by $10,000–$20,000 depending on materials and complexity.

At Fineline Kitchens Inc., we help homeowners customize large-scale room additions with functional layouts and elegant finishes that enhance both lifestyle and value. We manage the entire process, from design to final inspection, ensuring that your 20×20 addition blends perfectly with your existing home.

Looking for inspiration? See how we transformed a tight space into a functional masterpiece in this real project. You can also book an appointment to get a tailored estimate for your home.

Room Addition Above Garage: Maximize Vertical Space Without Expanding Footprint

Building a room addition above your garage is one of the most space-efficient ways to add livable square footage without altering your home’s existing footprint. This strategy makes excellent use of previously unused vertical space and is especially ideal for properties with limited yard area or strict zoning limits on horizontal expansion.

These over-garage additions are structurally separate from your main living areas but offer easy access via a staircase. This makes them perfect for:

Guest bedrooms with ensuite bathrooms
Teen hangout spaces or game rooms
Home offices with quiet separation from household activity
Rental units or Airbnb suites (where zoning permits)
Exercise rooms, craft studios, or small home gyms

A key advantage of a garage-top addition is that the foundation and roofline already exist in some form, reducing part of the construction effort. However, significant planning and engineering may still be required. Garages aren’t always built to bear the additional load of a second story, so structural reinforcement is often the first step.

What to expect during planning:

Evaluation of garage walls, slab, and load-bearing capacity
Reinforcement of footings or foundation if necessary
Framing and integration with the existing roofline
Addition of utilities: electrical, HVAC, and possibly plumbing
Compliance with zoning laws, setbacks, and local codes

Cost Range: $50,000–$120,000
Average Cost Per Sq Ft: $150–$300
Permitting Requirements: Almost always required, especially due to height and structural considerations

The overall home addition cost depends largely on the finishes chosen and whether plumbing is required—for example, for a full bathroom or kitchenette. High-end features like skylights, built-ins, and walk-in closets can elevate both the budget and the long-term value of the space.

This type of room addition not only expands your usable square footage but also enhances privacy and property value—making it a fantastic option for growing families or those in need of a guest-friendly layout.

Fineline Kitchens Inc. specializes in complex home expansion projects like these. With our team of structural engineers, architects, and designers, we’ll guide you through each phase—from assessment to completion—ensuring the project complements your home’s existing architecture and function.

Explore our full range of home additions or contact us for a consultation and site evaluation.

Prefab Room Additions: Fast, Flexible, and Budget-Conscious Expansion

If you’re looking for a quicker, often more cost-effective way to expand your home, a prefab room addition—also known as a modular addition—might be the perfect solution. These additions are built off-site in a controlled factory environment, then transported and installed onto your property. This process not only speeds up construction but also reduces on-site labor costs and weather-related delays.

Prefab room additions are becoming increasingly popular among homeowners who want to minimize disruption while maximizing value. They’re ideal for:

In-law suites or guest houses
Detached home offices or creative studios
Rental units for passive income
Backyard gyms, playrooms, or hobby spaces
Teen or college student retreats for added independence

Unlike traditional additions, prefab units arrive partially or fully constructed and are placed on a pre-prepared foundation or pad. Once delivered, they’re connected to utilities—such as water, electrical, and HVAC—and finished according to your preferences.

Advantages of prefab additions include:

Faster installation (some in as little as 1–2 weeks)
Reduced labor costs
Less disruption to daily home life
Fixed costs with fewer unexpected expenses
High customization potential with modern modular architecture

Cost Range: $15,000–$70,000
Average Cost Per Sq Ft: $80–$200
Foundation Needs: Typically concrete slab or pier system
Utilities: Additional cost for integration, especially plumbing or HVAC

The total cost to add a prefab room depends on size, finishes, foundation work, and connection to existing home systems. Some homeowners opt for completely detached additions, while others integrate the prefab unit into their main structure.

At Fineline Kitchens Inc., we can help assess whether a modular addition is right for your home. Our expert team handles everything from initial site planning and permitting to final interior finishing, ensuring your prefab room blends beautifully with your home’s layout and aesthetics.

Looking for inspiration? Browse our project portfolio or contact us for a consultation to explore modern, modular designs tailored to your lifestyle and budget.

Room Addition Ideas for Small Homes: Creative Expansions with Big Impact

For homeowners living in small homes, maximizing available space is not just a luxury—it’s a necessity. Fortunately, you don’t need a sprawling property to benefit from a room addition. With smart design and careful planning, even compact homes can be expanded in ways that dramatically improve functionality, comfort, and style.

The key to successful additions in smaller homes is to build smarter, not necessarily bigger. Below are some of the most effective room addition ideas for small homes, each tailored to deliver the most value in a minimal footprint:

1. Bathroom Additions
Adding a small powder room or full bathroom can significantly improve daily convenience—especially in homes with only one existing bath. Whether tucked under a staircase or added as a rear bump-out, even 20-30 square feet can be transformative.

Increases resale value significantly
Great for guests or growing families
Cost-effective when placed near existing plumbing

Explore our full-service bathroom remodeling options across Fairfax, Vienna, and other Northern Virginia locations.

2. Kitchen Bump-Outs
A compact kitchen can feel crowded and outdated. A small bump-out, even just 4–6 feet, can allow for a breakfast nook, extra countertop space, or additional cabinetry.

Enhances function without major layout changes
Ideal for open-concept transitions
Costs less than a full kitchen overhaul

Check out our kitchen remodeling gallery for before-and-after examples.

3. Walk-In Closets
Storage is often lacking in smaller homes. Adding a walk-in closet off a bedroom or hallway provides a stylish and practical solution for organizing clothes, accessories, and seasonal items.

Adds luxury without much square footage
Great use of bump-out or unused corridor space
Increases home appeal for resale

4. Mudrooms or Entryways
A tiny addition at the front or rear of your home can become a highly functional mudroom—a drop zone for shoes, coats, and bags. This keeps clutter out of main living spaces and adds charm to your home’s entry.

Can double as laundry or utility space
Requires minimal structural work
Makes a big difference in everyday flow

5. Loft or Attic Conversions
Instead of building out, consider building up. Converting an attic or unused loft area into a bedroom, home office, or kids’ playroom can dramatically increase your usable space.

No change to home’s exterior footprint
Cost-effective alternative to full addition
May require electrical work and insulation upgrades

6. Sunroom for Multi-Use Space
Even a modestly sized sun room addition (around 100–150 sq ft) can serve multiple purposes—such as a breakfast space, reading area, or mini studio.

Adds natural light to the home
Extends seasonal usability
Can connect to garden or patio

7. Backyard Studio or Detached Unit
If local zoning allows, a small prefab room addition in the backyard can serve as a home office, guest room, or creative space. These units are highly flexible and often don’t require connecting to main systems.

Can be customized to fit small lots
Quick installation
High return for remote workers or side business needs

Cost Considerations for Small Additions
Even in small homes, costs vary depending on use, finish level, and structural needs. On average, you can expect:

Bathroom additions: $10,000–$25,000
Kitchen bump-outs: $15,000–$35,000
Walk-in closets: $5,000–$15,000
Prefab studio units: $20,000–$50,000

At Fineline Kitchens Inc., we’ve helped countless homeowners rethink their existing space to create impactful additions that suit their home and lifestyle. We specialize in compact, stylish solutions that deliver functionality without overwhelming the footprint.

Want to see what’s possible in your small home? Check out our project gallery or get in touch for a consultation:
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Budgeting Your Room Addition: Understanding Costs, Value, and Scope

Planning a room addition is an exciting venture—but without clear budgeting, it can quickly become overwhelming. From materials and finishes to labor and permits, many factors influence the final price of a home expansion. Whether you’re considering a modest bump-out or a full 20×20 room addition, understanding the cost ranges and decision points will help you stay on track and within budget.

Key Factors That Influence Room Addition Costs

Type of Room Addition
A basic bump-out for a kitchen or bathroom will cost significantly less than building a two-story extension with plumbing and HVAC. For instance:
- Sunroom additions: $20,000–$70,000
- Glass room additions: $25,000–$90,000
- 20×20 room additions: $30,000–$100,000
- Room above garage: $50,000–$120,000
- Prefab room additions: $15,000–$70,000
Square Footage
The cost per square foot generally ranges from $100 to $300 depending on your location, design complexity, and finish level. For basic framing and drywall, expect the lower end of the spectrum. If you’re adding luxury finishes or smart technology, costs can rise sharply.
Plumbing, HVAC, and Electrical Work
Adding a new bathroom or kitchen? You’ll need to budget for additional plumbing, water lines, venting, and drainage. The electrical work required to bring your addition up to code—lighting, outlets, switches, and panels—also adds cost. Integrating new space into your HVAC system may require ductwork and a unit upgrade.
Permits and Inspections
All room additions require local permits. Costs vary based on your municipality but generally range from $500 to $2,000. Inspections throughout the project may incur additional administrative fees, but they’re essential for ensuring code compliance and safety.
Labor Costs
Labor typically accounts for 30–50% of your overall budget. Custom carpentry, architectural features, tile installation, and painting all affect labor expenses. Choosing a reputable, experienced contractor ensures you avoid budget surprises and costly delays.
Materials and Finishes
Choices like hardwood flooring vs. laminate, standard drywall vs. custom millwork, or builder-grade fixtures vs. designer selections will directly affect pricing. Keep your style consistent with your current home to ensure a cohesive look and better resale appeal.
Location and Site Conditions
Building on flat land is simpler than dealing with a sloped lot. Accessibility, zoning restrictions, and soil conditions can all impact the complexity and therefore the home addition cost.

Sample Cost Breakdown for a 20×20 Room Addition

Component	Estimated Cost
Foundation & Framing	$12,000 – $25,000
Roofing & Siding	$6,000 – $12,000
Electrical & HVAC	$5,000 – $10,000
Drywall & Insulation	$3,000 – $7,000
Flooring & Paint	$4,000 – $9,000
Windows & Doors	$3,000 – $8,000
Permits & Inspections	$1,000 – $2,000
Total Estimate	$34,000 – $73,000

Cost-Saving Tips

Build upward instead of outward: Consider a room addition above the garage to avoid new foundation costs
Reuse existing infrastructure: Tap into current plumbing and electrical where possible
Choose standard dimensions: This reduces waste and lowers material costs
Plan during off-peak seasons: Contractors may offer better rates during winter months
Invest in energy-efficient materials: Save on utilities over time

At Fineline Kitchens Inc., we provide transparent, itemized estimates that help you plan your budget wisely. From the first sketch to the final inspection, we walk you through every step so you know exactly what to expect.

Get a precise quote tailored to your home and goals by booking a consultation:
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Choosing the Right Room Addition Contractor: What to Look for and Questions to Ask

One of the most critical decisions you’ll make in your room addition journey is selecting the right contractor. Your contractor is not just responsible for construction—they are your partner throughout the design, planning, permitting, and execution phases. Choosing wisely ensures your project stays on schedule, within budget, and free from costly mistakes.

Here’s a step-by-step guide to choosing a room addition contractor near you who will bring your vision to life with precision and professionalism.

Start with Local Research

When searching for “room addition contractors near me” or “home additions near me,” prioritize local firms that have a strong reputation and deep knowledge of your area’s zoning laws, building codes, and permit processes.

Useful platforms for reviews and comparisons include:

You can also explore completed projects and portfolios directly on company websites. For example, see Fineline Kitchens Inc.’s project gallery or home additions services.

What to Look for in a Contractor

Licensing and Insurance: Ensure they are fully licensed in your state and carry both liability and workers’ compensation insurance.
Relevant Experience: Choose a contractor with proven experience in your specific type of addition—whether it’s a sunroom, garage-top room, or bump-out.
In-House Design Services: Firms that offer both design and construction services streamline the process and reduce miscommunication.
Transparent Estimates: You should receive a detailed, itemized quote covering labor, materials, timeline, and potential contingencies.
Portfolio and References: Review their past projects and speak to previous clients to evaluate satisfaction and quality of work.
Contract Clarity: A professional contractor provides a formal contract outlining scope, payment schedule, deadlines, and warranties.

Questions to Ask Before You Hire

How many similar room additions have you completed recently?
Will I have a dedicated project manager?
What is your projected timeline for this project?
How do you handle permits and inspections?
Do you offer design services or collaborate with architects?
What is included in the contract, and what might result in additional charges?
Can I see examples of your recent work?
How do you ensure quality and compliance throughout the build?

Warning Signs to Avoid

Vague estimates or unwillingness to provide written contracts
Pressure to start quickly without clear design plans
Lack of proper insurance or licensing
No recent reviews or portfolio evidence
Poor communication or delayed responses

At Fineline Kitchens Inc., we pride ourselves on a design-build approach that keeps everything under one roof—from initial concept and budgeting to construction and final walkthrough. Our team has extensive experience with sunroom additions, glass room designs, small home expansions, and custom 20×20 room additions across Virginia.

We serve a wide range of Northern Virginia areas, including:

Want to learn more about how we approach additions? Explore our process overview or book an appointment to speak directly with our experts.

Smart Tips Before Starting Your Room Addition: Plan with Precision, Build with Confidence

Embarking on a room addition project is both exciting and complex. Whether you’re adding a sunroom, a glass room, a walk-in closet, or an entire second story, success lies in smart planning and preparation. Before the first nail is hammered, taking the time to align your goals, budget, design, and team will set you on the right path.

Here are essential tips to consider before breaking ground:

1. Define the Purpose Clearly

Start by answering a simple question: What problem are you trying to solve?

Need more sleeping space? A primary suite or guest bedroom might be ideal.
Working remotely? A dedicated home office addition could increase productivity.
Looking for a wellness escape? A sunroom or glass room offers light and relaxation.
Growing family? A family room or additional bathroom brings everyday comfort.

A clear purpose helps you prioritize what features to include—and what to avoid.

2. Set a Realistic Budget (and Add a Cushion)

After defining the type of addition, establish your budget. Research the average cost for your room type, then add an extra 10–20% contingency for unforeseen expenses.

Include all components: permits, materials, electrical work, labor, and interior finishes
Use tools or speak to a contractor for square-foot estimates (e.g., $150–$300 per sq ft)
If building a bathroom, kitchen, or laundry area, plan for additional plumbing and ventilation costs

Fineline Kitchens Inc. offers custom estimates tailored to your project size, location, and features. Book your free consultation.

3. Check Local Building Codes and Zoning Laws

Every jurisdiction has different rules regarding home expansions:

Minimum lot size requirements
Setback distances from property lines
Maximum height or square footage
Structural rules for room additions above garages or over basements

Securing proper permits and inspections is not just a legal requirement—it also protects your home’s resale value and ensures safety.

At Fineline Kitchens Inc., we handle zoning and permitting for all additions, simplifying the process for homeowners. Learn more about how we operate in our process section.

4. Choose the Right Season to Build

While construction can happen year-round, spring and fall are often the best seasons due to mild weather and contractor availability. Winter may offer better contractor pricing, but potential delays due to snow or frozen ground are possible.

Planning early allows you to secure materials, permits, and your preferred construction timeline.

5. Prepare for Disruption

Even a small addition can cause noise, dust, and temporary lifestyle changes. To minimize inconvenience:

Set up temporary cooking, bathing, or sleeping areas if your addition affects daily routines
Secure pets and plan for limited access to parts of the home
Communicate with your contractor about work hours and boundaries

A good contractor, like Fineline Kitchens Inc., will have a detailed timeline and communicate every phase with you. That’s one reason our clients recommend us.

6. Think Long-Term

Consider not just today’s needs—but also future resale value and lifestyle changes.

Will this addition still serve you in 10 years?
Are you adding universal design features for aging in place?
Would a prefab room addition or detached office offer more flexibility?

Additions that are thoughtfully designed, energy-efficient, and well-integrated with the rest of the home typically see the best return on investment.

7. Don’t Forget the Details

The difference between a good addition and a great one lies in the details:

Windows that match the existing home’s style
Flooring continuity across rooms
Consistent trim, paint colors, and rooflines
Integrated lighting, smart home features, and energy-efficient insulation

These small touches elevate your space and make it feel like a seamless part of your original home—not an afterthought.

With proper planning and the right team behind you, your room addition can dramatically enhance the comfort, beauty, and value of your home. From bump-outs and sunrooms to garage-top suites and 20×20 room additions, Fineline Kitchens Inc. has the experience and design expertise to bring your vision to life.

Let’s build something extraordinary together.
Get in touch | View our gallery | Schedule a consultation

Source Links

• SmartRemodelingLLC – How Much Does a 20×20 Room Addition Cost?
https://www.smartremodelingllc.com/blog/how-much-20×20-room-addition-cost

• Champion Windows – Sunroom Buyers Guide: How Sunrooms Differ from Traditional Additions
https://www.championwindow.com/sunroom-buyers-guide/how-sunrooms-differ-from-traditional-additions/

• JSB Home Solutions – Sunroom Addition Cost
https://www.jsbhomesolutions.com/learning-center/sunroom-addition-cost

• Studio Shed – Modular (Prefab) Room Additions
https://www.studio-shed.com/modular-addition/