How much does a sunroom cost?
Ashburn, VA

How much does a sunroom cost?

Ashburn, VA

How much does a sunroom cost?

$100 – $350cost per square foot to build
$8,000 – $50,0003-season room cost
$20,000 – $80,0004-season sunroom cost

Get free estimates for your project or view our cost guide below:

$100 – $350 cost per square foot to build

$8,000 – $50,000 3-season room cost

$20,000 – $80,000 4-season sunroom cost

Get free estimates for your project or view our cost guide below:
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Sarah Noel
Written by
Sarah Noel
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Average sunroom cost

A sunroom costs $100 to $350 per square foot on average. A 3-season room costs $8,000 to $50,000 to build, and a 4-season room costs $20,000 to $80,000 to add. A sun porch or prefab sunroom addition costs $5,000 to $30,000, and a glass solarium costs $30,000 to $150,000.

Connect with home addition contractors near you for a personal estimate or view the average sunroom sizes and prices below.

Sunroom Cost
Size 3-Season 4-Season
8x10 $6,500 – $18,500 $16,000 – $28,000
10x10 $8,000 – $23,000 $20,000 – $35,000
10x12 $9,500 – $27,500 $24,000 – $42,000
10x16 $12,500 – $37,000 $32,000 – $56,000
10x20 $16,000 – $46,000 $40,000 – $66,000
12x12 $11,500 – $33,000 $28,500 – $47,500
12x16 $15,500 – $45,000 $38,500 – $63,500
12x20 $19,000 – $55,000 $48,000 – $79,000
14x14 $15,500 – $45,000 $39,000 – $65,000
16x16 $20,000 – $60,000 $50,000 – $80,000
16x24 $30,000 – $85,000 $75,000 – $120,000
20x20 $32,000 – $90,000 $80,000 – $124,000

  • An all-season or 4-season room integrates into the existing construction of the home with insulation, electricity, and an HVAC system.

  • Three-season sunrooms are additions enclosed with glass but lacking insulation and HVAC systems.

  • A sunroom adds extra living space, increases a home's appraisal value, adds curb appeal, and yields a 50%+ return on investment.

  • The most popular sunroom sizes are 12'x12' and 16'x24'.

Get free estimates from sunroom contractors near you.

Sunroom addition cost per square foot

A sunroom addition costs $100 to $350 per square foot installed on average. The cost to add a 3-season room is $80 to $230 per square foot, and a custom-built 4-season sunroom runs $200 to $400 per square foot.

Sunroom cost per square foot - chart
Sunroom cost per square foot - chart
Sunroom cost per square foot
Type Cost Per Square Foot
Prefab sunroom kit $20 – $150
Custom 3-Season room $80 – $230
Custom 4-Season room $200 – $400

Cost to build a sunroom by type

The costs to build a sunroom depend on the size, type, quality, finishes, and if it's custom-built or prefabricated.

Cost to build a sunroom by type
Type Average Cost Description
Prefab Sunroom Kits $1,500 – $8,000 Prefab kits are premade, delivered, and assembled on an existing deck or patio.
Greenhouse / Garden Room $3,000 – $25,000 Typically prefab kits with glass or plastic panels. Lack a foundation and insulation.
Enclosed Patio / Screened-in Porch $8,000 – $30,000 Built on top of an existing deck or patio. Typically no insulation, HVAC, or electrical.
Prefabricated Sunroom $5,000 – $50,000 High-end prefab sunroom from name-brand dealers. Higher quality materials, insulated panels, customizations. 3 or 4-season models.
3-Season Room $15,000 – $50,000 Custom built on a foundation. Insulated and sealed, but typically lacks HVAC and electricity. Lights and HVAC can be installed separately.
4-Season Room $20,000 – $80,000 Custom built on a foundation with insulation, electricity, HVAC, and glass windows. Provides an extension of living area.
Solarium / Conservatory $30,000 – $150,000 Custom-built glass solarium or conservatory is a high-end 4-season room with all glass walls and glass ceiling.

Get free estimates from sunroom contractors.

Four-season room cost

A four-season sunroom costs $200 to $400 per square foot or from $20,000 to $80,000 to add on average, depending on the size, materials, and foundation. A four-season room is temperature-controlled with insulation and connects to the rest of the house.

Four-season room cost - chart
Four-season room cost - chart
4-Season Room Cost
Type Average Cost
Standard $20,000 – $80,000
Solarium / Conservatory $50,000 – $150,000

4-season room living space blended with french patio doors
4-season room living space blended with french patio doors

Three-season room cost

A 3-season room costs $8,000 to $50,000 on average, depending on the size, finishing options, and foundation. Building a three-season room addition costs $80 to $230 per square foot. Three-season sunrooms typically lack insulation, heating, cooling, and electricity.

Three-season room cost - chart
Three-season room cost - chart
3-Season Room Cost
Type Average Cost
Prefab Kits $1,500 – $8,000
Pool Enclosure $4,000 – $50,000
Patio Enclosure $8,000 – $30,000
Custom Site-built $15,000 – $50,000

Three-season room installed with electricity
Three-season room installed with electricity

Solarium cost

A solarium costs $30,000 to $100,000 on average, depending on the size and whether it's a 3-season or 4-season extension. Building a solarium addition costs $300 and $800 per square foot. A solarium has glass walls and roofing.

Solarium cost - chart
Solarium cost - chart
Solarium Cost
Type Average Cost
3-Season $30,000 – $60,000
4-Season $50,000 – $100,000

High-end solarium addition with glass roof and walls
High-end solarium addition with glass roof and walls

Conservatory addition cost

A home conservatory addition costs $50,000 to $150,000 total or $200 and $600 per square foot installed. High-end residential or commercial conservatories cost $600 to $1,200 per square foot to build.

Conservatory Addition Cost
Type Cost Per Square Foot
Average $200 – $600
High-end $600 – $1,200

A conservatory is a deluxe sunroom with a foundation, insulation, electricity, HVAC, and glass ceilings. The roof panels are angled to form a central peak that bisects the structure.

Large house conservatory built with hinged windows and glass roof
Large house conservatory built with hinged windows and glass roof

Greenhouse & garden room cost

A greenhouse or garden-room addition costs $2,000 to $30,000 on average. Prefab garden room kits cost $10 to $25 per square foot and are available with glass or plastic panels. Greenhouses traditionally lack a foundation and insulation.

Garden Room Addition Cost
Type Average Cost
Small Prefab Kit $600 – $3,000
Mid-size Freestanding / Lean-to $3,000 – $12,000
Greenhouse w/ Glass Panels $10,000 – $25,000
Custom Built $30,000+

Greenhouse and garden room addition connected to home
Greenhouse and garden room addition connected to home

Glass-atrium sunroom addition cost

An atrium is an open interior room with a glass roof. A glass atrium addition costs $6,000 to $20,000 for the roof, which requires structural modifications and HVAC work. Contractors must review the blueprints and site with an engineer to provide an accurate quote.

Four-season sunroom addition with glass atrium
Four-season sunroom addition with glass atrium
Get free estimates from sunroom companies near you.

Sunroom addition cost calculator

Sunroom costs increase as more features are added. States like New York, New Jersey, Massachusetts, Florida, or California have higher costs of living that raise sunroom prices by up to 50%.

Sunroom Addition Cost Breakdown
Type Materials Labor Total Cost
Three-Season Room $5,000 – $35,000 $3,000 – $15,000 $8,000 – $50,000
Four-Season Room $15,000 – $60,000 $10,000 – $20,000 $25,000 – $80,000
Glass Solarium $20,000 – $70,000 $10,000 – $30,000 $30,000 – $100,000
Conservatory $35,000 – $100,000 $15,000 – $50,000 $50,000 – $150,000
Greenhouse / Garden Room $2,500 – $10,000 $500 – $2,500 $3,000 – $12,500

Sunroom construction costs

Labor includes foundation work, parts assembly, insulation, electricity, HVAC, and finishing work to meet building codes.

Sunroom Construction Costs
Item Average Cost
Foundation $1,000 – $6,000
Insulation $300 – $1,500
Roof $500 – $7,000
Windows $3,500 – $12,000
Doors $700 – $2,400
Electricity $250 – $600
HVAC $300 – $5,000
Interior Finishing $500 – $5,000
Site Cleanup $300 – $700
Permits $200 – $500

  • Planning & design – Hiring an architect costs 5% to 20% of the total construction cost to design the structure.

  • Site preparation – Additional costs apply when building a new foundation such as land clearing, tree removal, excavation, and landscaping.

  • Site cleanup – Construction-site cleaning costs $300 to $700 on average.

  • Permits – A building permit for a sunroom costs $200 to $500 and are required. Also, a zoning permit, electrical permit, and a heating-cooling permit may be required.

Sunroom foundation cost

A sunroom foundation costs $1,000 to $6,000 or $5 to $15 per square foot on average. Site-built sunrooms require a proper building foundation, while prefab sunroom kits can attach to an existing wooden deck or patio with a level surface.

Sunroom Foundation Cost
Type Cost Per Square Foot
Concrete Slab Costs $5 – $10
Pier and Beam $7 – $11
Crawl Space $7 – $14
Paver Patio Costs $10 – $17
New Deck Costs $15 – $30

Sunroom frame material

Sunroom framing is typically aluminum, vinyl, wood, or resin plastic. Three-season sunrooms have cheaper frames such as aluminum, resin, and vinyl. Higher-quality 4-season sunrooms and conservatories are built with expensive wooden or insulated vinyl framing.

Sunroom insulation estimates

Sunroom insulation costs $300 to $1,500 or $1 to $4 per square foot. Other insulation options are curtains, insulated panels, dual-pane windows, sub-deck protection, and sealing joints. A screen room or three-season sunroom doesn’t require insulation.

Sunroom roof cost

A sunroom roof costs $500 to $7,000, depending on the material. A glass solarium roof with a steel structure costs the most, while an asphalt, metal, or slate-covered roof costs between $500 and $3,500. Adding a skylight costs $1,600 to $4,200 each.

Sunroom Roof Cost
Type Average Cost
Asphalt $500 – $1,000
Metal $1,200 – $2,400
Slate / Clay $2,200 – $4,500
Glass $3,000 – $7,000
Skylights $300 – $3,000

*Based on the average sunroom size of 150 to 300 square feet.

Sunroom windows cost

Sunroom windows cost $3,500 to $12,000 on average for 10 new or replacement windows. Non-insulated windows for a three-season sunroom are cheaper than dual-pane insulated windows for a four-season room or solarium. Other options are plastic film, plastic windows, or screens.

Sunroom Windows Cost
Type Average Cost Per Window
Single-Pane $290 – $460
Double-Pane $450 – $1,000
Triple-Pane $600 – $1,300
Casement / Awning $200 – $1,500
Sliding $250 – $1,000
Bay / Bow $1,500 – $5,000
Fixed / Picture $180 – $1,000

Sunroom doors prices

Installing French or sliding glass doors costs $700 to $2,400 and can replace walls, provide natural light, and provide stunning outside views. Other options include patio doors, single-entry, telescoping, or bi-fold doors:

Sunroom Doors Cost
Type Average Cost
Single-Entry $380 – $1,800
Sliding Glass $700 – $2,400
French $700 – $1,800
Bi-Fold $3,000 – $12,000

Sunroom lighting and electrical costs

Hiring an electrician costs $40 to $100 per hour, plus a $75 call-out fee on average. Expect to spend a total of $250 to $600 or more to install the wiring for an average sunroom. Other potential costs include:

Sunroom Electrical Installation Cost
Addition Average Cost
Install Light Fixture $135 – $415
Install Outlet $120 – $275
Install Ceiling Fan Costs $150 – $350
Install Electrical Switch $150 – $250
Upgrade Electrical Panel Costs $850 – $1,700
Electrical Wiring Installation Costs $6 – $10 per linear foot

Good to know: Most 3-season sunrooms don’t have electrical connections, but some prefabricated units come with built-in electrical components.

Sunroom heating & air conditioning costs (HVAC)

Adding or expanding the HVAC system costs $300 to $5,000 to bring heating and cooling into the sunroom. Installing a mini-split AC unit costs $2,000 to $6,000, which provides both heating and cooling without ducts.

Sunroom Heating & Air Conditioning Costs
Type Average Cost
Extend Existing Ductwork $10 – $20 per linear foot
Window AC Unit $250 – $700
Space Heater $50 – $300
Baseboard Heaters $300 – $800
Ductless Mini-Split System $2,000 – $6,000

Sunroom interior finishing costs

After building the sunroom, extra costs of $4 to $50 per square foot apply for painting, flooring, shutters or blinds, interior design and decor, and other interior finishes.

Sunroom Interior Finishing Costs
Finishing Cost Per Square Foot
Painting Costs $2 – $4
Interior Designer Costs $5 – $12
Flooring Installation Costs $2 – $15
Radiant Floor Heating Costs $6 – $15
Blinds Cost $3 – $7
Plantation Shutters Cost $20 – $45

Get free estimates from sunroom contractors near you.
Get free estimates from sunroom contractors.

Cost to convert a deck, porch, or patio to a sunroom

Converting a deck, porch, or patio into a sunroom costs $4,000 to $70,000, depending on the size and features. A 3-season sunroom, also called a "patio enclosure" or screened-in porch, is cheapest. A 4-season sunroom costs the same as a home addition.

Cost to convert to sunroom - chart
Cost to convert to sunroom - chart
Cost To Convert Deck, Porch, or Patio to Sunroom
Conversion Average Cost
Deck or Patio into Sunroom $8,000 – $30,000
3-Season Room To 4-Season $3,000 – $20,000
3-Season Room To Living Space $20,000 – $80,000
Screened Porch To Sunroom $4,000 – $20,000

Convert deck or patio into sunroom cost

Cost to convert 3-season room to 4-season

Converting a 3-season room into a 4-season costs $3,000 to $20,000, which may include new windows, insulation, HVAC extension, and pouring a concrete foundation. Converting a 3-season room into a regular room or living space addition costs $20,000 to $80,000 or $100 to $300 per square foot.

Alternatively, finishing a basement costs around the same.

Converting screened porch to sunroom cost

Converting a screened porch into a sunroom costs $4,000 to $20,000 or $200 and $400 per linear foot. Additional costs apply for pouring a slab foundation and bringing the sunroom up to building code standards.

Converting Screened Porch To Sunroom Cost
Type Average Cost
Convert To 3-Season $4,000 – $10,000
Convert To 4-Season $10,000 – $20,000

*Extra costs may apply for permits, insulation, and extending the HVAC system.

  • Replacing the screens with glass picture windows costs $400 to $800 per window, which includes a stronger frame with more insulation.

  • Installing new window panes costs $150 to $400 each if the current window frames are in good shape.

Prefab sunroom kit prices

Prefabricated sunroom kits cost $20 to $150 per square foot on average or $10,000 to $50,000 installed, depending on the size, brand, model, and if it's a 3-season or 4-season room. Sunroom delivery, foundation, and labor costs $2,500 to $5,000 alone.

Average prefab sunroom kit prices - chart
Average prefab sunroom kit prices - chart

Prefab sunrooms are built in a factory and then shipped to your home for assembly. After acquiring building permits, prefab sunrooms can be installed on top of a patio slab and sometimes on a wooden deck.

All glass prefab sunroom kit installed
All glass prefab sunroom kit installed

Low-end DIY sunroom kits cost $1,500 to $5,000 on average. Shipping costs up to $500. Most DIY sunroom kits are 3-season with a 5-year warranty. Installing a DIY sunroom takes two people 1 to 2 days. You'll also need a level surface or a deck prepared beforehand.

Sunroom kit prices by brand

Prefab Sunroom Prices By Brand
Brand Average Cost
Champion Sunrooms $15,000 – $45,000
California Sunrooms $5,000 – $20,000
Florian Sunrooms $16,950 – $30,000
Brady Built Sunrooms $12,000 – $20,000
Sunspace Sunrooms $10,000 – $50,000
Patriot Sunrooms $10,000 – $35,000
SunSuites Sunrooms $40,000+

Some prefab sunroom kits are suitable for DIY assembly, but most require hiring a professional to keep the warranty in place and to pass local inspections.

Champion sunrooms cost

Champion Sunrooms cost $25,000 to $45,000 or between $160 and $260 per square foot on average for their custom 4-season style rooms. Champion 3-season patio rooms cost $15,000 and up, depending on the design choices. Champion has a limited lifetime warranty on parts, materials, and labor.

Get free estimates from sunroom contractors near you.

Patriot sunrooms cost

Patriot Sunrooms cost $10,000 to $35,000 on average, with styles including straight-eave, curved, cathedral, and conservatory. Patriot offers free design consultations, affordable financing, and transferable labor and material warranties.

Pros & cons of sunrooms

The many benefits of a sunroom often outweigh the disadvantages:

Benefits of a sunroom

  • Adds extra living space for relaxation, entertainment, or exercise

  • Provides natural sunlight and open views to the outside year-round

  • Costs less than a traditional home addition and constructs faster

  • Increases your home's appraisal value and has a 50%+ return on investment

  • Increases your home’s curb appeal to sell faster

  • Brings natural light and free heating into your home

  • Serves as an indoor garden to grow plants

Disadvantages of sunrooms

  • Increased property taxes due to the added square footage

  • Possible increase in home’s insurance rates

  • Increased energy bills for heating and cooling 4-season rooms

  • Less privacy due to the surrounding glass walls

  • Unusable during the winter when unheated

Sunroom FAQs

Does a sunroom add value to your home?

Sunrooms have a 47% to 55% return on investment. Most three-season rooms are appraised as low as 25% of living space value on a per-square-foot basis. Four-season sunrooms with livable space are valued at the home's normal $/sqft.

How much does a two-story sunroom cost?

A two-story sunroom addition costs $30,000 to $150,000 or between $100 and $300 per square foot to build. A two-story sunroom is priced similarly to a full home addition and requires a stronger foundation with higher-quality building materials than basic sunrooms.

Does adding a sunroom increase taxes?

A 4-season sunroom increases your property taxes by adding square footage to your home, which raises the property value. Many screen rooms or 3-season sunrooms are considered a non-habitable backyard patio with lower tax rates.

How long does it take to build a sunroom?

A prefab sunroom kit takes 1 to 2 weeks to build. A custom-built sunroom takes 2 months or more to build.

Prefab vs. Custom Sunroom Installation Cost
Type Installation Time Average Cost
Prefabricated 1 to 2 weeks $5,000 – $50,000
Custom-Built 2 months or more $30,000 – $90,000

*Additional costs may apply for shipping, assembly, and site-work.

Can I build a sunroom DIY?

Sunrooms are not an easy DIY project. Before buying a prefabricated kit, get free estimates from sunroom contractors to compare.

  • Contractor-built sunrooms last longer and require fewer repairs over time.

  • Contractors offer a bigger selection of models and higher-quality materials.

  • Only contractors build four-season sunrooms with electrical and plumbing.

  • Contractors provide a warranty on labor.

  • Contractors take care of permits and property inspections.

How to build a sunroom on a budget

Here's how to save money when planning your sunroom budget:

  • Select a 3-season sunroom model without insulation, heating or cooling.

  • Keep the overall size small.

  • Add a portable electric heater or fireplace in colder weather.

  • Spend extra on insulation to save money through energy-efficiency.

  • Place the sunroom on the Southern side of your home to catch the most sunlight in winter.

Hiring a sunroom contractor

Before hiring a home addition contractor near you, be sure to:

  • Get at least three in-person estimates.

  • Visit local showrooms to compare models and sizes.

  • Do the research and determine what kind of flooring, windows, roofing, and paint.

  • Ask for recommendations from family, friends, and neighbors.

  • Read reviews and check out their previous work on HomeGuide and Google.

  • Ask for a full itemized contract in writing in case of a dispute.

  • Make sure your sunroom comes with a service and manufacturer’s warranty for at least several years.

  • Avoid making large payments upfront.

Questions to ask

  • How long have you been in business?

  • Can I see a portfolio of your past sunroom projects?

  • Are you licensed, insured, and bonded?

  • Are you a member of local or national home builders associations?

  • Do you use materials approved by the AAMA, IGCC, or NSA?

  • What permits do I need, and will you obtain them?

  • How do you handle damages that happen on the job?

  • What happens if I'm not satisfied with the work?

  • Is cleanup included in your quote?

  • Who's the project manager, and will you use subcontractors?

  • What hours do you and your crew work?

  • What warranties and guarantees are included?

  • What’s your payment schedule?