Limited $0 Down · 0% Interest for 12 Months on approved projects — financing available
Sunroom Builders Serving the DMV Since 1976

A sunroom adds an entire room to your house — and turns winter into reading season.

Three-season rooms, four-season rooms, and full conservatory additions. Built like additions, finished like custom builds.

★★★★★ 4.9 · 62 Google reviews Licensed MD · VA · DC GAF · CertainTeed · Trex

Free in-home consult · Same-day quote when possible

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4.9 62 Google reviews
50 Years serving the DMV
5,000+ Projects completed
3 Jurisdictions licensed
4.9 ★ · 62 Google reviews · 5,000+ projects since 1976

What DMV homeowners say.

Our Commitment to You

Fully custom design
On time & on budget
Built by licensed professionals
Why Sunrooms Matter

You moved to the DMV for the seasons. A sunroom lets you live in them.

Six months a year, the DMV is too hot for the deck and too cold for the back porch. A sunroom is the answer — usable in February (with heat) and August (with proper glazing). It’s the closest thing to adding a room to your house without doing a full bump-out.

The difference between a great sunroom and a regretted one is the engineering: foundation, structural integration with the house, glazing choices, and HVAC integration. A sunroom built as an add-on porch fails — gets cold in winter, hot in summer, has condensation problems.

A sunroom built as an addition — proper foundation, real walls, integrated HVAC — becomes the most-used room in the house.

You moved to the DMV for the seasons. A sunroom lets you live in them.
Your Options

Sunrooms systems we install.

We install only what we'd put in our own homes. Here's what each option is best at.

Three-Season Rooms

Three-Season Rooms

Eze-Breeze or vinyl glazing, no heating system. Usable spring through fall.

Best for
Budget-conscious additions, spring/fall enjoyment
Typical range
$30K – $60K
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Four-Season Rooms

Four-Season Rooms

Insulated glass, heat + AC, finished interior. Year-round usable.

Best for
Year-round additional living space
Typical range
$65K – $130K
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Conservatory Additions

Conservatory Additions

Full glass walls + glass roof. Architectural showpiece.

Best for
Premium aesthetic, light-driven design
Typical range
$100K – $200K+
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Screened Conversion

Screened Conversion

Convert existing screened porch to three-season or four-season room.

Best for
Existing porch upgrade
Typical range
$20K – $50K
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Trusted Manufacturer Partners

Brands we install

We install premium, warranty-backed products from the industry's most trusted names.

ScreenEze — installed by Four Seasons
HB&G — installed by Four Seasons
AZEK — installed by Four Seasons
Honest Pricing

What a DMV sunroom costs.

Ranges based on the last 30+ sunroom projects we've completed in MD, DC, and VA.

$30K – $60K
Three-season room
200-300 sq ft addition with vinyl glazing and uninsulated walls
$65K – $130K
Four-season addition
Same size with insulated walls, dual-pane glass, HVAC integration
$100K – $200K+
Conservatory
Full glass walls and roof; premium aesthetic

What changes the number for your home

  • Three vs. four-season. Three-season is roughly half the cost of four-season per sqft
  • Foundation. Slab vs. crawlspace vs. full basement underneath
  • HVAC integration. Extending existing system vs. dedicated mini-split — affects sizing and cost
  • Glazing. Single-pane < dual-pane Low-E < triple-pane; depends on season-rating
  • Roof structure. Solid roof, glass roof, or hybrid; matching house pitch and roofing
  • Flooring. Tile, hardwood, polished concrete; in-floor heating optional
  • Electrical. Outlets, ceiling fans, recessed lights, separate circuit
  • Permits. Major addition — full permitting and structural inspection required
How It Works

A sunroom built like an addition, finished like custom.

01

Free design consult

We walk the space, discuss intended use (three-season vs. four-season), and sketch options that integrate with the existing house.

02

Architectural plans + permits

CAD plans, structural drawings, energy calcs, and permitting package. We handle HOA approval if needed.

03

Construction (6-10 weeks)

Foundation, framing, roofing, exterior finish, windows, HVAC integration, electrical, interior finish.

04

Final inspection + warranty

Code inspection, written workmanship warranty. We pick up the phone after.

Why Four Seasons

Most sunroom contractors sell the kits. We build them like real rooms.

Proper foundation, structural roof tie-in, real HVAC integration — the difference between a great sunroom and a regretted one.

Real foundation

Frost-depth footings, full slab or crawlspace, code-compliant tie-in to existing house foundation. Not "porch piers under a fancier roof."

HVAC integration

We extend your existing HVAC properly or add mini-splits with proper sizing. Real conditioning, not a space heater.

Energy-rated glazing

Dual-pane Low-E glass with argon fill on four-season rooms. Cuts solar heat gain and cold transfer.

50 years in the DMV

Same family. Second generation. We've built sunrooms on every house style this region has produced.

Triple-licensed

MHIC #129630 (MD), VA #2705082387A, DC #420224000125.

Flexible financing

$0 down, 0% interest for 12 months on approved sunroom projects.

Where We Work

Sunroom construction across the DMV.

Maryland, Washington DC, and Northern Virginia. Free design consults scheduled within 48 hours.

Call (301) 948-2678 Get Free Quote
  • Rockville, MD
  • Bethesda, MD
  • Silver Spring, MD
  • Gaithersburg, MD
  • Potomac, MD
  • Frederick, MD
  • Annapolis, MD
  • Hyattsville, MD
  • Laurel, MD
  • Greenbelt, MD
  • Columbia, MD
  • Towson, MD
  • Arlington, VA
  • Alexandria, VA
  • Fairfax, VA
  • McLean, VA
  • Loudoun County, VA
  • Prince William County, VA
  • Ashburn, VA
  • Leesburg, VA
  • Washington, DC
  • Capitol Hill
  • Georgetown
  • Cleveland Park
Common Questions

Sunroom questions DMV homeowners ask.

How much does a sunroom cost in the DMV?

Three-season rooms run $30,000-$60,000. Four-season rooms with full HVAC integration run $65,000-$130,000. Glass conservatory additions run $100,000-$200,000+.

What's the difference between three-season and four-season?

Three-season: single-pane or vinyl glazing, no heating system, uninsulated walls. Usable roughly April-November. Four-season: insulated walls, dual-pane Low-E glass, HVAC integration. Year-round usable, holds heat in February.

How long does a sunroom build take?

Three-season: 4-6 weeks construction. Four-season: 6-10 weeks. Conservatory builds with custom glass: 10-14 weeks. Add 4-6 weeks for permits + design upfront.

Do I need a permit for a sunroom?

Yes — sunrooms are additions and require full permitting in all DMV jurisdictions. We handle application, plans, structural drawings, energy calcs, and inspections.

Can you extend my existing HVAC?

Sometimes — depends on your existing system's capacity. We do a load calculation. If extending isn't feasible we install a dedicated mini-split — actually a better solution for most sunrooms.

What about the roof?

We match your existing house roof pitch and shingles, OR install standing-seam metal for a modern look, OR install a glass roof for the conservatory experience. We discuss at design.

Will my HOA approve it?

We handle HOA submittals. Most DMV HOAs approve well-designed sunrooms that match the house. Architectural review boards focus on materials, colors, and roof pitch — all things we plan in the design.

Do you offer financing?

Yes. $0 down, 0% interest for 12 months on approved sunroom projects. Larger projects also qualify for extended-term plans.

Free in-home estimates · Most quotes scheduled within 24 hours

Let's design your sunroom.

Free design consult. We walk the space, sketch options, and talk through three-season vs. four-season tradeoffs.

Call (301) 948-2678 hello@4seasonshome.com
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Same-day response.

We'll text you within minutes to confirm details and schedule.

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