Sunroom Cost Breakdown: What You’ll Pay in Texas (2026)

If you’re pricing a sunroom in Texas in 2026, expect the quotes to come back wildly different. $18,000 from one builder. $55,000 from another. $90,000+ from a third. All for what sounds like “the same thing.”

The reason is simple: “sunroom” covers at least three different products, each built to a different standard. A three-season screen room with a sun-shade roof is a different animal from a four-season insulated glass room with full HVAC. Both get called “sunrooms” in casual conversation.

This guide breaks down what each type actually costs in Texas, where the hidden line items hide, and the red flags in low quotes — so when you compare numbers, you’re comparing the same product.

2026 Texas Sunroom Cost Ranges

Here’s the honest range by sunroom type on the Texas Gulf Coast:

• Screen room / three-season (open to air through screen): $15,000–$35,000. Aluminum frame, screen walls, roof with no insulation. Not climate-controlled. Great for spring and fall, limited use July–August.
• Three-season glass room: $25,000–$55,000. Aluminum frame, single-pane glass walls, uninsulated or lightly insulated roof. Fan-cooled in summer, usable most of the year except peak heat.
• Four-season sunroom (full climate control): $40,000–$90,000+. Aluminum frame, dual-pane insulated glass, insulated roof, dedicated HVAC. Year-round room, treated like interior space.
• Custom conservatory or glass addition: $75,000–$150,000+. Full architectural glass addition tied to the home’s HVAC and foundation. Comparable to any room addition.

Per-square-foot math: three-season sunrooms land around $150–$300/sq ft. Four-season sunrooms run $300–$500+/sq ft. Below those ranges, something is being cut — usually the glass grade, the roof insulation, or the engineering. For context on how the same engineering and material standards apply to pool screen enclosures, we have a related guide.

Size and Shape: How Footprint Changes the Math

Sunrooms don’t scale linearly. A 10’×12′ sunroom (120 sq ft) doesn’t cost half of a 12’×20′ sunroom (240 sq ft) — it typically costs more like 60–65% of it, because fixed costs (permit, engineering, HVAC tie-in, foundation prep) don’t scale with square footage.

Common Gulf Coast sunroom sizes and typical all-in cost ranges:

• 10’×12′ (120 sq ft) — small sunroom, dining or reading space: $22,000–$55,000 depending on type
• 12’×16′ (192 sq ft) — mid-size, dining + sitting: $32,000–$75,000
• 14’×20′ (280 sq ft) — large, full living space: $45,000–$110,000+
• 16’×24′ (384 sq ft) — oversized, dual-purpose: $65,000–$150,000+

Shape matters too. A rectangular sunroom is the lowest cost per square foot. L-shaped, bay-window, or multi-sided sunrooms add corners, which add framing, flashing, and engineering complexity.

Foundation: Slab, Deck, or Existing Patio

What’s under the sunroom is the single biggest hidden line item in a quote.

New concrete slab (most common). Standard 4″ slab with post-tensioning on Gulf Coast expansive soils runs $8–$15 per square foot — so $1,500–$3,000 for a small sunroom slab, $3,000–$6,000 for mid-size. Soils in Brazoria and Galveston counties often require more prep than quotes assume.

Existing concrete patio. Can save $2,000–$6,000 if the slab is sound. Must be inspected: crack-free, correctly thick (minimum 4″), properly reinforced, and able to carry the structural load. An old thin patio under a four-season room is a disaster waiting to happen.

Existing wood deck. Rarely a good foundation for a four-season sunroom. Wood decks move with moisture; sunroom frames don’t. Deck-mounted sunrooms are usually three-season only, and even then the deck has to be rebuilt to current code for live load.

Pier and beam. For hillside lots or where soil won’t support a slab. Adds $3,000–$8,000 over slab cost but necessary for some League City, Clear Lake, and bayside sites.

Honest quotes line-item the foundation. If a quote doesn’t name what’s under the sunroom, it’s either reusing an existing slab (ask them to prove it’s rated for the load) or hasn’t been fully priced.

Permits, HOA, and Engineering on the Gulf Coast

If you’re anywhere in the Texas Department of Insurance (TDI) windstorm catastrophe area, a sunroom needs engineer-sealed plans drawn to your exact address. That area covers:

• All of Brazoria County (Angleton, Lake Jackson, Pearland, Alvin, Manvel)
• All of Galveston County (League City, Friendswood, Dickinson, Webster, Clear Lake Shores, Kemah, Seabrook)
• Parts of Harris County east of Hwy 146 (La Porte, Morgan’s Point, Pasadena, Seabrook, Shoreacres)
• All 14 first-tier coastal counties statewide

Engineering adds $800–$2,000 to the project. In exchange, you get wind-rated plans, a build that passes TDI inspection the first time, and a WPI-8 windstorm certificate that insurance carriers accept.

HOA review is a separate layer. Master-planned communities in Houston, Pearland, and League City typically require architectural committee approval. The packet usually needs a site plan, elevations, color selections, roof pitch, and sometimes neighbor sign-offs. A good contractor assembles this packet as part of the project — not after the quote is signed.

City permits are their own line item. Most Gulf Coast cities charge $200–$600 for a sunroom permit. The permit filing uses the engineer-sealed plans.

Red Flags in Sunroom Quotes Under $15,000

A legitimate built-to-code sunroom on the Texas Gulf Coast is unlikely to come in under $15,000. If you’re seeing a quote that low, something above is being skipped. Here’s what to check:

• No engineering line. A sunroom without engineer-sealed plans won’t pass TDI inspection and may not be insurable.
• Builder-grade aluminum. The structural standard for Gulf Coast builds is 6061-T6 or 6063-T6. Builder-grade will corrode in salt air within a few years.
• Galvanized fasteners. Stainless is the Gulf Coast standard. Galvanized rusts, and rust-stained aluminum frames are a resale killer.
• Single-pane glass billed as “four-season.” A four-season room needs dual-pane insulated glass. Single-pane won’t hold climate control economically.
• No HVAC spec. A four-season sunroom either taps the home’s HVAC or has a mini-split. “We’ll figure out AC later” means you’ll pay $4,000–$8,000 extra later.
• Lifetime warranty on everything. SHD offers limited lifetime on the aluminum frame and 5 years on labor. Any contractor claiming “lifetime warranty” on labor is making a claim that doesn’t survive the first service call.

What SHD Builds (and What’s Included)

Simmons Home Design builds Gulf Coast sunrooms with:

• Engineer-sealed plans for your exact address, filed with your city permit office
• Structural 6061-T6 or 6063-T6 aluminum framing
• Stainless steel fasteners (galvanized rusts near salt air)
• Your choice of three-season (screen or single-pane glass) or four-season (insulated dual-pane glass, insulated roof, dedicated HVAC spec)
• Foundation design and prep matched to your site’s soil
• HOA packet preparation when your neighborhood requires architectural review
• Line-itemed quotes — foundation, framing, glass or screen, roof, electrical, HVAC separately
• 5-year labor and workmanship warranty, limited lifetime frame warranty

Build time from signed contract to final inspection: typically 4 to 8 weeks for three-season sunrooms, 6 to 10 weeks for four-season (HVAC tie-in extends the schedule).

What Our Houston & Gulf Coast Customers Say

 
 
 
 
 
 
 
  
 
 
 
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 Bob Crosby 
 
 
 
 Trustindex verifies that the original source of the review is Google. 
They just finished turning our back porch into a sunroom. We first tried a national chain that offers "Four Season" rooms, but they did not understand the hurricane requirements here in the city of Seabrook. Going with a local builder is the right choice.
  
 
  
 
 
 
 Posted on Google  
 
  
 
 
 Bridgett Morales 
 
 
 
 Trustindex verifies that the original source of the review is Google. 
It seems insane that we should be outside in the Texas heat without some sort of coverage or shade. That’s why I am so grateful that I found.Simmons Home Design. They work with their customers to design the best solutions based on our needs and space available. They will help get everything approved with your HOA too. We’re in the north part of Harris County and they have no problem servicing our area. Highly recommend!
  
 
  
 
 
 
 Posted on Google  
 
  
 
 
 Bridge The Gap 
 
 
 
 Trustindex verifies that the original source of the review is Google. 
We couldn’t be happier with our new custom pool enclosure from Simmons Home Design. Living in Clear Lake, we deal with mosquitoes, leaves, and salt air — but this enclosure solved all of that instantly. Wayne’s team is extremely knowledgeable about coastal construction and helped us choose the right materials for longevity. The install crew showed up early every day, worked quickly, and left our yard spotless. What impressed me most was the communication — texts, photos, updates, everything. You can tell they take real pride in their product and reputation. This is the kind of company you recommend to neighbors.
  
 
  
 
 
 
 Posted on Google  
 
  
 
 
 Michael Ripple 
 
 
 
 Trustindex verifies that the original source of the review is Google. 
We hired Simmons Home Design for a full Eze-Breeze patio enclosure in League City, and I can’t say enough good things. The quality of the insulated aluminum panels and screening is top-tier and has already made a huge difference in heat and noise control. Wayne walked the property with us, explained every detail, and gave us a fair, honest quote with no surprises. The install crew was respectful, clean, and efficient. Our backyard now feels like an extra room added to the house. After dealing with several contractors over the years, Simmons is by far the most reliable. Highly recommend for anyone looking for a durable, long-lasting enclosure.”
  
 
  
 
 
 
 Posted on Google  
 
  
 
 
 Kyle Roebuck 
 
 
 
 Trustindex verifies that the original source of the review is Google. 
We couldn't be happier with our new open-view pool enclosure from Simmons Home Design! From the initial consultation to the final installation, Wayne and his team were professional, knowledgeable, and easy to work with.

One of the things we loved most was how the enclosure protects our pool from leaves, debris, and insects without blocking our view. The open-view design makes the enclosure almost disappear, allowing us to enjoy the beauty of our backyard while adding protection and functionality to our pool area.

The quality of the workmanship is outstanding, and the finished project looks like it was always meant to be part of our home. The crew paid attention to details, kept the work area clean, and completed the project exactly as promised.

We spend much more time around our pool now and have already noticed a reduction in maintenance and cleanup. If you're considering a pool enclosure in the La Porte area, we highly recommend Simmons Home Design. Their professionalism, craftsmanship, and customer service exceeded our expectations.

Thank you, Wayne and the Simmons Home Design team, for creating a beautiful outdoor space our family will enjoy for years to come!
  
 
  
 
 
 
 
 
 
 Google rating score: 4.9 of 5, based on 83 reviews 
 
   
 
 

Frequently Asked Questions

How much does a sunroom cost in Texas in 2026?

Texas sunroom cost in 2026 ranges from $15,000 for a basic screen room up to $90,000+ for a four-season insulated glass room. Three-season glass rooms run $25,000–$55,000. Per square foot, three-season sunrooms land around $150–$300/sq ft, four-season sunrooms $300–$500+/sq ft. Price depends on sunroom type, size, foundation condition, and engineering requirements for the TDI windstorm catastrophe area.

What’s the difference between a three-season and four-season sunroom?

A three-season sunroom is uninsulated or lightly insulated — single-pane glass or screen walls, uninsulated roof. It’s usable most of the year except peak summer and cold snaps. A four-season sunroom has dual-pane insulated glass, an insulated roof, and dedicated HVAC. It’s treated like interior living space and used year-round. The cost difference is typically $20,000–$40,000 for the same footprint.

Can I put a sunroom on my existing concrete patio?

Sometimes. The slab has to be inspected first: minimum 4″ thick, crack-free, correctly reinforced, and rated to carry the structural load. Older thin patios often fail inspection and need to be replaced. Using a sound existing slab can save $2,000–$6,000. Using a bad one causes problems later.

Do I need a permit for a sunroom in Houston?

Yes. Every incorporated city on the Texas Gulf Coast requires a permit for a sunroom addition, and most require engineer-sealed plans. Unpermitted sunrooms cause insurance claim denials and resale problems. Permit fees typically run $200–$600, filed by the contractor as part of the project.

How long does a sunroom build take on the Gulf Coast?

Three-season sunrooms typically take 4 to 8 weeks from signed contract to final inspection. Four-season sunrooms with HVAC tie-in take 6 to 10 weeks. The schedule depends on engineering turnaround, permit approval, HOA review, foundation cure time, and HVAC install.

Will a sunroom add value to my home?

In Texas Gulf Coast markets, a well-built, permitted, engineer-stamped sunroom typically adds to appraised value and shortens days-on-market. Four-season sunrooms are often appraised as added square footage of living space. Three-season sunrooms add less to appraised value but still improve resale appeal. Unpermitted or poorly built sunrooms can reduce value.

What’s the warranty on a Simmons Home Design sunroom?

SHD sunroom builds come with a 5-year labor and workmanship warranty, a limited lifetime warranty on the structural aluminum frame, and manufacturer warranties on glass (varies by product) and screen (Phifer 3-year standard or 10-year upgraded mesh).