If your Oncor bill hit $400 last August, you already know what Zone 3A feels like from the inside. Fort Worth bakes. The west side of the Metroplex pushes past 100°F for weeks at a time, and a lot of the housing stock in neighborhoods like Fairmount and Ryan Place was built decades before anyone thought seriously about air sealing. Many of those homes sit on pier-and-beam foundations, which changes the spray foam conversation entirely compared to the slab construction that dominates newer DFW suburbs.

This breaks down what spray foam actually costs in Tarrant County in 2026, where local pricing differs from Dallas proper, and what Oncor rebates might recover for you.

What spray foam costs in the Fort Worth market

Fort Worth and the surrounding Tarrant County cities run slightly cheaper on spray foam labor than the I-35 corridor into Dallas. Less contractor traffic, fewer fuel surcharges baked into bids, more local competition on the west side of the Metroplex. Material costs are consistent statewide regardless.

Open-cell spray foam in Tarrant County typically runs $0.85 to $1.30 per board foot installed. For a standard 1,500-square-foot attic, you’re looking at $2,800 to $5,200 depending on depth and access.

Closed-cell runs $1.75 to $3.25 per board foot. The same attic in closed-cell lands between $5,500 and $9,000 — and for crawl spaces or rim joists, closed-cell is almost always the right call anyway.

Full-home encapsulation (attic plus crawl space plus walls) in Aledo or Keller ranges from $8,000 to $18,000 depending on square footage and whether the crawl space needs moisture remediation before foam goes in.

Pier-and-beam homes: where the Fort Worth scope diverges

A significant portion of the historic Fort Worth neighborhoods — Fairmount, Ryan Place, Mistletoe Heights, the Linwood area — was built in the early-to-mid 20th century on pier-and-beam foundations. That means a crawl space under the home, not a slab, and for spray foam contractors that’s a different job.

The floor joists and subfloor need air sealing and insulation separately from the attic. Tight crawl space clearances take longer to work in and cost more per square foot to access. Moisture also matters more here than in a standard attic — vapor barriers often need attention before foam goes in.

A typical pier-and-beam crawl space job in Fort Worth runs $3,500 to $8,000 depending on square footage and how difficult access is. Homes in Ryan Place or Fairmount with low clearances or older structural quirks can push the upper end.

If a contractor quotes you the same price they’d give a Keller slab home for a Fairmount pier-and-beam, ask them to walk you through why.

Prices by area: TCU, Westover Hills, Burleson, and beyond

TCU area / Monticello / West 7th: Older infill, mix of pier-and-beam and slab. Decent contractor competition in this corridor. Attic-only jobs run $3,000 to $6,500.

Westover Hills / Rivercrest: Larger homes with more square footage. Full encapsulation on estate-sized properties runs $12,000 to $20,000. Finished attic spaces here often call for closed-cell.

Aledo / Willow Park: Newer slab construction, but builders typically install minimum-code fiberglass batt in attics. Spray foam upgrades run $4,000 to $9,000 for attic encapsulation.

Burleson / Joshua: Contractor density drops south of Fort Worth, and you’ll see some bids starting around $2,600. On jobs priced that low, it’s worth asking about application depth — thinner foam means lower R-value and a shorter payback window.

Keller: Competitive market, good contractor access, pricing lands close to the Fort Worth average.

Oncor rebates in Tarrant County

Most of Fort Worth falls under Oncor’s service territory. Oncor runs a rebate program called Smart $aver for home energy improvements, and insulation upgrades qualify.

Rebates for attic insulation and air sealing have historically landed in the $0.10 to $0.25 per square foot range, with some whole-home improvement projects recovering more. Program caps shift year to year, and some project types require pre-approval before work starts — so check Oncor’s current Smart $aver portal before your contractor schedules the job.

The rebate won’t cover a major portion of the project. But on a $6,000 attic job, $400 back is $400 back.

Open-cell vs. closed-cell: which one for Zone 3A

Open-cell foam hits around R-3.7 per inch and expands aggressively, which makes it fast and affordable for attic applications where budget matters and moisture isn’t a variable. It does absorb water, so it’s not the right call for pier-and-beam crawl spaces where ground moisture is a real factor.

Closed-cell hits R-6 to R-7 per inch, doubles as a vapor barrier, and adds structural rigidity to rim joists and crawl space walls. Costs more upfront. In a Fairmount pier-and-beam or any application where moisture has a path in, it earns the premium over time.

For most Tarrant County attic projects, open-cell at 5 to 6 inches is the standard bid and the most common recommendation. For crawl spaces and exterior walls, closed-cell almost always comes out ahead.

FAQ

How long does spray foam take to pay back in Fort Worth?

In a home running $350 to $500 monthly on Oncor during summer, a well-executed attic spray foam job typically cuts cooling costs 20 to 40 percent. At that rate, a $5,000 project pays back in 4 to 7 years. Pier-and-beam homes that also add crawl space insulation often get there faster because the floor was leaking conditioned air in both directions.

Does spray foam work in a pier-and-beam crawl space?

It does, and it’s one of the better uses for closed-cell foam. You’re spraying the underside of the floor joists and subfloor to create an air barrier. In older Fort Worth homes, this also reduces the drafty-floors problem in winter — something slab homes never deal with.

Is spray foam worth it in a home you plan to sell?

Energy efficiency upgrades are showing up in Fort Worth listings more than they used to. A fully insulated attic and crawl space in a Mistletoe Heights or Ryan Place home removes an objection for buyers who’ve been burned by high Oncor bills. It probably won’t add dollar-for-dollar to appraised value, but it’s not nothing.

Can spray foam cause mold or moisture problems?

Done correctly, no. Done wrong — wrong foam type, wrong thickness, poor surface prep — yes, it can trap moisture. Pier-and-beam homes in particular need a contractor who understands crawl space vapor dynamics, not just attic work. Before you sign anything, ask specifically how many crawl space jobs they’ve done under old Fort Worth construction.