Room Addition Cost in Houston, TX (2026)

Room Addition in Houston, TX costs $19,308–$47,190 in 2026, with most homeowners paying around $33,249. That’s about 5% below the national average (BLS cost index: 0.95). Licensed remodelers in the Houston-The Woodlands-Sugar Land metro charge $55–$100/hour. 6-12 weeks for 200 sq ft Houston typically requires permits for this work, running $300–$2000.

Updated April 2026Based on public BLS & industry data

Estimated Cost

$19,308–$47,190

Mid-range estimate for 200 sq ft in Houston, TX. Labor: $55–$100/hr.

Foundation & concrete: $12–$20/sq ft
Framing & sheathing: $10–$20/sq ft
Roofing: $5–$12/sq ft
Insulation & drywall: $5–$10/sq ft
Windows & doors: $1500–$4000/set
Electrical & HVAC tie-in: $5–$12/sq ft

Calculate Your Cost

Addition size (sq ft)

80–800 sq ft

Material Grade

Additional Factors

Second-story addition(+$5,000–$15,000)

Include full bathroom(+$8,000–$20,000)

Factors That Affect Cost

1Addition size and foundation type
2Roofline integration complexity
3HVAC extension requirements
4Second-story vs ground-level
5Architectural and engineering fees
6Permit and inspection costs

Permit Note

Harris County requires permits for most electrical, plumbing, and structural work. Permit fees typically range $75–$250. Inspections are usually scheduled within 3–5 business days.

Planning a room addition

Start with a site survey and check zoning setbacks. Foundation type (slab vs crawlspace) depends on your existing home. Matching the roofline to the existing structure is critical for curb appeal.

Bump-out vs full addition

A bump-out (under 100 sq ft) costs less since it may not need a new foundation. Full additions require foundation work but offer more flexible layouts.

How We Calculate These Numbers

Our cost estimates are built from publicly available data including the Bureau of Labor Statistics (BLS) Occupational Employment & Wage Statistics, HomeGuide, Thumbtack, and Fixr cost databases. Material prices reflect national averages from major retailers, cross-referenced across 3+ sources for accuracy.

For Houston, we apply a regional cost-of-living multiplier of 0.95 (5% below the national average) based on BLS regional data. Labor rates reflect the local Houston metro market as of 2026.

QuotrPro Pricing Research Team

AI-powered estimating platform used by contractors across the US. Data reviewed quarterly against BLS and industry benchmarks.

These are estimates for planning purposes. Actual costs vary by project scope, contractor, and market conditions. Always get 2–3 quotes from licensed professionals.