Planning a room addition in Houston? Use our interactive cost calculator below to get accurate estimates for your specific project and discover how to maximize your investment with this comprehensive 2025 pricing guide from Marvel Works.
🏠 Interactive Room Addition Cost Calculator
Average Room Addition Cost in Houston 2025
The average room addition cost in Houston ranges from $32,000 to $80,000 for a standard 20×20 addition, depending on the type of room and construction complexity. Here’s what Houston homeowners typically spend on room additions:
- Build Out (Horizontal): $80 – $200 per square foot
- Build Up (Second Story): $300 – $500 per square foot
- Small Addition (100-200 sq ft): $12,500 – $40,000
- Large Addition (400-600 sq ft): $50,000 – $120,000
Houston Room Addition Cost Breakdown
Foundation and Structural Work (20-30% of Budget)
- Concrete Slab Foundation: $8 – $15 per square foot
- Pier and Beam Foundation: $12 – $25 per square foot
- Structural Engineering: $800 – $2,500
- Foundation Repair (if needed): $2,000 – $8,000
Framing and Roofing (25-35% of Budget)
- Wood Framing: $15 – $30 per square foot
- Roofing Materials: $8 – $18 per square foot
- Roof Integration: $2,000 – $5,000
- Hurricane-Resistant Features: Additional $1,500 – $4,000
Houston Room Addition Cost by Type
Bedroom Addition
- Small Bedroom (10×12): $15,000 – $35,000
- Large Bedroom (14×16): $25,000 – $55,000
- Master Bedroom (16×20): $40,000 – $85,000
Bathroom Addition
- Half Bath (6×8): $18,000 – $35,000
- Full Bath (8×10): $28,000 – $55,000
- Master Bath (10×12): $40,000 – $75,000
Kitchen Extension
- Small Extension (8×10): $35,000 – $65,000
- Large Extension (12×15): $55,000 – $95,000
- Full Kitchen Addition: $75,000 – $150,000
Factors Affecting Room Addition Costs in Houston
Several Houston-specific factors impact your room addition cost:
- Foundation Type: Houston’s clay soil often requires special foundation work
- Hurricane Standards: Building codes require wind-resistant construction
- Flood Zone Requirements: Some areas need elevated construction
- HOA Restrictions: Many Houston neighborhoods have specific design requirements
- Permit Costs: Harris County permits typically cost $500-$2,000
Get Your Room Addition Started
Marvel Works specializes in room additions throughout Houston, Spring, and The Woodlands. Our experienced team handles everything from design and permits to construction and finishing touches.
Call 832-390-8685 today for a free consultation and detailed estimate for your room addition project.
