Josh Brooks Construction — Licensed • Insured • 31 Years

Residential Addition Builders
Longmont, CO — Expand Your Home, Not Your Stress

Home additions in Longmont typically cost $150–$300 per square foot fully finished. A 400 sq ft master suite addition runs $60,000–$120,000. A second story addition runs $120,000–$250,000. Free written estimates on all projects.

Adding square footage is the highest-ROI investment a Longmont homeowner can make — especially in Boulder County’s tight real estate market.

📞 720-828-7997
Free Estimate

Proof Points & Legitimacy

Why Hire Josh Brooks Construction?

✓ License CON-24-0152 — verifiable at Colorado DORA
✓ 31 years of hands-on Front Range construction experience
✓ Seventh-generation builder — Josh Brooks personally manages every project
✓ $1M/$2M general liability insurance
✓ 2167 Frontier St, Longmont CO 80501 — local, not a call center
✓ Senior & Veteran discounts available
✓ Free written estimates — clear price before any work starts

Get Started Today

Free Written Estimate

No pressure. No obligation. We come to your home, inspect the project, and give you a clear written price — usually within 24 hours.

📞 Call 720-828-7997
💬 Text 720-597-6232

CON-24-0152 • $1M/$2M Insured • 2167 Frontier St, Longmont CO 80501

FAQ

Common Questions

How much does a home addition cost in Longmont CO?

Home additions in Longmont typically cost $150–$300 per square foot fully finished. A 400 sq ft master suite addition runs $60,000–$120,000. A garage conversion to living space runs $30,000–$60,000. A second story addition runs $120,000–$250,000+. Cost depends on foundation requirements, utility extensions, and finish level. We give you a fixed-price written estimate before any work begins.

Do I need a permit for a home addition in Longmont?

Yes. All home additions in Longmont require a building permit from the City of Longmont Building Inspection Division. This includes foundation permits, framing inspections, electrical and plumbing rough-in inspections, and a final occupancy inspection. Josh Brooks Construction handles all permitting for home additions in Longmont — we know the local inspection requirements inside and out.

How long does a home addition take in Longmont CO?

Most home additions in Longmont take 3–6 months from permit approval to final inspection. Permit processing typically takes 4–8 weeks. Construction on a standard room addition takes 8–16 weeks depending on size and complexity. Second story additions and major structural projects run longer. We give you a detailed project schedule and phase timeline before we break ground.

What types of home additions does Josh Brooks Construction build in Longmont?

We build master suite additions, bedroom additions, garage conversions, sunrooms, covered patios, second story additions, mudrooms, and full bump-out expansions. We handle every trade under one contract — framing, roofing, siding, electrical, plumbing, HVAC, insulation, drywall, flooring, and trim. You get one point of contact and one fixed price.