Home Addition Contractor Boulder County CO — Room Additions & Second Stories
When your home no longer fits your life, you have two options: move, or build. In Boulder County’s competitive real estate market, building an addition is often far more cost-effective than buying a larger home — especially when you’re already in the neighborhood and school district you love. Josh Brooks Construction and Renovation Inc. builds room additions, second stories, and sunroom expansions throughout Boulder County with full structural engineering, permitting, and general contractor oversight.
Types of Home Additions We Build
- Room addition: Adding square footage to expand a kitchen, master suite, family room, or office
- Second story addition: Adding a full second floor over the existing footprint — the most cost-effective way to double your living space
- Garage conversion with addition: Converting attached garage to living space while adding a new detached garage
- Sunroom or four-season room: Enclosed addition with full insulation, HVAC, and windows
- Master suite addition: Primary bedroom with walk-in closet, full bath, and direct outdoor access
Home Addition Costs in Boulder County 2026
- Single-room addition (400–600 sq ft): $120,000–$200,000
- Second story addition: $200–$300/sq ft of added space
- Master suite addition: $150,000–$280,000 depending on size and finishes
Boulder County’s premium land values and material costs trend higher than other Colorado markets, but return on investment is also stronger given median home prices.
The Full-Service Advantage for Additions
An addition involves every trade — structural engineering, foundation, framing, roofing, siding, insulation, drywall, electrical, plumbing, HVAC, flooring, painting, and millwork. Josh Brooks Construction manages all of it under one contract. We coordinate structural engineering, pull all permits, and serve as your single point of contact from the first shovel to the final punch-out.
Free Addition Consultation in Boulder County
Call 720-828-7997 | 2167 Frontier St, Longmont, CO 80501 | Boulder County Licensed CON-25-0089 | Veteran-Owned