Room Additions in Gilbert, AZ

For Gilbert / East Valley in 2025–2026, mid-range attached room additions commonly fall in a planning range of roughly $150–$280+ per finished square foot, depending on plumbing, structural complexity, and finishes. Local guidance often places a standard single-story addition around $160–$260/sq ft. A typical 280–400 sq ft primary suite or living addition often lands in the roughly $45,000–$100,000+ band; Arizona rooms frequently plan in the $35,000–$65,000 range; detached casitas commonly run higher. These are market planning figures only — every project is quoted from a defined on-site scope.

Yes. Both attached room additions and detached casitas / guest suites are within Dual KB-1 scope. We design for Town setbacks, any HOA ARC rules, and utility connections as part of the project.

After design and approvals, construction for a mid-size attached addition often runs several months. Larger primary suites and detached casitas take longer. Town plan review is often a few weeks for complete packages; HOA ARC commonly adds 30–45 days and should start early. We issue a project-specific schedule once scope and approvals are locked.

Yes. Complete Dual KB-1 permit packages for Town of Gilbert Development Services and architectural packages for HOA ARC review (required in most Gilbert master-planned communities) are part of our standard addition process.

Much of Gilbert sits on expansive clay. We design foundations (including post-tension where appropriate) and moisture control details so the addition and the existing home are compatible over time under Dual KB-1 structural coordination.

All of Gilbert, including Power Ranch, Seville, Agritopia, Val Vista Lakes, Cooley Station, San Tan Ranch, and the broader Town ZIP codes.

One license covers structural design coordination, permitting, and construction of the addition under a single bonded and insured entity. That keeps foundation, framing, envelope, and finishes accountable to one team through final inspection.