600 sq ft home addition opening into an open-concept great room in San Carlos

An addition done right looks like it was always part of the house. We handle structural engineering, foundation tie-ins, roofline integration, and finish matching so the new space feels native — not bolted on.

What's Included

Every room additions project from High Touch Consulting includes:

  • Single-story additions and bump-outs
  • Full second-story additions
  • Primary suite additions
  • Family room and great room expansions
  • Foundation work and structural tie-ins
  • Roofline matching and integration
  • Stucco, siding, and exterior finish matching
  • HVAC, electrical, and plumbing extensions

Why Homeowners Choose Us

We're a fully licensed California general contractor (CSLB #1008964) with 11 years of experience navigating Bay Area permitting, building departments, and the unique conditions of Peninsula and Silicon Valley homes. Every project comes with a fixed-scope written proposal, weekly progress updates, and a single project manager from start to final inspection.

Where We Work

We provide room additions services throughout the San Francisco Peninsula, Silicon Valley, and Marin County, including San Francisco, South San Francisco, Daly City, San Bruno, Millbrae, Burlingame, San Mateo, Foster City, Belmont, San Carlos, Emerald Hills, Redwood City, Menlo Park, Stanford, Palo Alto, Los Altos Hills, Los Altos, Mountain View, Cupertino, Sunnyvale, Saratoga, Santa Clara, Campbell, San Jose, Portola Valley, Sausalito, Mill Valley, Tiburon, San Rafael.

Popular Room Additions Locations

FAQ

Common Questions About Room Additions

How long does a home addition take?

Most additions run 4–9 months of construction depending on size and complexity, plus 3–6 months of design and permitting.

Do you match existing finishes?

Yes — exterior stucco, siding, paint, roofing, and interior trim profiles are matched so the addition reads as original.

How much does a home addition cost in the Bay Area?

Single-story additions typically run $400–$700 per square foot finished, depending on the scope and finish level. Second-story additions run higher because of structural and access complexity. We provide fixed-scope written proposals.

Do additions require structural engineering?

Yes. Every addition requires structural calculations and engineered drawings to address foundation tie-ins, lateral loads, and seismic compliance. We engage the engineer as part of the design-build scope.

Can I add a second story to my home?

Often yes — we evaluate the existing foundation, framing, and lateral system, then engineer a second-story addition with appropriate upgrades. Some homes need foundation reinforcement; we identify this during the consultation.

Do you handle the addition permits?

Yes. We submit all building, structural, electrical, plumbing, and mechanical permits — and on additions, we typically also handle Planning Department review for the envelope changes.

Ready to start your remodel?

Get a no-cost on-site consultation and a fixed-scope written proposal from a licensed Bay Area general contractor.