Services
From the first sketch to the final walkthrough, KEYSTONE manages every dimension of a construction project. We specialize in work that demands both design intelligence and construction rigor — the kind of project where the two disciplines must speak the same language.
Custom Homes
From vacant lot to move-in day, KEYSTONE manages every phase of a custom home build. We work with your architect of record — or our own in-house design team on design-build projects — to ensure that what gets built is exactly what was designed, on time, and on budget. Our custom homes range from 2,400 sf hillside cabins to 10,000+ sf estate compounds.
Start a custom homes inquiry- Site analysis and geotechnical coordination
- Pre-construction budgeting and value engineering
- Full permit coordination across CA jurisdictions
- Structural, mechanical, electrical, and plumbing
- Custom millwork and finish carpentry
- Landscaping and hardscape integration
- Smart-home systems and AV rough-in
- 10-year KEYSTONE structural warranty
Whole-Home Renovation
A whole-home renovation with KEYSTONE means one contract, one schedule, one point of accountability. We sequence structural, seismic, mechanical, and finish work so that no trade returns twice and the client moves back in once. Our pre-construction team develops a phasing plan that minimizes disruption — most clients can occupy a portion of the home throughout construction.
Start a whole-home renovation inquiry- Seismic soft-story and cripple-wall retrofits
- Full MEP (mechanical, electrical, plumbing) replacement
- Kitchen and bath design + construction
- Window and door replacement (energy code compliance)
- Flooring, paint, tile, and finish coordination
- Solar and battery-storage integration
- ADU / in-law suite additions
- Interior demolition and abatement coordination
Design-Build
KEYSTONE's design-build model collapses the traditional gap between architect and contractor. Our in-house design director partners with clients from concept through construction documents, then hands the project to our field team with zero translation loss. Design decisions are made with real cost and schedule data from day one — no surprises at the end of schematic design.
Start a design-build inquiry- Concept design and site feasibility
- Schematic design and design development
- Construction document production
- Permit filing and agency coordination
- Full construction management
- Interior selections and procurement
- Furniture, fixtures, and equipment coordination
- Single contract — one point of accountability
Commercial Fit-Out
Commercial fit-out requires a different discipline than residential construction: active neighboring tenants, base-building coordination, certificate-of-occupancy deadlines, and clients who measure success in dollars-per-day of delay. KEYSTONE's commercial team has delivered 14,000+ sf offices, flagship retail stores, medical suites, and hospitality interiors — all on time, most early.
Start a commercial fit-out inquiry- Tenant improvement permitting and base-building coordination
- MEP design-assist and coordination modeling
- Demising walls and structural alterations
- Custom millwork and commercial casework
- Commercial-grade flooring (terrazzo, hardwood, tile, carpet tile)
- Acoustic systems and sound-rated assemblies
- Data, AV, and building automation rough-in
- ADA compliance and egress coordination
Additions & ADUs
Additions are among the most technically demanding projects in residential construction: every connection to the existing structure is an opportunity for a cold joint, a water intrusion point, or a visible seam. KEYSTONE's approach treats the original building as a design constraint to be honored, not an obstacle to be ignored. We've built horizontal additions, second-story additions, detached ADUs, and everything in between.
Start a additions & adus inquiry- Structural analysis of existing conditions
- Foundation design and micro-pile alternatives
- Roof and wall tie-in details
- Energy code Title 24 compliance for new scope
- Matching existing materials (stucco, siding, roofing)
- ADU permitting under SB 9 and local ordinances
- Utility connections (gas, electric, water, sewer)
- Occupied-home construction phasing
Not sure which service fits?
Most projects blend two or more disciplines. Tell us what you're trying to accomplish and we'll help you identify the right approach.
Describe your project