From first-story expansions to second-story additions, RB Master Builders helps create space that feels integrated with the original home. When a project expands your footprint, public hearings may be required — and we help you navigate those municipal processes with clear communication and experienced representation so the path to approval stays as smooth as possible.
Our Process
Review
We assess the home, desired square footage, site access, and whether planning review or public hearings may apply.
Estimate
We map the work needed to connect the new space — including permitting and hearing timelines when required.
Build
Construction is coordinated around structure, envelope, utilities, and finishes.
Walkthrough
We review the completed addition and final details together.
Project Types & Permitting Guide
Project Types for Home Addition
Relevant project types for home addition — including permitting timelines, team requirements, and utilities. Requirements vary by municipality and scope.
First Story Addition
Adding square footage to first story of house.
Permitting Timeline
- Planning department
- 4–6 weeks
- Building department
- 4–6 weeks
- PG&E Permitting
- 3 weeks – 6 months
- Public Hearings
- Unlikely
Fees
- School Fees
- Depends on municipality — below 500–750 sqft it doesn't apply; above that, scales linearly
Project Team
- Architect required
- Yes
- Structural Engineer
- Yes
- Geotechnical Engineer
- Yes
- Topographic survey
- Yes if addition is close to setbacks
- Civil engineer
- Possible
- Landscape Architect
- Likely
- Arborist
- If new construction is near any major trees
- Special Inspection
- Yes
Utilities
- Fire sprinklers
- Only if main house is sprinklered
- PG&E: Electric Panel
- Very likely, unless house already has at least a 200 amp panel
- Water Meter Upgrade
- Unlikely, unless fire sprinklers required
- Sewer upgrade
- Unlikely
Adding square footage to first story of house.
Permitting Timeline
- Planning department
- 4–6 weeks
- Building department
- 4–6 weeks
- PG&E Permitting
- 3 weeks – 6 months
- Public Hearings
- Unlikely
Fees
- School Fees
- Depends on municipality — below 500–750 sqft it doesn't apply; above that, scales linearly
Project Team
- Architect required
- Yes
- Structural Engineer
- Yes
- Geotechnical Engineer
- Yes
- Topographic survey
- Yes if addition is close to setbacks
- Civil engineer
- Possible
- Landscape Architect
- Likely
- Arborist
- If new construction is near any major trees
- Special Inspection
- Yes
Utilities
- Fire sprinklers
- Only if main house is sprinklered
- PG&E: Electric Panel
- Very likely, unless house already has at least a 200 amp panel
- Water Meter Upgrade
- Unlikely, unless fire sprinklers required
- Sewer upgrade
- Unlikely
Timelines are estimates based on typical Bay Area / California permitting norms and vary by city, lot conditions, and project scope.