Home Additions in Campbell, CA
Get a Free Campbell Addition Consultation
Site and Architectural Review for Additions
Site and Architectural Review depends on your neighborhood:
- San Tomas Area Neighborhood Plan (R-1-6): administrative review for a new home, additions (Planning Commission above 0.45 floor area ratio), attic-to-living conversions, removing or rebuilding more than 50% of exterior walls, or adding up to two bedrooms.
- Campbell Village Neighborhood Plan (R-1-8): administrative review for a new home, additions of 750 sq ft or more, or 375 sq ft or more on a second story.
- Other R-1-6 lots outside San Tomas, and smaller Campbell Village additions, are exempt.
Administrative decisions are made by the Community Development Director after notice is mailed to owners within 300 feet at least 10 days ahead, and take effect 10 days after approval unless appealed. R-1 homes are limited to 35 feet and 2½ stories, with a base floor area ratio of 0.45 (up to 0.50 with Planning Commission approval).
Addition Work
Sprinklers, Trees and Fees
Fire sprinklers (Campbell local amendment): required in new homes, and in existing homes when an addition makes the fire area larger than 3,600 sq ft (additions of 500 sq ft or less are excepted), plus new basements and basements expanded more than 50%.
Protected trees: on developed single-family lots, oak, redwood, cedar and ash with a 12-inch trunk at 4 feet, plus heritage trees. Trenching or regrading within a tree’s dripline counts as removal, and replacements are 24-inch to 48-inch box trees.
School fees: Campbell Union School District charges fees on new homes and additions over 500 sq ft, paid before permit issuance using the City’s referral form; Campbell Union High School District also assesses new residential space.
City Hall, 70 N. First Street, Campbell, CA 95008 · (408) 866-2130
Call ahead to confirm counter hours and current submittal steps. Fire sprinkler plans go to Santa Clara County Fire, Fire Prevention, 1315 Dell Avenue, Campbell, (408) 341-4420, with a copy of the City building permit.
Explore More
Other Campbell services: Bathrooms · Kitchens · New Homes · Campbell ADU builder · Campbell overview
Same service nearby: Los Gatos · Saratoga · Santa Clara
Campbell Home Additions FAQ
Does my Campbell addition need Site and Architectural Review?
It depends on your neighborhood plan; San Tomas and Campbell Village have their own triggers.
How far does notice reach?
Owners within 300 feet, at least 10 days before the decision.
When does an addition need sprinklers?
When it makes the fire area larger than 3,600 sq ft, unless 500 sq ft or less.
What is the floor area limit?
A base floor area ratio of 0.45 in R-1.