Pleasant Hill, Contra Costa County

Room Addition Cost in Pleasant Hill, CA

Pleasant Hill remodeling costs are nearthe California state average. Here's what a typical room addition costs in Pleasant Hill in 2026, based on a 300 sqf project.

Budget
$63,000
$210/sqf
Mid-Range
$110,250
$368/sqf
High-End
$173,250
$578/sqf

Cost breakdown

Foundation & Framing
30%$33,075
Roofing & Exterior
15%$16,538
Mechanical (HVAC, Electrical)
15%$16,538
Interior Finishes
20%$22,050
Windows & Doors
10%$11,025
Permits & Engineering
10%$11,025

Breakdown based on mid-range estimate of $110,250

Typical Timeline
3-6 months
Permits Required

Building permit, structural engineering, possibly zoning approval.

Remodeling in Pleasant Hill

Central Contra Costa location with 1960s-70s housing stock. Active remodeling market with moderate costs. Good contractor access from the 680 corridor.

A room addition adds square footage and value to your home. Costs depend on whether it's a simple bump-out, a second story, or a full wing addition with plumbing.

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Other projects in Pleasant Hill

Kitchen Remodel
$31,500 – $94,500
Bathroom Remodel
$15,750 – $50,400
ADU / Guest House
$131,250 – $315,000
Roof Replacement
$13,125 – $39,375
Exterior Paint
$5,250 – $18,375
Whole House Remodel
$283,500 – $945,000

Room Addition cost in other California cities

Foster City
$75,000 – $206,250 | San Mateo County
Mission Viejo
$63,000 – $173,250 | Orange County
Castro Valley
$66,000 – $181,500 | Alameda County
Huntington Beach
$66,000 – $181,500 | Orange County
Half Moon Bay
$72,000 – $198,000 | San Mateo County
Belmont
$75,000 – $206,250 | San Mateo County
Pasadena
$66,000 – $181,500 | Los Angeles County
Irvine
$66,000 – $181,500 | Orange County

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