Mission Viejo, Orange County

ADU / Guest House Cost in Mission Viejo, CA

Mission Viejo remodeling costs are nearthe California state average. Here's what a typical adu / guest house costs in Mission Viejo in 2026, based on a 500 sqf project.

Budget
$131,250
$263/sqf
Mid-Range
$210,000
$420/sqf
High-End
$315,000
$630/sqf

Cost breakdown

Foundation & Framing
25%$52,500
Mechanical (HVAC, Plumbing, Electrical)
20%$42,000
Interior Finishes
20%$42,000
Exterior & Roofing
15%$31,500
Kitchen & Bath Fixtures
10%$21,000
Permits, Plans & Engineering
10%$21,000

Breakdown based on mid-range estimate of $210,000

Typical Timeline
4-8 months
Permits Required

Building, electrical, plumbing, mechanical. May require plan check.

Remodeling in Mission Viejo

Master-planned community with well-maintained homes from the 1970s-90s. Many are now due for kitchen and bathroom updates. HOA restrictions may limit exterior changes.

California allows ADUs on most residential lots since 2020. An ADU adds living space and rental income. Cities must approve or deny within 60 days of a complete application.

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Other projects in Mission Viejo

Kitchen Remodel
$31,500 – $94,500
Bathroom Remodel
$15,750 – $50,400
Room Addition
$63,000 – $173,250
Roof Replacement
$13,125 – $39,375
Exterior Paint
$5,250 – $18,375
Whole House Remodel
$283,500 – $945,000

ADU / Guest House cost in other California cities

Santa Cruz
$143,750 – $345,000 | Santa Cruz County
Long Beach
$125,000 – $300,000 | Los Angeles County
Vacaville
$112,500 – $270,000 | Solano County
San Bernardino
$100,000 – $240,000 | San Bernardino County
Carlsbad
$137,500 – $330,000 | San Diego County
Rancho Cucamonga
$112,500 – $270,000 | San Bernardino County
Salinas
$112,500 – $270,000 | Monterey County
Encino
$137,500 – $330,000 | Los Angeles County

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