Woodland Hills is one of the western Valley neighborhoods most actively adding space to existing homes. The large lots that characterize Walnut Acres, the streets north of Ventura, and the hillside properties approaching the Santa Monica Mountains offer more room for additions than most LA neighborhoods. APLA Construction (CA Lic #1136359) handles room additions throughout Woodland Hills — from primary suite additions to family room expansions and second-story builds.
Full Los Angeles room addition cost guide.
Woodland Hills is in the City of Los Angeles. All room addition permits go through LADBS. Room additions require structural, electrical, plumbing, and mechanical permits. LADBS plan check for additions typically takes 6–10 weeks. Hillside properties in Woodland Hills may require geotechnical investigation before permit submission. APLA manages the full permit process — feasibility assessment, design, LADBS submission, plan check response, and inspection coordination.
The defining characteristic of Woodland Hills that makes room additions feasible is lot size. The average Woodland Hills lot (8,000–15,000 sq ft) has significantly more rear yard space than typical Sherman Oaks or Studio City lots. This means:
A bedroom addition in Woodland Hills costs $82,000–$152,000. A primary suite addition costs $125,000–$225,000. A partial second story addition costs $215,000–$375,000. All prices include design, LADBS permit fees, and construction.
8–20 months total depending on scope. LADBS plan check for room additions takes 6–10 weeks. Hillside projects requiring geotechnical investigation add 4–8 weeks to the design phase. Construction takes 4–9 months.
Yes. APLA handles additions on hillside properties throughout Woodland Hills — including fire zone lots. Hillside additions require geotechnical engineering and engineered foundations. APLA coordinates geotechnical investigation and structural engineering as part of the design phase. Call (818) 818-4419 for a free feasibility assessment.
Yes. California and Los Angeles city rules allow both a room addition and an ADU on the same single-family property. Many Woodland Hills homeowners combine a primary suite addition to the main house with a garage conversion ADU for rental income — both projects can be permitted and built simultaneously or in sequence. APLA can design and manage both.
Call: (818) 818-4419
Email: info@aplaconstruction.com
CA General Contractor License #1136359
Serving Woodland Hills, West Hills, Tarzana, Calabasas adjacent, and the western San Fernando Valley. Room Addition Los Angeles | General Contractor Woodland Hills | Woodland Hills Building Guide