Room Addition Contractor Brentwood CA — Costs & 2026 Guide

Room Addition Contractor in Brentwood, CA

Brentwood room additions are premium westside investments in one of Los Angeles’s most enduringly desirable neighborhoods. Bordered by Bel Air, Pacific Palisades, Santa Monica, and the 405, Brentwood has remained consistently competitive with the top westside neighborhoods for decades. Home values of $2.5M–$12M+ for single-family homes support room addition investments that would be disproportionate in other markets but are entirely appropriate here. APLA Construction (CA Lic #1136359) handles room addition projects throughout Brentwood, managing all LADBS permits and luxury construction trades.

Room Addition Costs in Brentwood (2026)

Ground-Floor Primary Suite Addition

• Cost: $245,000–$480,000
• Timeline: 22–36 weeks
• Scope: New 600–850 sq ft primary bedroom with walk-in closet, en suite bath with slab stone (travertine or quartzite), steam shower, soaking tub, radiant heat; integrated with existing architecture at a level that matches Brentwood’s premium residential character

Guest Suite or Family Room Addition

• Cost: $192,000–$380,000
• Timeline: 18–30 weeks

Second Story Addition

• Cost: $495,000–$1,050,000+
• Timeline: 32–54 weeks
• Notes: Brentwood is in the City of Los Angeles (LADBS). Second story additions require LADBS structural plan check (10–16 weeks). Many Brentwood homes are Spanish Colonial, Traditional, or Cape Cod styles — adding a second story requires careful architectural integration. Premium finish level throughout ($380–$580/sq ft) is appropriate for Brentwood at $2.5M–$12M+ home values.

Brentwood Building Permits (LADBS)

Brentwood is a neighborhood of the City of Los Angeles — all permits go through LADBS. Plan check for room additions is 8–14 weeks at LADBS. APLA manages all LADBS submissions for Brentwood addition projects, including hillside review for properties in the canyon areas (Sullivan Canyon, Mandeville Canyon, Brentwood Glen).

Frequently Asked Questions — Room Addition Brentwood CA

How much does a room addition cost in Brentwood in 2026?

Ground-floor primary suite: $245,000–$480,000. Guest suite: $192,000–$380,000. Second story: $495,000–$1,050,000+. Brentwood is a top-tier westside market — priced above Westwood and Santa Monica, competitive with Pacific Palisades and Beverly Hills for equivalent addition scopes.

How long does a room addition take in Brentwood?

Ground-floor: 18–36 weeks. Second story: 32–54 weeks. LADBS plan check is 8–14 weeks for room additions — the primary pre-construction schedule variable. APLA submits Brentwood addition permits strategically to minimize LADBS review time.

Does APLA handle Brentwood hillside additions?

Yes. Brentwood canyon properties (Sullivan Canyon, Mandeville Canyon, Brentwood Glen) require hillside grading permits, soils reports, and geotechnical engineering in addition to standard LADBS review. APLA has experience with Brentwood hillside construction and manages all of these additional requirements. Call (818) 818-4419.

Does APLA do room additions in Brentwood?

Yes. APLA (CA Lic #1136359) handles room additions throughout Brentwood — flat properties and canyon hillside properties. Call (818) 818-4419 for a free consultation and estimate.

Start Your Brentwood Room Addition

Call: (818) 818-4419
Email: info@aplaconstruction.com
CA General Contractor License #1136359

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