ADU Construction in Brentwood
Brentwood ADUs anchored with corrosion-resistant hardware, braced to resist earthquakes and detailed for LADBS review and the fire hazard map.
Stainless steel hold-downs and anchor bolts are a choice we make for a Brentwood ADU, because a lot that catches salt-laden air can slowly eat plain galvanized steel. Those small parts hold the walls to the footing in an earthquake, so their strength has to last as long as the building. The same thinking sets the nails in the shear panels and the straps over the roof framing.
Slab or raised floor
A Brentwood ADU can sit on a slab-on-grade with thickened edges or on a perimeter footing with a short cripple wall and a raised wood floor. A slab is simpler to brace because the wall plates bolt straight to concrete. A raised floor gives room for plumbing and keeps wood clear of damp soil, but its cripple walls need plywood bracing and their own anchor bolts. The engineer picks the system from the soils report and the room layout, and we build it exactly as detailed, with inspections ahead of each pour.
Glass and siding near the fire map
Fire hazard maps take in sections of Brentwood. A unit on a mapped parcel may need dual-pane windows with a tempered pane, siding that will not catch, a Class A roof and vents that stop embers. Cement plaster over plywood suits both rules, since it resists embers and the plywood behind it braces the wall. Brentwood permits are issued by LADBS after plan review. The lot may or may not be in the coastal zone, which we check before any drawing starts.
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ADU Construction in Brentwood: questions
Concrete reinforced to the engineer's design, poured either as a slab with deepened edges or as a continuous footing under a raised wood floor. The soils report for the Brentwood lot sets depth and width, and the steel is sized for gravity and earthquake loads together. Hold-down anchors are cast in wherever a braced wall ends.
A garage can sometimes keep its footings if they are deep and continuous enough. We dig down beside the slab edge to measure them, check for anchor bolts in the sill and look at the condition of the concrete. Where any of that falls short, the engineer details new concrete beneath the shear walls before the room is framed out.
The structural sheet and the site plan carry a Brentwood review, since the parcel may touch the coastal zone and the fire map, and the package covers both for one-story units at or under 500 square feet. Adding a second story or more floor area means a price set after we review the lot.
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Book an inspection in Brentwood
Describe the house and what it needs. We look at the structure first and send the quote in writing.