ADU Construction in Los Angeles
Los Angeles ADUs and garage conversions on engineered footings, with galvanized hold-downs tying each braced wall to its concrete. Aspenwell Construction.
Hot-dip galvanized hold-downs are the hardware we specify first for a Los Angeles ADU. Bolted to a threaded rod cast into the footing, each one keeps the end of a shear wall from lifting when the ground shakes, and its thick zinc coat stands up to the damp that gathers where wood meets concrete. A narrow unit fitted onto a city lot has short braced walls, and short walls lean hardest on those anchors.
What LADBS reads on the structural sheet
Plan check at LADBS compares the structural sheet with the shear wall schedule: which walls brace the unit, how their plywood is nailed and where every anchor sits. Inspectors later stand over the open footing trench to see its steel before any concrete arrives, and they come back to the bare frame before insulation hides it. We hang each hold-down rod in the forms from a plywood template so it lands inside the wall it serves. A rod poured an inch off its stud pack means drilling and epoxy, which then needs the inspector's approval on site.
Sill plates and the slab edge
Treated lumber goes under every wall that bears on concrete, held by anchor bolts with square plate washers so the sill cannot split along its length in a hard jolt. Sheathing on the braced walls follows the edge nailing the engineer calls for, and those nails are looked at before anything covers them. Outside, soil and mulch are kept below the sill line and the yard is shaped to fall away from the slab, so rain runs off into the garden and the framing above the concrete stays dry.
About our adu construction serviceEverything we do in Los Angeles
ADU Construction in Los Angeles: questions
A detached unit generally stands on a slab poured in one piece with deepened edges that act as its perimeter footing. If a soils report turns up weak or expansive ground, the engineer can push those edges deeper or switch to a framed floor lifted on short concrete walls. LADBS inspects the trench before the pour.
Sometimes. Many garage floors are a thin pad with a shallow curb under the walls, which carries a parked car and little else. We open the slab edge to see what is actually there. Wherever a new braced wall has to land, a fresh footing section is cut in and doweled into the old concrete.
It covers a single-story unit of 500 square feet or less, whether it stands alone, attaches to the house or takes over a garage. On a Los Angeles parcel much of the drafting time goes into the site plan, which has to show setbacks, the sewer route and any easement recorded against the lot.
ADU Construction in other cities
More we build in Los Angeles
Book an inspection in Los Angeles
Describe the house and what it needs. We look at the structure first and send the quote in writing.