ADU Construction in Calabasas
Calabasas ADUs attached or detached, each with its own braced walls and footings, ember-resistant details and city plan review handled for you.
"If an earthquake hits, will the new unit pull away from our house?" A Calabasas owner may raise that on a first walk of the lot, and the honest answer depends on how the unit is joined. A detached ADU stands on its own footings with its own braced walls. An attached one either shares framing with the house, so both move together, or stands with a narrow gap and a flexible joint between them.
Attaching without borrowing strength
An attached Calabasas ADU must carry its own lateral load unless the engineer checks the main house as well. We usually design the unit to stand alone, with its own shear walls and hold-downs, and connect it to the house only with flashing and a sealed joint that lets each side move. Where the plan does tie the two together, the engineer checks the house walls that would take the added force, and we may add bracing or anchors to the existing foundation.
Sealing the joint on a mapped lot
A Calabasas lot on the fire hazard map raises one more question at the joint between unit and house: embers can lodge in any gap. We close it with a noncombustible backer and a sealant the fire rules accept, and cover it with metal flashing. The rest of the exterior follows the same rules, with a Class A roof, ember-resistant vents, tempered glazing and a clear strip at the base. The City of Calabasas reviews the plans and inspects the work through final.
About our adu construction serviceEverything we do in Calabasas
ADU Construction in Calabasas: questions
A Calabasas ADU usually stands on reinforced concrete, a slab whose edges are thickened into footings, or a stem wall carrying a raised floor. The soils report and the engineer set the depth and the steel. On a sloping lot, the design may switch to stepped footings or drilled piers. Bolts for each braced wall are cast into the pour.
Possibly, after a look under the slab edge. We expose the garage footing at several points, measure its depth and width, and check whether bolts already hold the sill. A Calabasas garage with a sound, continuous footing may need only epoxy anchors and new panels. A shallow one gets new concrete first.
One-story units of no more than 500 square feet fall under it. Because a Calabasas lot can be mapped for fire hazard, the wall drawings and the site plan get the reviewer's attention, and the package handles both. A bigger or two-story design is priced once we have reviewed the lot and plans.
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Describe the house and what it needs. We look at the structure first and send the quote in writing.