ADUs and additions, Playa Vista, Los Angeles County

ADU Construction in Playa Vista

Planning the exterior of a Playa Vista ADU for damp air near the water: siding, fasteners, window flashing and how each ADU type changes that work.

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The outer skin of a new unit, meaning its siding, window openings and the flashing between them, gets the most planning attention on a Playa Vista ADU. Lots near the water take damp air, and it works on fasteners, metal trim and any seam left open. We specify that skin early, then weigh how detached, attached, garage conversion and JADU layouts would each carry it.

Materials for a damp exposure

Fiber cement or a well sealed stucco system holds up to moisture better than raw wood siding. Fasteners and hangers are stainless or hot dipped galvanized, since plain steel can rust and stain the finish. Windows come with vinyl or fiberglass frames, and each opening gets a sill pan and layered flashing that sheds water outward. A rainscreen gap behind the siding lets trapped moisture dry. For a garage conversion, the existing walls are opened at a few points so hidden rot or corrosion can be found and priced before the drawings are final.

How each unit type changes the exterior work

A detached unit needs a full new envelope on every side, so its wall and window spec drives a larger share of the cost. An attached unit adds new walls on three sides plus a tie-in where it meets the house, and that junction is flashed with extra care. A JADU uses rooms already inside the home, so exterior work may be limited to a new entry door. Plans in Playa Vista go to LADBS, and a lot by the water can bring a further state review. Lots in Mar Vista, Venice and Culver City get the same envelope review from us.

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