ADU Construction in Santa Monica
Santa Monica ADUs placed by the depth of the house sewer, with corrosion-resistant anchors and hold-downs for the coastal air. Aspenwell Construction.
How deep the house sewer runs where it leaves the foundation decides how far back a Santa Monica ADU can stand. Waste has to fall toward that line all the way from the unit's farthest drain, so a deep lateral lets the unit sit at the rear of the lot, while a shallow one pulls it closer. We open the cleanout, run a camera and measure that depth before the footprint is drawn.
Keeping the drains falling
Drain pipe needs a steady slope of about 1/4 inch per foot, and the longer the run, the more height it uses up. If a shallow lateral leaves too little fall for a slab-on-grade unit at the back, there are a few ways through it. A raised wood floor on stem walls lifts the drains above the yard and buys the slope back, and it also leaves pipes reachable later. A pump basin is the fallback when neither placement nor floor height can solve it, and the plans show whichever route is chosen.
Hardware for damp coastal air
Santa Monica is in a coastal zone, so salt in the air reaches the metal that ties a unit together. Hold-downs, anchor bolts, straps and the nails and screws that fix them come in hot-dip galvanized or stainless steel, and dissimilar metals are kept apart so one does not eat the other. The City of Santa Monica can tell from the address whether a lot is inside the state coastal zone. If so, coastal approval may be required on top of the building permit, and the schedule leaves room for it.
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ADU Construction in Santa Monica: questions
Either a reinforced slab with deepened edges or a framed floor raised on stem walls of concrete, and the sewer depth often tips the choice. The engineer sizes the footings from the soil. Anchor bolts and hold-down rods set in the concrete are specified in coated or stainless steel for the coastal setting.
If the existing footing is deep enough under the walls that will brace the room, new anchors and sheathing may be all it needs. Where only a shallow edge holds the walls, fresh concrete goes in first. The new bathroom drain also has to reach the house sewer, which we check at the same visit.
Single-story ADUs no larger than 500 square feet, whether detached, attached or a converted garage. A Santa Monica set leans on the site plan and the plumbing layout, which together show where the unit sits and how its drains reach the house sewer. Construction is quoted after the lot visit.
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Describe the house and what it needs. We look at the structure first and send the quote in writing.