ADU Construction in Altadena
Altadena ADUs placed around the sewer lateral, panel and gas meter of an older house, with county permits and ember-resistant construction details.
Where the sewer lateral leaves an Altadena house can decide where the ADU goes. Waste from the unit has to fall by gravity to that line, so a spot well below it may need a pump, and a spot far from it adds a long trench. We find the lateral with a camera and a locator, check the main panel and the gas meter, and sketch a footprint near those connections that leaves the older house's original walls alone.
County review on a fire hazard lot
Permits for an Altadena unit come from Los Angeles County, which reviews building work in unincorporated communities. On an Altadena parcel that the state maps for fire hazard, and some are mapped, the reviewer checks ember details closely: roof class, vent screens, siding, decking and the glass in every window. Gas service enters that conversation too. An all-electric unit with a heat pump avoids upsizing an old gas meter and keeps a gas pipe out of the trench. We lay out both paths in writing so the choice is made on paper first.
Where the older house sets limits
The main house decides more than the look. Its panel location tells us which side of the lot is easier to feed, and its foundation type tells us how close new footings can come. If it still has knob-and-tube circuits or galvanized pipe, we note what an upgrade would touch, since replacing a service can mean opening a wall. Plaster and trim near the panel are protected, then patched to match when work reaches them. The unit itself borrows the main roof pitch and the window proportions of the house.
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ADU Construction in Altadena: common questions
Each utility gets its own check. The panel is load-calculated with the unit's appliances added, the supply pipe from the meter is checked against demand from two kitchens and two baths, and the sewer lateral is filmed from the cleanout out to the street. If the gas meter is small, the written scope compares an all-electric unit against a meter upgrade.
Sometimes the old garage is the better start, and sometimes a new building is. We check the slab, the framing, the roof and how close the walls sit to the lot lines. On a fire hazard lot, a conversion also brings the shell up to the ember rules, which can mean new cladding and a new roof.
We photograph and measure the house before drawing anything: roof slope, rafter tails, siding exposure, window grids and the width of the casing. The unit repeats those at a smaller scale. Where fire rules exclude a wood detail, a fiber cement or metal version carries the same line.
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Talk to us about your house in Altadena
Send the details and we will set up a walk-through and a written scope.