Alhambra ADU Construction with walls that breathe
Alhambra ADUs with a ventilated rainscreen behind the siding, shaded glass and ductless comfort for an inland urban lot, reviewed by the city.
A ventilated gap behind the siding is the first material choice we make for an Alhambra ADU on an inland urban lot. Thin furring strips hold fiber cement boards off the wall, so air heated by hard sun rises and escapes at the top, and any water that slips past drains out at the bottom. The wall behind stays cooler and drier, which helps a small unit hold an even temperature for a parent who spends most of the day at home.
Inside the wall
Behind the furring, a water-resistive barrier wraps the sheathing and laps over flashing at every window head, so water runs out and down. Insect screen closes the top and bottom of the gap. Mineral wool fills the stud bays, and a pale siding color reflects more sun than a dark one would. Windows use low-e double glazing, and a wide overhang shades the glass that takes afternoon light. Inside, a ductless heat pump with one head in the main room and one in the bedroom keeps both comfortable with no ducts in a hot attic.
City review and the quote
Each stage of the work, from footings to final, gets a city inspection once Alhambra approves the plans. Where a wall sits close to a lot line, its fire rating and window limits come into play, and the rainscreen assembly is drawn to suit that rating. Written corrections from plan check are answered on the set. Pricing arrives in two steps, plans package first and the build after the city signs off, with the siding system broken out so the choice is clear.
ADU Construction in Alhambra: what families ask
Living space out back can be a whole home in Alhambra, with cooking, bathing and an entry that belongs to whoever lives there. For a parent, the bedroom sits near the bath with a clear route at night. For a grown child, a pantry, a desk and storage for weekend gear make it feel like a first apartment.
An existing Alhambra garage with a sound slab and walls converts with less new work, and its shell can take the rainscreen and insulation like any new wall. A detached unit gives freedom to aim windows and set overhangs that shade the glass, which a garage fixed in place cannot always offer. We look at both on the lot.
Limits for an Alhambra unit come from the city's code, inside the bounds of state ADU law. Attached units are usually measured against the floor area of the house, detached ones to a city cap, and a junior unit carved from the house tops out at 500 square feet. Setbacks and lot coverage can trim the outline, so we check the parcel before drawing.
ADU Construction in other cities
Other projects we take on in Alhambra
Your Alhambra project, start to finish
Tell us about the house and the space you need. We reply by phone or email to plan a visit.