Diamond Bar ADU Construction at the Right Height
Diamond Bar ADUs set at the right floor height, with stucco kept clear of the soil, rated vents and tempered glass in a hardened shell.
The gap between the bottom edge of the main house's stucco and the soil is the first thing our tape reads on a Diamond Bar lot. Stucco ends at a metal weep screed that has to stay clear of the ground so trapped water can leave the wall. If the yard has been built up against the house, the new unit's floor height and the grading between the buildings have to restore that clearance.
Setting the unit's floor
We set the finished floor of the ADU high enough that its own weep screed sits clear of the soil and its slab edge stays out of planting beds. That height decides how many steps lead to the door and whether a ramp fits. Around the slab, the ground falls away on every side, and where the unit and the house face each other, a shallow swale between them carries water toward an outlet. A set of spot heights taken across the yard tells us how much soil has to move to make that work.
Stucco that stays dry
On the unit, three-coat stucco goes over two layers of water-resistive barrier and metal lath, which gives a noncombustible wall finish with a drainage path behind it. The weep screed at the base lets any water that gets behind the stucco drip out. Around windows and doors, flashing laps in the right order so water always runs outward. Where the house's stucco sits too low, we lower the soil along it and add a drain, which keeps the older wall from wicking moisture into its framing.
ADU Construction in Diamond Bar: common questions
A Diamond Bar lot falls under the wildfire chapter only when its parcel appears on the state's hazard map, which we look up before design and the city can confirm. We build the unit with a stucco or fiber cement skin, tempered glazing and listed vents regardless, since those parts also hold up to hard sun.
Spot heights, the unit's finished floor and the swale between the two buildings all go on the Diamond Bar site plan, which is where this yard's questions get answered. The package is drawn for one story under the size cap, and a larger design gets its own quote.
Yes, given room on the lot and the city's sign-off on sequence. With both buildings going up together we can set their floors and the grading between them as one plan, so neither wall ends up with soil against its stucco. We measure the yard for both footprints first.
More work we do in Diamond Bar
Plan your project in Diamond Bar
Tell us about the house and the adu construction work. We reply about a walk-through and a written scope.