ADUs & Additions in La Verne

City of La Verne Community Development Department, Building and Safety Division. Building permits are issued by the Building and Safety Division of the Community Development Department at 3660 D Street, with applications taken through the city's online permitting portal, and La Verne builds to the Los Angeles County building and residential codes, which it adopts by reference. Pools, spas, patios, gazebos and fencing on single-family lots are exempt from precise plan review, but every pool and its mechanical equipment must sit at least five feet from the property line, and no pool may be filled with water until its fences and gates have been installed and have passed the city's final inspection. New development on land identified as hillside on the city's Land Use Map falls under the Hillside Development Overlay Zone (Chapter 18.68), which prohibits development on slopes of 25 percent or greater outside narrow exceptions and bars conventional mass grading on slopes above 10 percent in favor of landform and contour grading. We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing plan check.

The Lordsburg townsite, platted in 1887 and 1888, keeps much of its grid of lettered and numbered streets, with alleys behind the older blocks, block after block of bungalows built between 1900 and 1930, and original residential lots of 50 by 140 feet around the core; post-war tracts on its east side traded the grid for cul-de-sacs. In Lordsburg, remodels and expansions that strictly follow the specific plan's preservation standards may reach a 0.45 floor area ratio, and one-story homes up to 45 percent lot coverage, against the 35 percent that La Verne's residential districts otherwise allow. In the hillside areas, development is limited to flat or gently sloping ground, and fill may not exceed an average depth of five feet, nor cuts an average height of eight feet, within any building pad, lot or slope. One local condition that shapes the work: Unless a registered geotechnical engineer specifies otherwise, La Verne's building code treats every foundation in the city as sitting on expansive soil, and where no engineered design is approved it prescribes continuous reinforced footings at least 24 inches deep at exterior walls and 18 inches at interior ones, which bears directly on ADU and addition foundations.

All of it, including Old Town La Verne, Lordsburg, Sierra La Verne and Marshall Canyon. Our crews run every job out of our Cahuenga Pass base in Los Angeles, with our own people on site.

Detached ADU: generally $150,000 to $400,000+ across Southern California. What moves it is square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build. We give line-item pricing after seeing the site rather than quoting a number over the phone.

Plan a realistic year. Design and engineering typically take one to three months, city plan check and corrections add several more, and construction usually runs four to eight months depending on size and site access.

Usually yes, and often substantially, because the foundation, walls and roof already exist. The trade-offs are that you lose the garage, and older slabs and framing sometimes need upgrading to meet current code.

California ADU law is designed to allow long-term rental, and an ADU is one of the few ways to add rentable square footage to a single-family lot. Short-term rental rules vary by city, so confirm your local ordinance before counting on that income.

Yes. Plans, engineering, Title 24 and the city submittal are all handled in-house, including responding to plan-check corrections. That is a service we sell on its own, so it is not something we hand off.