Home Additions
Room additions, ADUs and second stories — engineered, permitted and matched to your house. Add the space your family needs without leaving the neighborhood you love.
Grow your home instead of moving
When an LA family outgrows its house, moving means giving up a low property-tax basis and a neighborhood you love. Adding square footage is usually the smarter math — and California’s ADU-friendly laws have made it more achievable than ever. The J Hammer designs and builds additions and accessory dwelling units that look original to the house and pass inspection.
Three ways to add space
- Attached room addition — a primary suite, a bigger kitchen and family room, or a home office that flows with the existing house. Foundation, framing, roof tie-in, HVAC extension and full finish.
- Garage conversion ADU — the budget door into ADUs, because the structure, slab and roof already exist. Insulation, kitchen, bath and a separate entrance turn it into a permitted dwelling.
- Detached ADU — a ground-up backyard unit with its own foundation and utilities: real rental income or multigenerational housing.
The permit reality
Additions go through standard plan check; ADUs ride a state-streamlined process most LA-area cities must approve within set timelines. Either way you need engineering, Title 24 energy compliance and a contractor who has run the gauntlet before. We handle drawings, calcs and the whole process end to end — it is half the job.
Matched to your home
A good addition does not look added. We match rooflines, stucco texture, window style and trim so the new space reads as part of the original house — inside and out. And permitted square footage appraises, so the investment shows up when you sell.