A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Moraga, CA
Moraga is one of the more complicated places in Contra Costa County to build an accessory dwelling unit, garage conversion, or home addition. The hills, the older housing stock, and the town’s strict hillside development rules all shape what’s possible on a given lot, and they shape the price too. We’re Lodgewick ADU Builders, part of the Kingswell family of home-service companies, and we work throughout Moraga on projects that need real site knowledge rather than a generic plan. You can reach us at (707) 760-0502 to talk through what’s on your property.
Why Moraga Homes Are Different
Moraga’s housing stock runs heavily to 1950s through 1970s single-family ranch and split-level homes, most of them on generous hillside lots. That sounds like good news for an ADU until you start looking at what’s underneath. Many of these homes sit on older foundations, some on expansive clay soils, some on shallow bedrock. Drive through neighborhoods like Rheem Valley, Sanders Ranch, or Campolindo and you’ll see the same pattern: long driveways, sloped yards, and limited access for excavation equipment. A detached ADU on one of these lots often needs a geotechnical report before anything else happens, and in a meaningful share of cases the answer is a pier-and-grade-beam foundation rather than a simple slab. That adds cost and it adds time, but it’s the difference between a structure that stays put through a wet winter and one that doesn’t.
Moraga’s design review process is another layer. Because so much of the town is hillside with view corridors, the planning department treats each proposal as its own thing. Setbacks, height limits, and grading rules are looked at block by block, sometimes lot by lot. We’ve also seen summer heat in the Lamorinda valley push homeowners toward better insulation and heat-pump cooling than they originally budgeted for, and winter rains on steep slopes mean drainage and erosion control have to be designed in from the start, not added after the first storm.
Our Main Moraga Services
Most Moraga homeowners who call us are trying to solve one of three problems: adding living space to a house they’ve outgrown, converting a garage that’s really just storage, or building a separate ADU for family or rental income. Each service has its own Moraga page with full details and pricing.
Home Addition Contractor in Moraga
Home additions in Moraga are rarely simple bump-outs. The split-level and ranch layouts from the 1950s through 70s were not designed with expansion in mind, so tying a new foundation into an old one on a sloped lot takes real engineering. We handle everything from foundation matching to roofline transitions, and we flag the soil and drainage realities early so you’re not surprised later. For the full scope of what a Moraga addition involves, see our Home Addition Contractor in Moraga page.
Garage Conversion Contractor in Moraga
A garage conversion is often the fastest path to livable square footage in Moraga, especially on lots where a detached ADU would trigger heavy grading review. The catch is that many older Moraga garages were never insulated, have slab floors with no vapor barrier, and weren’t wired for anything beyond a door opener and a light. Converting one properly means bringing it up to current energy code, adding insulation, upgrading electrical, and often reinforcing the slab. Our Garage Conversion Contractor in Moraga page walks through what that costs and how long it takes.
ADU Builders in Moraga
Detached ADUs in Moraga are where the local terrain really drives the conversation. Hillside setbacks, view-sensitivity review, clay soil, and bedrock all come into play, and a prefab approach can sometimes reduce the amount of grading and site disturbance involved. We work with manufacturers like Boxabl, Plant Prefab, and Mighty Buildings where the lot allows, and we’re direct about when a custom build is the better call. Full details, including the design-review realities, are on our ADU Builders in Moraga page.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Moraga
On Moraga jobs we regularly spec James Hardie siding for fire resistance and durability through wet winters, and we work with Plant Prefab and Boxabl on detached ADU projects where a factory-built shell fits the site better than stick framing. Materials are ordered to the job, and any warranty claim on brand components goes through us, not a call center. See our brands for the full list.
Pricing for ADU Company in Moraga, CA
| Service | Typical range in Moraga |
|---|---|
| Detached ADU (prefab, 400 – 600 sq ft) | $180,000 – $320,000 |
| Detached ADU (custom stick-built, 600 – 1,000 sq ft) | $320,000 – $550,000 |
| Garage conversion (attached, 400 – 500 sq ft) | $120,000 – $210,000 |
| Garage conversion (detached) | $150,000 – $260,000 |
| Home addition (primary suite, 300 – 500 sq ft) | $200,000 – $400,000 |
| Home addition (family room, 250 – 400 sq ft) | $180,000 – $320,000 |
| Geotechnical report (on lots requiring it) | $4,000 – $10,000 |
| Pier-and-grade-beam foundation upgrade | $30,000 – $70,000 |
| Drainage and erosion-control package | $8,000 – $25,000 |
What pushes prices up in Moraga more than anything is the foundation work. A lot that needs piers and grade beams instead of a standard slab can add tens of thousands before framing even starts, and hillside grading plus expanded drainage requirements add their own line items. Every estimate we give is a written, line-item price before any work starts, and it doesn’t change at the door.
Neighborhoods We Serve in Moraga
We work throughout Moraga, from the flatter streets near the downtown corridor up into the hillside subdivisions where the grading and soils get more complicated. If you’re not sure whether your lot falls under hillside development rules, call and we’ll tell you what to expect based on your street.
- Rheem Valley
- Sanders Ranch
- Campolindo
- Moraga Country Club area
- Fernwood
For most Moraga projects we can get a site visit scheduled within a week, though hillside lots under design review typically move on the planning department’s timeline more than ours.
Service Area – Cities Near Moraga
In addition to Moraga, our crews serve several surrounding communities in the East Bay. If you’re in Orinda, CA, Oakland, CA, Emeryville, CA, or San Leandro, CA, the same Kingswell Guarantee applies: written price first, defined arrival window, clean job site, and a written guarantee on every project.
Serving Moraga, CA - Our Local Coverage Area
We’re based in the Moraga area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU Company in Moraga
Site visits usually happen within a week, but the Moraga planning and design-review process is the real variable. Hillside lots with view-sensitivity triggers can take several months in review before permits are issued. We handle the submittals and keep you posted on where things stand. Call (707) 760-0502 and we’ll give you a realistic timeline for your specific street.
Not every lot, but many hillside properties do. If your lot has expansive clay or shallow bedrock, the town will typically require one before approving foundation plans. We tell you early whether this applies to your property. Call (707) 760-0502 and we’ll walk through what your lot is likely to trigger.
State law preempts most HOA restrictions on ADUs, but there are still design standards, yard setbacks, and architectural review layers specific to communities like Sanders Ranch or the Country Club area. We navigate those with you. Call (707) 760-0502 to talk through what your HOA’s rules actually mean.
If you’re weighing an ADU, garage conversion, or addition in Moraga, the next step is a free estimate with a written price. Call Lodgewick ADU Builders at (707) 760-0502 and we’ll give you a real number before you commit to anything.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Moraga Customers Say
"The ADU came out beautiful and the permitting, which terrified me, was handled start to finish. They kept me updated every week so I was never wondering what was happening."
- Shauna Mills"Turned our detached garage into a little guest house. Clean crew, respectful of the neighbors, and no mystery charges at the end. Love how it turned out."
- Carmela Fontes"I was nervous about adding on but they walked me through every step and every cost before we started. No surprise change orders halfway through like I'd heard horror stories about."
- Eleanor Pratt
