A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Pleasant Hill, CA
Most ADU projects in Pleasant Hill run between $180,000 and $320,000 for a detached unit before site work, and the biggest variable on your lot is usually the sewer line, not the structure itself. We’re Sutton ADU Builders, and we work on the post-war ranch and split-level homes that define this city, where flat rear yards make for straightforward foundations but 1950s-era plumbing often needs attention before framing starts. Call (831) 272-7212 for a free estimate and a written price before any work begins.
Why Pleasant Hill Homes Are Different
Pleasant Hill’s housing stock tilts heavily toward single-story ranch and split-level homes built between the late 1940s and early 1970s. Most sit on concrete slabs with generous rear yards, which sounds ideal for a detached ADU, and it often is. The catch is what’s underground. Sewer laterals on these properties were sized for one bathroom and a kitchen, not two dwellings. A lateral upgrade can add $8,000 to $25,000 depending on depth and distance to the city main, and we’re upfront about that cost before you sign anything.
The climate matters too. Pleasant Hill gets hot, dry summers and cool, wet winters. An ADU without proper insulation and cross-ventilation becomes an air-conditioning bill that never quits. We frame with that in mind: roof venting, window placement for prevailing breezes, and drainage that keeps the rainy season from pooling water against your new foundation. The city’s ADU Accelerator program helps move plans through permitting quickly, which means fewer months of carrying costs on a project that isn’t producing rent yet. In neighborhoods like Gregory Gardens and Poet’s Corner, where lots run deep and flat, we regularly see permits clear in three to five weeks when the plans are clean the first time.
Our Main Pleasant Hill Services
Most Pleasant Hill homeowners call us for one of two reasons: they want a detached ADU in the back yard, or they want to expand the footprint of the house they already live in. Each service below has its own Pleasant Hill page with local pricing and details.
Home Addition Contractor in Pleasant Hill
A home addition in Pleasant Hill usually means extending off the back or side of a ranch home, tying the new roofline into the existing one and matching stucco or board-and-batten siding so the addition doesn’t read as an afterthought. We handle the site plan, structural work, and finish carpentry, and we coordinate with the city’s building department directly. On slab-on-grade homes, we check the existing foundation for movement before designing the connection point, which prevents the hairline cracks that plague rushed additions here. Home Addition Contractor in Pleasant Hill
ADU Builders in Pleasant Hill
Detached ADUs in Pleasant Hill work particularly well because the lots are big enough to keep privacy between the main house and the new unit. We build stick-frame ADUs and also install prefab units from brands like Boxabl, Plant Prefab, and Tuff Shed, which can shorten on-site time to a few weeks. The city’s pre-approved ADU Accelerator plans mean a well-prepared project can move from permit to foundation quickly, but the sewer work and drainage planning still need to be done right. ADU Builders in Pleasant Hill
Room Addition Contractor in Pleasant Hill
A room addition in Pleasant Hill is often a single bedroom and bathroom off the back of the house, or a family room that opens onto the yard. These projects touch the existing roofline, which means working around the low-pitch roofs common on mid-century ranches here. We tie into the existing structure, match the ceiling height, and insulate to current code so the new room doesn’t bake in July or chill in January. Room Addition Contractor in Pleasant Hill
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 Pleasant Hill
We work with several ADU product lines that fit Pleasant Hill’s lot sizes and permit requirements, including Boxabl, Plant Prefab, Tuff Shed, and James Hardie exterior systems. See our brands page for the full range. Lead times on prefab units vary by manufacturer, but we coordinate delivery so the foundation and utilities are ready before the unit arrives.
Pricing for ADU Company in Pleasant Hill, CA
| Service | Typical range in Pleasant Hill |
|---|---|
| Detached ADU (400 – 600 sq ft, stick-frame) | $180,000 – $320,000 |
| Detached ADU (prefab, turnkey) | $160,000 – $280,000 |
| Garage conversion to ADU | $120,000 – $220,000 |
| Sewer lateral replacement or upgrade | $8,000 – $25,000 |
| Foundation and site prep (flat lot) | $15,000 – $35,000 |
| Foundation and site prep (sloped lot) | $30,000 – $60,000 |
| Full kitchen in new ADU | $25,000 – $55,000 |
| Full bathroom in new ADU | $18,000 – $40,000 |
| Home addition (attached, 200 – 300 sq ft) | $100,000 – $180,000 |
| Room addition with bathroom (300 – 400 sq ft) | $140,000 – $240,000 |
| James Hardie siding (new build or addition) | $15,000 – $40,000 |
Prices in Pleasant Hill move up when the sewer lateral needs to be replaced, when the lot has slope that requires retaining walls, or when the existing electrical panel can’t handle a second dwelling’s load. Our written price is delivered before any work starts, and it includes exactly what we agreed to. No change orders handed to you as a surprise at the end of the month.
Neighborhoods We Serve in Pleasant Hill
We work across Pleasant Hill, and the neighborhoods below represent the areas we’re in most weeks. Response time for an estimate is typically within two to three business days, depending on the season.
- Gregory Gardens
- Poet’s Corner
- Sequoia Hills
- Pleasant Hill Estates
- Valhalla
Service Area – Cities Near Pleasant Hill
Our crews serve Pleasant Hill and the surrounding communities across Contra Costa County. If you’re in Walnut Creek, CA, Alamo, CA, Benicia, CA, or San Pablo, CA, we can schedule a free estimate and bring the same written-price and Threshold Verified crew standards to your project.
Serving Pleasant Hill, CA - Our Local Coverage Area
We’re based in the Pleasant Hill 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 Pleasant Hill
With the city’s ADU Accelerator program, a pre-approved plan can go from application to issued permit in three to five weeks. Custom designs take longer. We prepare drawings that meet the city’s requirements the first time, which avoids resubmission delays.
State law limits what HOAs can restrict regarding ADUs, but if your neighborhood has an HOA, you should check its governing documents early. We’ll flag any likely review requirements during the estimate so there are no surprises mid-project.
We scope the lateral before we ever break ground. If it’s the original 1950s clay pipe, we’ll include a replacement in your written price rather than discovering it mid-build. The cost is itemized, not buried.
Yes. You’ll receive the name and photo of every crew member before they arrive, and they’ll show a photo ID badge at the door. The Threshold Standard applies to every visit, from the first estimate to the final walkthrough.
Call (831) 272-7212 to schedule a free estimate. We’ll walk your lot, talk through what your Pleasant Hill property can support, and hand you a written price before anything gets signed.
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 Pleasant Hill Customers Say
"Every crew member was vetted and carried a badge, which matters when they are around your family for months. Tidy site every day."
- Daniel F."Insulated the walls and ceiling properly. It stays comfortable even in July."
- Tamika W."They handled the drawings and the permit paperwork for us. All I had to do was pick the finishes."
- Rosa M.
