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Adding an accessory dwelling unit (ADU) – a second, smaller home on your existing property – on Fresno acreage usually costs between $180,000 and $360,000 for a detached build, while a garage conversion or junior ADU (JADU) inside the existing house runs $120,000 to $220,000. Those are real ranges we’ve seen on Fig Garden and Sunnyside lots over the past three years, not national averages. If your property sits in unincorporated Fresno County rather than city limits, your permit path changes, and so does the price. Call (559) 354-0579 and we’ll walk the lot with you before you commit to anything.
We’re Lodgewick ADU Fresno, part of the Kingswell family of home-service companies, and our ADU Builders team works exclusively on accessory dwellings, garage conversions, and home additions across Fresno, Clovis, Madera, Sanger, and Fowler. Russ Delmar leads the Fresno crew, and he’ll be the one answering your first call.
Why Lodgewick ADU Fresno Is Fresno’s Preferred ADU Builders Company
Fresno acreage owners come to us because we don’t treat a county lot on Shepherd Avenue the same as a Tower District bungalow. Russ Delmar has walked hundreds of Fresno lots, from tight 5,000 sq ft city parcels to half-acre Sunnyside spreads where the well head sits a hundred feet from the house. That local knowledge shows up in the quote. A builder who only works inside city limits won’t know to check for septic tank clearances before pricing your detached ADU, and that omission costs homeowners five figures later.
Every Lodgewick ADU Fresno project runs under The Kingswell Guarantee. You get a written price before any work starts, a defined arrival window, a clean job site, and a written guarantee on the build. If something isn’t done right, we come back and make it right within 365 days – that’s the 365-Day Done Right Promise, and it’s in writing on every contract. Our technicians are background-checked and uniformed, so when a crew shows up at your Fresno property, you know exactly who’s walking onto your lot. And when you call with a question about your build, a live person answers. Not a voicemail. Not a chatbot. Every hour of every day.
We’re familiar with the leading ADU brands and materials that work well on Fresno lots – Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie siding. We match the right material to your lot, your budget, and your timeline, not the other way around.
JADU in Fresno
A JADU – junior accessory dwelling unit – is a smaller living space built inside your existing home’s footprint in Fresno, typically a converted bedroom, den, or attached garage that gets its own kitchenette, entrance, and bathroom. On Fresno acreage, the JADU question usually comes up when a homeowner wants rental income or a space for aging parents but their lot can’t support a detached build because of well and septic clearance setbacks. A JADU sidesteps those county requirements because it lives inside the existing dwelling, not as a separate structure needing its own foundation and utility clearances.
In unincorporated Fresno County areas like Fig Garden and Sunnyside, a JADU typically runs $120,000 to $180,000 depending on whether the space needs a new electrical subpanel, its own water heater, or sound insulation between the main house and the unit. Older ranch homes from the 1960s and 1970s often need a service panel upgrade from 100 amps to 200 amps, which adds $4,000 to $7,000 to the total.
JADU vs. Detached ADU on Fresno Acreage
If your lot has a well and septic system, the math changes fast. A detached ADU must meet county setback requirements – often 100 feet from the well head and a set distance from septic tank and leach field lines. A JADU skips all of that because it doesn’t add a new foundation footprint. That’s why many Fresno acreage owners choose a JADU first, bank the rental income, and plan a detached unit later once they know their clearance situation.
Plumbing and Sewer for JADUs
A JADU inside a Fresno house with no separate sewer line ties into the existing waste stack. That’s usually straightforward, but on 1970s-era ranch homes with cast-iron drain pipes, we recommend a camera inspection first. Cracked cast iron under a slab is a $6,000 to $12,000 repair, and you want to know about it before drywall goes up, not after.
ADU Plans in Fresno
ADU Plans are the architectural drawings and site documents Fresno County and the City of Fresno require before you can pull a building permit for any accessory dwelling unit. On acreage in Fresno, these plans aren’t just floor layouts – they include grading and drainage studies, septic and well clearance diagrams, and equipment access notes that a tight city lot would never trigger. A full ADU Plans package for a Fresno county lot typically costs $8,000 to $15,000, depending on whether the property is in city limits or unincorporated county, and whether a structural engineer needs to sign off on an existing garage conversion.
Where most homeowners get burned on plan costs is when the first drafts ignore county setbacks. A well-intentioned designer draws a 750 sq ft ADU 40 feet from the well head, the county kicks it back, and now you’ve paid for revised drawings. We scope the clearance surveys before the plans are drawn, not after.
Site Plans and Perc Testing
On a half-acre Sunnyside lot, the county will ask for documentation that your existing septic system can handle the additional bedroom and bathroom load. That means a perc test, usually $1,500 to $3,000, and a septic tank inspection, another $600 to $1,200. We coordinate all of it with the Fresno County Environmental Health department and fold those numbers into your written quote.
Grading, Drainage, and Equipment Access
Open-lot grading on Fresno acreage is a line item, not an afterthought. If your property has no curb cut wide enough for a flatbed bringing Boxabl modules or a skid steer for trenching, you’re looking at $8,000 to $15,000 for a temporary access easement and grading before any framing starts. We walk the lot with a transit before quoting so that number is in the written price, not added later.
Trusted Brands We Service in Fresno
We work hands-on with the ADU brands that hold up to Fresno’s climate – James Hardie fiber cement siding for UV and heat resistance, Abodu and Cover for fast prefab deliveries on acreage, and Dvele for high-performance envelopes that keep cooling bills manageable in July. We keep local material suppliers close, which means when a delivery lands at your Sunnyside lot and a panel is scratched or a module needs re-sealing, we’re not waiting a week on a truck from out of state. Our Fresno crew stocks sealants, flashing, and touch-up kits locally, so a fix happens in days, not weeks.
Common ADU Builders Problems We See in Fresno Homes
- Assuming city zoning covers the lot. Plenty of Fresno addresses are actually unincorporated Fresno County – especially in Fig Garden and Sunnyside – and the county path triggers septic and well setbacks that city-only builders never survey. A permit application gets rejected, and the homeowner pays for redesign.
- Underquoting because there’s no equipment access. A flatbed with a prefab module or a skid steer for foundation work needs a real path onto the property. No curb cut, no quote. We flag this on the first site visit, not after the contract is signed.
- Dust intrusion on open lots. Fresno summers are dry, and grading a half-acre lot kicks up dust that works into wall cavities, HVAC ducts, and insulation. We run dust sealing and scheduled watering on every acreage build, because a failed insulation inspection over dust contamination delays the whole project.
- Older homes, older panels. Ranch houses from the 1950s through the 1980s often carry 100-amp panels. A new ADU with a mini-split, kitchenette, and laundry pulls more than that. We price the panel upgrade in the first written quote, not as a change order.
Pricing for ADU Builders in Fresno, CA
A detached ADU on Fresno acreage runs $180,000 to $360,000 depending on size, site prep, and whether you’re doing a site-built custom unit or a prefab install from Abodu, Cover, or Boxabl. A garage conversion in the Tower District or a JADU inside a Fig Garden ranch home lands between $120,000 and $220,000. The big swings on acreage lots come from three things: septic and well clearance work, equipment access and grading, and whether the existing panel can carry the new load. Every Lodgewick ADU Fresno quote includes those line items in writing before work starts. Call (559) 354-0579 for a free estimate – Russ Delmar will meet you on the lot.
We Also Serve Cities Near Fresno
Our Fresno crew covers the surrounding Central Valley cities, including Clovis, Madera, Sanger, and Fowler. If your property sits on acreage just outside Fresno city limits – maybe off a county road with a well and septic – the same rules and ranges apply, and the same crew handles the build. Learn more about how we serve the region on our Fresno page, or call for a site visit.
Serving Fresno, CA - Our Local Coverage Area
We’re based in the Fresno 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 Builders in Fresno
Fresno County requires a minimum distance between any new ADU foundation and your septic tank, leach field lines, and well head – commonly 100 feet from the well on acreage in Sunnyside and Fig Garden. If your half-acre lot can’t meet those clearances where you wanted the unit, the ADU either shrinks, shifts to a different corner, or becomes a JADU inside the existing house. We survey the clearances before we draft ADU Plans, so you know the buildable envelope on day one. Call (559) 354-0579 and we’ll pull your county records.
Yes, and we do it often in older Fresno neighborhoods like the Tower District – but a pre-1970 garage conversion usually requires a Garage Conversion Contractor in Fresno to review the slab and framing, plus a full electrical and plumbing upgrade. Garages from that era often have unreinforced slabs and no insulation, so the conversion cost lands on the higher end of the $120,000 to $220,000 JADU range. The 365-Day Done Right Promise covers the conversion, and we put that guarantee in writing before we start.
Fresno’s dry summer grading kicks up fine dust that settles inside wall cavities, ducts, and insulation, which can fail a county inspection or leave you with dirty air handlers on day one. We run dust sealing, scheduled water suppression, and daily site cleanup on every acreage build. It’s a line item in the written price, not an upsell.
Yes. A prefab unit like Boxabl or Plant Prefab needs a level, compacted pad – usually gravel or engineered fill – and a clear path for the flatbed and crane to set the modules. On Fresno acreage with no curb cut, that can mean an $8,000 to $15,000 grading and access easement before the first module arrives. We scope that during the first site walk, so the prefab quote you get is the price you pay.
A JADU that ties into the existing house sewer typically saves you $10,000 to $20,000 compared to a detached ADU needing its own septic connection or sewer tap. On an acreage lot where a separate line would require trenching across the property or a new septic field, the savings can push $25,000. Call (559) 354-0579 for an exact quote – estimates are free, and the number we give you is the number you’ll see on the contract.
Written by Russ Delmar, Owner at Lodgewick ADU Fresno, serving ADU Builders in Fresno and surrounding Central Valley communities.
