Fast, Reliable New Detached ADU Across Paradise
A new detached ADU in Paradise, CA typically costs $185,000 to $310,000 all-in, from the first site visit through final inspection, depending on size, Chapter 7A fire compliance, and what we find underground. Most projects move from signed contract to building permit submittal in 4 to 6 weeks when we bundle the ADU permit with your primary dwelling rebuild. If you’re weighing a one-bedroom or two-bedroom unit on a cleared lot, call (971) 497-2402 and we’ll walk the parcel with you and name a written price before any work starts.
We know Paradise not as a satellite market but as the specific place it is: a town rebuilt from a fire that took roughly 95% of its structures. That changes everything about how an ADU gets designed, permitted, and built here. The legal baseline is Chapter 7A Wildland-Urban Interface compliance. The site conditions are post-clearing conditions, not aging suburban lots. And the permitting path is a concurrent submittal the Town allows when the primary rebuild and the ADU move as one package. We’ll cover each of these in the sections below because they’re the line items that determine your real cost and schedule.
Why Ellery ADU Studio Is Paradise’s Preferred New Detached ADU Company
Ellery ADU Studio has operated as a design-build studio since 2015, and that model matters more in Paradise than almost anywhere else. A New Detached ADU on a fire-cleared lot cannot tolerate the designer-versus-builder blame gap. When the drawings, permit set, and construction sit in one contract at one written price, there is no one to point at when a Chapter 7A detail gets missed. The drawings are our scope, and the scope is locked before we mobilize.
Our work in Paradise is documented on every visit. Clients receive a photo record of what was found, what was opened, what was poured, and what passed inspection. That documentation matters when a project involves trenching through ground that may still hold remnants of the pre-fire gas, water, or septic infrastructure. We have pulled damaged laterals out of the ground on Clark Road and Skyway-adjacent parcels, priced the repair in writing, and kept the schedule moving. Under Clause 5 of The Haven Standard, the scope is locked at signing. No door-side upsells, no scope creep.
Nadia Ellery leads the studio, and clients deal with the same team from the first pricing conversation through final inspection. We coordinate prefab systems from brands including Abodu and Cover inside the same single contract, so a modular unit never turns into a finger-pointing exercise between a factory and a field crew. The 365-Day Done Right Promise applies in writing: if the finished ADU is not built to the permitted drawings, we make it right.
Our New Detached ADU Services in Paradise
Custom Built ADU
A custom-built detached ADU in Paradise starts with a site walk and a utility scan. We map the existing or planned sewer lateral, the electrical service path from the street or pole, and any gas line that survived or was re-run after the Camp Fire. Then we draw the unit to fit the parcel and the primary home’s rebuild envelope, not a stock plan forced onto a slope. Custom-built one- and two-bedroom units in Paradise typically run $210,000 to $310,000 depending on finish level and Chapter 7A cladding choices.
Prefab ADU Installation
Prefab doesn’t skip Paradise’s fire requirements. A panelized or modular shell still needs a Chapter 7A-compliant envelope once set: Class A roofing, ember-resistant vents with 1/16″ mesh screening, and ignition-resistant siding at the lower exposure zones. We specify and coordinate Abodu, Cover, and Dvele systems and handle the site work, foundation, utility connections, and finish trade coordination under one contract. Prefab ADU installation in Paradise runs $185,000 to $265,000 depending on unit size and site access.
Modular ADU
Modular units on Paradise’s steeper foothill lots present real crane and access questions that flat-lot contractors never see. A 1,200-square-foot module set on a 2,100-foot-elevation parcel off the main roads requires a site plan that accounts for grade, turn radius, and overhead clearance. We’ve done it in neighborhoods from the Bille Road corridor to lots near Honey Run Road. Modular unit pricing lands in the $195,000 to $280,000 range, with the written quote covering set, foundation, utility tie-ins, and Chapter 7A finish.
Studio ADU
A detached studio ADU of 400 to 600 square feet is the fastest permitted unit we build in Paradise, and for many owners it’s the right first move while the primary rebuild continues. Studio ADUs in Paradise hover around $165,000 to $205,000, but the biggest variable is not size; it’s what we hit underground when we trench for the utility connection. We carry a written allowance for utility repair in every Paradise contract because we’ve learned that a cleared lot is rarely an empty lot.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Paradise
We specify and coordinate prefab and modular systems from Abodu, Cover, and Dvele, and we detail James Hardie fiber cement siding on nearly every Chapter 7A-governed unit in the Paradise market. Hardie’s ignition-resistant product line satisfies the Wildland-Urban Interface requirement without forcing a utilitarian look, and we’ve standardized the flashing and vent details so the permit review goes smooth the first time. For Paradise clients, we order ember-resistant vent assemblies and 1/16″ mesh screening at contract signing, not mid-permit, because lead times on listed WUI products run longer than standard residential vents.
Common New Detached ADU Problems We See in Paradise Homes
- Underestimated Chapter 7A material costs. Out-of-area contractors quote standard siding and vents, then issue a change order when the Paradise permit requires ignition-resistant cladding and listed ember-resistant vent assemblies. We price these materials in the original written quote, per Haven Standard Clause 1.
- Pre-dig surprises on cleared lots. Buried remnants of pre-fire gas, water, or septic lines are common on Paradise parcels and can rupture during excavation. We run a utility scan and locate probe before any trenching begins, and we carry a written allowance if something damaged is found.
- Separate ADU permit filings that add months. The Town of Paradise allows ADU permit applications to be submitted concurrently with the primary dwelling reconstruction package. Filing the ADU later as a standalone project means a second plan review cycle and can trigger re-inspection of work already approved.
- Slope and drainage issues on foothill parcels. Paradise sits between 1,700 and 2,400 feet, and many lots slope enough that a standard slab-on-grade plan needs stepped footings and a drainage design the original parcel map never anticipated. We grade and drain to the finished condition, not the original contour.
Pricing for New Detached ADU in Paradise, CA
Here are the ranges we have written into Paradise contracts over the past several years, excluding the primary dwelling work:
- Studio ADU (400-600 sq ft): $165,000-$205,000
- 1-Bed Detached ADU (600-800 sq ft): $190,000-$250,000
- 2-Bed Detached ADU (800-1,200 sq ft): $230,000-$310,000
- Prefab or modular unit, set and finished: $185,000-$280,000
Chapter 7A compliance adds roughly 8% to 14% over a non-WUI build, and that is baked into every number above. What cannot be priced from a desk is what sits under the ground. We carry a written utility repair allowance in every Paradise contract, sized to the parcel’s history and the results of our pre-dig scan. If we hit a sheared septic lateral or an abandoned gas stub, you see a written price and a photo before we touch it. Call (971) 497-2402 and we’ll produce a written quote specific to your site.
We Also Serve Cities Near Paradise
Our crews serve the surrounding foothill and valley communities, including Chico, Yuba City, Lincoln, and Rocklin. The Chapter 7A standard we build to in Paradise also governs parts of these markets, but Paradise remains the only place in the country where nearly every ADU sits on a fire-cleared lot next to a post-2019 primary home. That specific condition shapes how we price, permit, and excavate here.
Serving Paradise, CA - Our Local Coverage Area
We’re based in the Paradise 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 - New Detached ADU in Paradise
Yes, every detached ADU in Paradise needs ember-resistant vents rated to California Chapter 7A standards, and the requirement applies to the ADU as rigorously as it applies to any primary dwelling. The vents must be listed assemblies with 1/16″ mesh screening at every eave, soffit, and gable opening. This is not a discretionary upgrade; the Paradise building department enforces it at plan review and final inspection. Call (971) 497-2402 to have us spec the correct vent assemblies before you buy materials.
Yes, and you should. The Town of Paradise’s rebuilding department allows ADU permit applications to be submitted concurrently with the primary dwelling reconstruction package, which saves months of separate plan review and prevents the town from re-inspecting work that was already approved under the primary rebuild. We bundle the ADU drawings into the same permit set as your primary home, so the review happens once. Call (971) 497-2402 if you’ve already filed the primary rebuild and want to know whether adding the ADU now is still possible.
Three things tend to slow a Paradise ADU build: buried remnants of pre-fire utility lines, undocumented backfill that settles or contains debris, and slope drainage patterns that changed when the original vegetation burned. On a cleared lot off Clark Road, we opened the trench for an ADU’s utility connection and found the original septic lateral sheared and never properly capped. We documented it, priced the same-week repair, and got written approval from the owners before proceeding. Hidden site issues are not a reason to pad a quote; they are a reason to carry a written allowance and scan before you dig.
Fire-resistant siding is required on every new detached ADU in Paradise. There is no grandfathering for new construction, and the Chapter 7A standard applies to the lowest six feet of exterior wall exposure and the entire roof assembly. James Hardie fiber cement products meet the ignition-resistant requirement and come in profiles that do not look utilitarian, but the code requirement is non-negotiable. We price the compliant cladding in the original written quote so no one gets a surprise at the permit counter.
We write every upgrade into the contract as a priced allowance before work begins, then document what is found with photos, price the repair or upgrade in writing, and obtain your written approval before we touch it. The cost does not move without your signature. Builders who skip this step are the ones who hit homeowners with five-figure change orders mid-trench. For a free second opinion on any written estimate you already hold, call (971) 497-2402.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Paradise since 2015.