CA License #1119373Future Generation
Custom-designed ADU on a Folsom lot, shaped around granite ground and matched to the main house.
Folsom · Custom ADU

A Folsom ADU drawn for granite,
your house, and the family moving in.

Folsom lots come with rock, grade and HOA rules a catalog plan ignores. Our designer draws a bespoke unit around all three, then we build it through final inspection.

  • 30+ Years Experience
  • Licensed & Insured
  • 100+ 5-Star Reviews
ADU Estimator

Estimate Your ADU Project

ADU Type

Size — 400 sq ft

Estimated Cost

$134,000

Rental Income

$2,000/mo

Payback Period

6.3 yrs

Fast. Free. No obligation.

Trusted by homeowners across Sacramento & surrounding areas.

Custom ADU in Folsom — fast facts

CityFolsom
ADU typeCustom ADU
Contractor licenseCSLB #1119373
Free estimate(916) 677-9774

Last updated

Why custom in Folsom

When the lot, not the plan, calls the shots

A stock detached plan wants a flat, empty rectangle behind your house. Folsom rarely hands you that. We get the calls from lots out by the American River Canyon where the grade rolls eight feet toward the rim, and from older streets where a granite outcrop sits exactly where the catalog wants a slab. Custom answers what a pre-drawn plan can't even see. Our designer starts from your real parcel — the rock, the slope, where the view sits, City of Folsom setbacks — and shapes a unit to it. That's the divide. Stock makes your lot obey the plan; custom makes the plan obey your lot. It costs more, and on a Folsom parcel it usually earns the difference.

Custom ADU framed on a Folsom lot sited around an existing granite outcrop.
  • Drawn around granite outcrops, a canyon-rim grade, or a view you want kept
  • Designer works from your survey and soils report, not a fixed pad
  • The answer when no off-the-shelf footprint actually lands on the lot
The design phase

Design phase, site walk to permit

Custom is won in the drawings, so we put real hours there. It opens with a site walk and a measure-up — I've walked enough Folsom backyards to know a survey never tells the whole story, especially where decomposed granite hides under two inches of topsoil. Then concept sketches. You react, we revise. Most clients run two or three rounds before a floor plan feels right; a few push past five. Once the layout locks we move to construction documents: structural, Title-24, mechanical, plumbing, and the SMUD load calc. The honest part — this front end runs six to ten weeks before a single permit lands at the City of Folsom counter. Longer than any stock plan. That's the trade for a unit nobody else owns.

Custom ADU floor plan and elevations laid out during the Folsom design phase.
  • Site walk and measure-up before a single line gets drawn
  • Two to five revision rounds until the floor plan is right
  • Full construction documents drawn in-house, then filed in Folsom
Matching the main house

From Historic Folsom to Empire Ranch

A custom unit should look like it grew out of your house, not like it got parked behind it. Folsom makes that real work, because the town swings hard between eras. Down in Historic Folsom near Sutter Street you've got 1800s cottages, lap siding, deep porches — and the old-town design review will look at what you build. Up in Empire Ranch and Broadstone it's big two-story elevations, stucco, steeper pitches, tighter HOA tracts. Out in the newer Folsom Ranch area it's whatever the builder's pattern book set. We match roof pitch, pull eave depth, copy trim and source siding that reads the same from the street. Going custom is the only way the ADU ends up belonging to the property — a copied stock elevation almost never does.

Custom ADU exterior detailed to match a Folsom home's roofline and siding.
  • 1800s cottage detailing for Historic Folsom, with old-town review handled
  • Two-story stucco match for Empire Ranch and Broadstone elevations
  • Roof pitch, eave depth and trim drawn to your specific home
Multi-gen + finishes

Multi-generational layouts done right

A lot of our Folsom custom work is families solving one exact problem — aging parents who want their own front door, or an adult kid staring at local rents who isn't moving out. That reshapes the plan. We draw zero-step entries, 36-inch doorways, curbless showers with grab-bar blocking already in the walls, and a second primary suite so two generations each keep privacy. The detached state ceiling is 1,200 sq ft, and custom clients tend to push right up against it — at that size you fit two real bedrooms, a full kitchen, a proper living room. Then there's finish level. Quartz, real oak floors, a tiled shower instead of a fiberglass insert. Custom is where the premium package actually fits, designed in from day one rather than bolted on.

Aerial of a larger custom ADU near the 1,200 sq ft ceiling on a Folsom lot.
  • Zero-step entries, wider doorways, curbless showers, grab-bar blocking
  • Second primary suite so two generations share without crowding
  • Quartz, hardwood and full tile drawn in, not added on later
Build Smart. Invest Wise.

Build Your ADU.
Your Investment,
Your Future.

From design to move-in, we handle everything. Transparent pricing, on-time delivery, and uncompromising quality.

Custom Designs

Tailored to you

Built to Last

Premium materials

Fast Turnaround

On-time delivery

Full-Service

From start to finish

30+

Years of Experience

120+

ADU Projects Completed

100+

Happy Homeowners

Completed ADU built by Future Generation in Sacramento

Built for Value.
Designed for Life.

Trusted by homeowners across Sacramento & surrounding areas.

ADU Estimator

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Your Live Estimate

Detached ADU800 sq ftStandard

Estimated Construction Cost

$189,000

≈ $236/sq ft · all-in, turnkey

Est. Rental Income$2,800/mo
Annual Income$33,600/yr
Build Timeline5–7 months
Payback Period6.3 yrs

15.8% annual ROI

Based on local rents & your selections

Estimate for planning only. Final pricing depends on site conditions, lot, and city fees. Get an exact quote from our team — free.

Hi there!

I'm Tim, your ADU specialist.

I'll help you build smart and maximize your investment.

Tim, ADU specialist at Future Generation

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We design and build high-quality ADUs that increase property value and generate real income.

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Tim, ADU specialist

“Every ADU we build is designed to add long-term value and open new possibilities for your property. Let's build something great together.”

— Tim, ADU Specialist

Custom Designs

Built to fit your property & needs

Turnkey Process

We handle permits, plans & everything

Built to Last

Quality craftsmanship that stands the test

Financing Made Simple

$0 Down Options. Build Now, Pay Over Time.

You shouldn't have to drain your savings to build wealth. We partner with trusted ADU lenders to find financing that fits — many homeowners build with little to nothing out of pocket.

Home Equity (HELOC)

Tap your existing equity at competitive rates — the most popular way to fund an ADU.

Renovation Loans

Finance the build against your home's projected after-completion value.

ADU-Specific Financing

Specialized lenders who underwrite based on the rental income your ADU will produce.

Cash-Out Refinance

Roll the project into a new mortgage and keep one simple monthly payment.

Estimate Your Monthly Payment

See what financing your ADU could look like — and how rental income can help cover it.

$180,000Loan amount

Credit Score

Very good · 700–739

Estimated Monthly Payment

$1,320/mo

At 7.99% APR over 30 years (illustrative)

  • Often offset by $2,000–$3,500/mo in rental income
  • No prepayment penalties with most partners
  • Pre-qualification with no impact to your credit

Illustrative only — not a loan offer. Actual rates and terms are set by third-party lenders based on your qualifications.

Frequently asked

Questions, answered

The most common things Sacramento homeowners ask before starting an ADU project.

  • Custom is the priciest path — I won't soft-pedal it. For 2025-2026 we're seeing finished custom detached units in Folsom land roughly $398K to $590K depending on size, finish level and how rough the site is, call it $320 to $495 a square foot. Folsom skews a bit higher than Sacramento proper, partly because the lots fight back — granite excavation and an engineered foundation aren't free. A 1,150 sq ft premium unit on a rocky sloped lot can run past $540K. A stock plan on flat ground would cost less. You're paying for the design, the bespoke footprint and the finishes.
Special Offer · Get Up To$5,000 OFFYour New ADU Build!

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Save up to $5,000 on your detached, attached, or garage-conversion ADU. Permits and design included.

(916) 677-9774
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  • Local Sacramento Team
Tim, ADU specialist at Future Generation

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We treat every home like it's our own — quality work, clear communication, and happy homeowners.

PaulOwner · Future Generation
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Carrie Z
I had two bathrooms completely remodeled, two windows replaced and some siding. Everything stayed on track as planned and I absolutely love the end product. The communication was great.
Carrie Z · Google Review
9 min read1,915 words8 sections

Custom ADU design and construction in Folsom

Some Folsom backyards just won't take a stock plan — a granite shelf you can't slab over, a canyon-rim grade the catalog rectangle hates, a Historic Folsom cottage that has to be matched, or parents moving in who need a unit drawn around them. That's when you build custom. We're a Sacramento design-build crew 25 minutes west (CA license #1119373) that draws a bespoke ADU for your exact Folsom lot and builds it — design through final inspection, one team the whole way. Call (916) 677-9774.

01Section

What actually makes an ADU custom

People throw "custom" around loosely, so let me draw the line. A stock or model ADU is a plan we've already drawn and built before — pick a size, maybe swap a finish, and it drops onto a flat pad. Quickest, cheapest route, and for a clean rectangular Folsom backyard with cooperative soil it's often the right one. We're happy to build those. But it isn't custom.

Custom means the design starts at zero, on your parcel, for your situation. Our designer takes the survey, the City of Folsom setbacks, the granite, the grade, the sight line from the main house, the view you don't want to lose, and how your family plans to live — then draws a unit that didn't exist until your lot called for it. The footprint bends to the constraints. The roofline answers your house. Nobody else has this plan.