Plymouth Additional Dwelling Unit Contractor
Designed, permitted, and built on your Plymouth lot. Detached, attached, and garage-conversion ADUs handled by a veteran-owned General B contractor who picks up the phone after move-in day.
Additional Dwelling Units Built for Plymouth Lots
Plymouth’s housing pressure has made the Additional Dwelling Unit one of the smartest moves a homeowner can make. Whether the goal is rental income, a private space for aging parents, or a teenager’s first apartment behind the main house, an ADU adds a second residence on land you already own without the cost or wait of buying a new property in this market.
California state law (Government Code 65852.2) overrides most local restrictions that previously limited ADU construction, and the Plymouth updated its zoning code to comply. On most single-family residential lots in Plymouth, a homeowner can now build a detached ADU up to 1,200 square feet, an attached ADU up to 50% of the primary residence’s floor area, or convert an existing garage or basement into a separate dwelling unit.
ADC Construction handles every type. Adam meets you on the property, walks the lot, and tells you exactly what the Plymouth will and will not permit on your specific parcel. Setbacks, height limits, fire-separation requirements, sewer connections, and utility tap fees are all sorted before the design phase begins, so the project doesn’t stall at the permit counter.
The three most common ADU types we build in Plymouth: detached ADUs (a standalone structure in the backyard, typically 600 to 1,200 sqft, full kitchen, bathroom, and bedroom), attached ADUs (added onto the main house with a separate entrance, often built off the back or side wall), and garage-conversion ADUs (existing detached garage converted to a dwelling unit, often the lowest-cost path).
Plymouth lots vary widely in what they can accommodate. Older neighborhoods tend to have deeper lots with more rear-yard space, which favors detached ADUs with their own driveways or rear-access paths. Newer subdivisions often have shallower rear yards and tighter side setbacks, which makes an attached ADU or a garage conversion the practical answer. Lot coverage maximums, second-story height restrictions, and rear-yard privacy considerations for neighbors all factor in. Adam reviews the parcel map and your jurisdiction’s lot-coverage calculator with you during the quote so the project is sized to what your lot can actually carry.
Adam earned his General B contractor’s license after serving in the US Army, and he built ADC Construction in 2022 on one principle: treat every property like it’s your own home. That standard applies whether the ADU is a straightforward garage conversion or a custom detached unit with a covered patio and its own laundry.
Plymouth is an incorporated Amador County city on Highway 49 and the gateway to the Shenandoah Valley wine country, a small town with a historic downtown surrounded by vineyards and rolling foothill ground. That wine-country setting gives Plymouth ADUs their own character: some homeowners want a guest quarters for visitors coming through the tasting rooms, others want a rental or a place for family on a vineyard-adjacent parcel. Permits for lots inside city limits go through the City of Plymouth, while rural parcels on the edges run through Amador County, so Adam confirms which set of rules applies to your address before any design work starts. On the in-town lots, the ADU has to fit the older neighborhood character and setback pattern.
Many Plymouth properties on the outskirts run on private well and septic, so a second dwelling means a capacity review with county Environmental Health, and Adam checks the well and septic on the first visit and prices any upgrade into the quote. The surrounding foothill parcels sit in a fire hazard zone, so those ADUs are built to wildland-urban-interface standards with a Class A roof, ember-resistant vents, and cleared defensible space, and the foundation is engineered to the grade where the lot slopes. Everywhere in Plymouth, the summer heat means Title 24 energy detailing, good insulation, dual-pane glazing, and a right-sized HVAC system. Adam handles the permits, the utility or septic side, and the inspections from clearance through final occupancy.
Call (209) 200-5302 or request a free on-site quote. See finished work in our project gallery, including detached ADUs, garage conversions, and full-home remodels across the Sacramento and San Joaquin valleys. We serve Plymouth, Sacramento, Folsom, Lodi, Stockton, and 29 more cities within 30 miles of our Lodi office.
Six Reasons Plymouth Homeowners Trust Us with the ADU
Licensed & Insured
California General B license with full liability coverage. Plymouth permits pulled and inspected start to finish.
Veteran Discipline
US Army standards applied to every ADU jobsite: clean, organized, on time, on budget, no excuses.
Free Project Quote
Adam walks the Plymouth lot, assesses zoning + setbacks, and explains your options with zero pressure.
Transparent Pricing
Itemized quotes within 48 hours. Foundation, framing, utilities, finish. Every line item explained.
Design + Build
Architectural plans, structural engineering, Title 24 energy, and construction all coordinated under one contract.
Post-Project Support
We pick up the phone six months, six years later. The relationship outlasts the certificate of occupancy.
ADU Construction Across the Plymouth Region
Same craft standard on every ADU within 30 miles of Lodi.
Plymouth ADU Questions
How much does an ADU cost in Plymouth, CA?
What a Plymouth ADU costs comes down to three things: whether you are converting existing garage space or building detached from the ground up, the square footage you end up with, and how far the finishes go. A garage conversion is the cheapest path because the slab, walls, and roof already exist. A mid-size detached unit adds a foundation, framing, and a full utility run. A full-size detached build with a covered patio, its own laundry, and upgraded finishes sits at the top end. Around Plymouth the parcel drives the rest, since grading, utility trenching distance, and whether the water and waste systems can carry a second dwelling all change the scope. Adam walks the property first, then ADC provides an itemized quote within 48 hours of that visit so you know exactly what your Plymouth lot will need before anyone signs anything.
Do you handle the Plymouth ADU permits?
Yes. We pull every permit required by the local Planning Department and Building Division: zoning clearance, building permit, plumbing, electrical, mechanical, and any encroachment permits for sewer or utility taps, and coordinate inspections through final certificate of occupancy. Permit fees are line-itemed in your quote.
What’s the maximum size ADU allowed on my Plymouth lot?
State law allows up to 1,200 square feet for a detached ADU on most Plymouth single-family lots regardless of local zoning. Attached ADUs are limited to 50% of the primary residence’s floor area, capped at 1,200 sqft. Adam will measure your specific lot and confirm what’s allowed during the on-site quote visit.
How long does an Plymouth ADU build take from design to move-in?
Plan on 8-12 weeks for permits, plans, and engineering before the first shovel hits dirt, then 4-8 months of construction depending on type. A garage conversion is the fastest path (3-5 months building). A custom detached ADU is the longest (6-8 months building). We provide a realistic schedule with your quote and hold to it.
Can I rent out my Plymouth ADU?
Yes. California law requires Plymouth to allow long-term rentals of ADUs on single-family lots. Short-term rentals (Airbnb, VRBO under 30 days) are restricted under local ordinance. Confirm current rules with the Planning Department before counting on STR income. Long-term tenant rental is the standard income path most of our Plymouth ADU clients pursue.
Does Plymouth permit through the city or Amador County?
It depends on where your lot is. Plymouth is incorporated, so parcels inside city limits go through the City of Plymouth for the building permit and planning clearance, while rural parcels on the edges of town run through Amador County. The two follow different rules, especially on setbacks, utilities, and fire requirements. Adam confirms which applies to your exact address on the walkthrough and handles the right submittals, so the project does not stall because it went to the wrong counter.
Can I build a guest ADU on my Plymouth wine-country parcel?
Yes, and it is a common ask out here near the Shenandoah Valley. A detached ADU makes a comfortable guest quarters for visitors, family, or seasonal use on a vineyard-adjacent lot, and there is often good room to site it well on the larger foothill parcels. Adam confirms the zoning first, checks the well and septic if the lot is rural, engineers the foundation to any slope, and builds it to the fire and energy standards that apply. The result is a well-built guest unit that fits the wine-country setting.
Plymouth ADU Built to Last. Answered After Move-In.
Ready to start your Plymouth ADU project? Call Adam directly or request a free on-site quote. We walk the lot, talk through your options, and quote it transparently.