What happens if you skip the permit (and you needed one)
- Stop-work order and $500–$1,500 fine; city will require removal or legalization at double the permit cost, potentially $6,000–$20,000+.
- Insurance claim denial: if the unpermitted ADU is damaged by fire or earthquake, your homeowner's policy will not cover it or the primary dwelling.
- Resale disclosure trap: when you sell, the title company will flag the unpermitted structure; buyer's lender will refuse to fund until it's permitted retroactively or removed.
- Refinance blocking: most lenders will not refinance a home with an unpermitted ADU on the property — you're locked into your current mortgage rate.
Woodland ADU permits — the key details
Woodland's Building Department must accept your ADU permit application if it meets state-mandated minimums: at least 150 square feet (junior ADU) or 800 square feet (full ADU), with a kitchen, bathroom, and legal egress. California Government Code 65852.22 (effective January 2020) requires cities to approve ADUs on single-family lots without discretionary review — meaning no conditional-use permit, no variance, no public hearing. Woodland cannot impose setback, lot-size, or parking requirements stricter than those in the California Building Standards Code (2022 edition). The city must issue a decision within 60 days of a 'complete application' (AB 671). If Woodland doesn't respond within 60 days and hasn't asked for more information, your permit is deemed approved. That shot clock is a massive advantage: you're not waiting 6–12 months like you might in a slower jurisdiction.
Detached ADUs (the most common type in Woodland's large lots) must comply with IRC R310 egress: one exterior door to grade and one operable window in each bedroom, each at least 5.7 square feet of glass and 20 inches wide/24 inches tall (or local equivalent per 2022 CBC). Foundations depend on soil type — Woodland's Central Valley clay is notoriously expansive in some neighborhoods, so a slab-on-grade or post-and-pier system must account for frost depth (not applicable at sea level, but relevant if your lot is in higher Yolo County elevations). The city's electrical and plumbing work requires a licensed contractor or owner-builder with trade permits; you cannot do electrical or plumbing yourself even if you're the owner (California B&P Code § 7044 requires a C-10 General Contractor or appropriate trade license). Water and sewer service must be verified — Woodland's utility department will not accept two separate meters on a single residential lot in most cases, so you'll need a sub-meter system and a separate water service line, or a greywater/septic system if not in the city's service area (unlikely in town, but check with Public Works).
The 60-day shot clock has a catch: the city's 'complete application' definition is the trigger. If you submit incomplete plans (missing egress details, utilities not shown, foundation type undefined), the clock pauses. Woodland will issue a 'Notice to Correct' listing the gaps; you then have 10–15 days to resubmit, and the clock restarts. Plan submissions should include a full architectural set (floor plan, elevations, sections showing egress), a site plan with setbacks and lot dimensions, utility details (water, sewer, electric connections), and a soils/geotechnical report if the lot has a history of settlement or clay soil. For a garage conversion, include structural calculations showing header sizing and existing wall capacity. For a junior ADU (an internal ADU carved from the primary house, sharing systems), include a floor plan showing the separate entrance and how kitchen facilities are isolated from the primary kitchen — this matters because a true junior ADU cannot share a kitchen with the main house (Government Code 65852.22(e)).
Woodland's fee structure for ADUs is set by resolution and typically includes a building permit base fee ($300–$500), a plan review fee (2–3% of construction valuation, or a flat $2,000–$4,000), a school impact fee, a parks fee, and sometimes a traffic-impact fee. Total fees for a 900-square-foot detached ADU budgeted at $180,000–$250,000 in construction costs run $8,000–$15,000 combined. If you're an owner-builder (which you can be, per B&P Code 7044), the permit fee may be slightly lower, but you must arrange all trade-licensed contractors for electrical, plumbing, HVAC, and gas work. Woodland offers a free 30-minute intake consultation at the Building Department counter; use it to confirm the fee estimate and clarify the city's current ADU design guidelines before you spend money on drawings.
Inspections for an ADU in Woodland follow the standard building sequence: foundation (after excavation and before concrete pour), framing (walls, roof structure), rough trades (electrical, plumbing, HVAC rough-in), insulation and drywall, final building inspection (finishes, fixtures, egress verification), and utility final (electrical, plumbing, gas sign-off by Woodland's or PG&E's licensed inspectors). For a detached unit on a clay lot, expect a geotechnical sign-off or soils engineer stamp. The city will also require a planning final — a brief review confirming the ADU meets any local design guidelines (roof pitch, siding material, setbacks). This sequence typically takes 4–8 weeks once construction begins, depending on inspector availability and the complexity of utilities. If the ADU is a garage conversion, add 1–2 weeks for structural review before you can frame over the opening.
Three Woodland accessory dwelling unit (adu) scenarios
Woodland's Central Valley clay and ADU foundations: geotechnical reality
Woodland sits in the northern Sacramento Valley, where Quaternary clay deposits and Bay Mud extend beneath much of the residential areas. This soil is prone to settlement and expansion, especially if water table fluctuates or if clay is subjected to changing moisture. A slab-on-grade ADU (the most common detached type) must be designed with this in mind. If you're placing a 900-square-foot detached ADU on a lot zoned for single-family, a soils report (also called a geotechnical investigation) is not strictly required by code unless the lot has known issues, but Woodland's Building Department will request one if they see risk factors: prior settlement, proximate wet areas, or expansive clay flags in county records. A basic soils report costs $800–$1,500 and involves boring 10–15 feet into the ground, testing clay plasticity, and recommending foundation type and depth. For most Woodland lots with typical clay, a slab-on-grade at 4 inches minimum with a 12-inch perimeter grade beam is acceptable.
Post-and-pier foundation is another option, especially if you want to elevate the ADU for ventilation or flood resilience (Woodland is not in a 100-year floodplain, but storm surge and localized drainage issues occur). Post-and-pier requires concrete pads 3 feet deep (below any frost heave, though Central Valley frost is negligible), with 6x6 posts and beam-to-post connections per IRC R403. This method is more expensive upfront ($8,000–$12,000 vs $4,000–$6,000 for a slab) but allows easier utility work underneath and is favored by builders who anticipate future modifications.
The water table in Woodland varies by neighborhood — some areas have groundwater at 6 feet, others at 12+ feet. If your lot has a high water table (check with the city's GIS or a local soils engineer), a slab will require a sub-slab depressurization system (passive or active radon mitigation), which adds $2,000–$4,000. The permitting timeline doesn't change, but the cost does. Before you buy the lot or finalize your ADU design, hire a soils engineer ($1,200–$2,000) to confirm the site is suitable — this is the single best investment to avoid permit delays and foundation failures.
The 60-day shot clock and Woodland's online permit portal: how to avoid delays
California AB 671 requires cities to issue an ADU permit decision within 60 days of a 'complete application.' Woodland's Building Department has adopted this rule. The clock starts on the day the city issues you an 'Application Complete' notice. If you submit plans and the city identifies missing information within 5 days, they issue a 'Notice to Correct' (NTC); the clock pauses, and you have 10 days to resubmit. The clock restarts on resubmission. This can happen twice; after that, the city must either approve or deny. If 60 days elapse and the city hasn't issued a notice of denial, your permit is deemed approved — a powerful protection, but you want approval, not a deemed permit (which carries ambiguity).
Woodland's permit submissions can be made online via the city's permitting portal or in person at the Building Department counter. The online portal is preferable because it timestamps your submission and creates an automatic record; in-person submissions can have date ambiguity. Before you submit, call or email the Building Department and request the current ADU pre-application checklist and design guidelines. Woodland has published an ADU design guide (check the city website); following it exactly cuts plan-review cycle time from 2–3 weeks to 10–15 days. The checklist typically requires: (1) completed permit application form, (2) plot plan with setbacks and lot dimensions, (3) architectural floor plan at 1/4-inch scale with dimensions and room labels, (4) elevations (all four sides), (5) cross-sections showing egress windows and door heights, (6) utility plan (water, sewer, electric service locations), (7) site plan showing parking (if required; ADUs are exempt), and (8) any required soils or structural reports.
Submission completeness is the make-or-break variable. If you submit incomplete plans, you lose momentum. Hire a local architect or designer familiar with Woodland's ADU rules — they typically charge $2,000–$5,000 for a full set of ADU drawings and can coordinate with the Building Department's pre-application meeting to confirm scope. This upfront expense saves 2–4 weeks of back-and-forth. Once the permit is issued, you have 180 days to start construction; if you don't pull a building permit within 180 days of the ADU permit (or if you have a separate building permit that expires), you must reapply. Plan your timeline accordingly, especially if you're waiting for financing or contractor availability.
Woodland City Hall, 300 First Street, Woodland, CA 95695
Phone: (530) 661-5600 (main) — ask for Building & Safety Division | https://www.cityofwoodland.org/permits (verify current URL with city)
Monday–Friday, 8:00 AM–5:00 PM; closed city holidays
Common questions
Do I need owner-occupancy in my ADU in Woodland?
No. California SB 9 (effective January 2021) prohibited cities from requiring owner-occupancy of either the primary home or the ADU. You can own a Woodland property, live in the primary house, and rent the ADU to tenants. If you own the ADU only and live elsewhere, that is also permitted. Woodland's Municipal Code cannot override this state law, and any local owner-occupancy rule is void.
Can I build an ADU on a lot that is already zoned for multi-family?
Yes, and it is even faster. If your Woodland lot is zoned multi-family or mixed-use, an ADU is treated as a residential use fully compatible with the zone. You do not need a conditional-use permit or any discretionary approval. The ADU must still meet the state-mandated minimums (kitchen, bathroom, separate egress) and pass building code review, but zoning is a non-issue. Plan review typically takes 10–15 days vs 15–25 days for a single-family lot.
What is the maximum size ADU I can build in Woodland?
State law caps ADUs at 850 square feet for a one-bedroom or 1,000 square feet for two or more bedrooms, unless the primary dwelling is less than 1,200 square feet (then the ADU can be up to 50% of the primary dwelling's size, or 800 sq ft, whichever is greater). Junior ADUs are capped at 500 square feet. Woodland cannot impose a stricter size limit. If you want an ADU larger than these state maximums, you need a local variance, which requires a public hearing and is discretionary — not recommended; stick to state sizes.
Do I need to park a car in the ADU lot in Woodland?
No. California Government Code 65852.22(a)(3) waives parking requirements for ADUs on single-family lots. If your lot is under 2,500 square feet and is zoned single-family residential, you cannot be required to provide a parking space for the ADU or the primary dwelling. If the lot is over 2,500 sq ft or is in a different zone, Woodland may apply its normal parking requirement (typically 1–2 spaces per dwelling unit), but this is rare for ADUs and can be appealed to the state. Verify with the Building Department before final design.
Can I build an ADU on a septic system in Woodland, or must I use city sewer?
Most of Woodland is within the city's sewer service area and must connect to the municipal system. If your lot is outside the service boundary (unincorporated Yolo County or a jurisdiction with its own sewer), you can use a septic system, but the ADU must meet all septic design standards: 1,000–2,000 square feet of leach field depending on soil type, at least 100 feet from a well, and county approval. A septic ADU is more difficult and expensive to permit than a municipal sewer ADU. Check with Yolo County Environmental Health if your lot is unincorporated; if it's in Woodland city proper, you must use city sewer.
How long does the entire ADU permitting and construction process take in Woodland?
Plan review and permit issuance: 30–50 days (within the 60-day shot clock). Construction: 8–16 weeks depending on complexity (detached new construction is slower than a garage conversion or junior ADU). Inspections and final sign-off: 3–6 weeks. Total time from application submission to a certificate of occupancy: 4–6 months if everything is smooth; 6–9 months if there are delays in resubmissions, contractor availability, or inspection scheduling.
Can I convert my rental garage apartment to an ADU in Woodland?
If you have an existing unpermitted or old-permitted garage apartment (sometimes called a 'granny flat'), you can formalize it as an ADU by pulling an ADU permit. This is called 'legalizing' a non-conforming use. You must submit a current floor plan, egress details, electrical/plumbing/mechanical documentation, and evidence of existing occupancy. The city will issue an ADU permit and conduct inspections to confirm code compliance. If the existing unit fails code (e.g., no egress window in the bedroom), you must remedy it before final approval. Legalization is often cheaper and faster than new construction because you're not doing foundation or major structural work — typically $4,000–$8,000 in permit fees and $10,000–$30,000 in upgrade costs depending on the unit's condition.
Does Woodland allow ADUs on corner lots, and are setbacks different?
Yes, ADUs are allowed on corner lots. Setbacks for a detached ADU are the same as for a primary house: typically 5 feet from the side lot line, 25 feet from the front, and 5 feet from the rear (verify exact setbacks in Woodland's current Municipal Code or ask at the pre-application meeting). A corner lot has two front setbacks (one for each street-facing side); the ADU must respect both. If your corner lot is small or oddly shaped, setback constraints may make a detached ADU infeasible — consider a garage conversion or junior ADU instead.
What happens if Woodland denies my ADU permit, and can I appeal?
Woodland cannot deny an ADU permit solely because it conflicts with zoning or local design guidelines; state law prohibits that. The city can deny an ADU only if it fails building code, poses a safety hazard, or violates a specific state-mandated constraint (e.g., water/sewer unavailable, lot too small for code-compliant egress). If denied, you have the right to appeal to the Woodland City Council (an administrative appeal, not a hearing). If the city denies based on a zoning conflict, you can file a state appeal with the California Department of Housing and Community Development (HCD) or hire an attorney to sue for violation of Government Code 65852.2. Most denials are reversed because the city cannot legally uphold a zoning-based objection. Get a clear written reason for any denial from the Building Department before you appeal.
Are there pre-approved ADU plans in California that Woodland will fast-track?
Yes. California SB 9 (amended by AB 68 in 2022) allows the state to develop and publish pre-approved ADU plans; cities must process applications using those plans within 30 days (a faster clock than 60 days). As of 2024, HCD publishes pre-approved ADU plans on its website (ca.gov/planning). If you use one of these plans and file in Woodland, you should get a 30-day turnaround. However, these plans may not match Woodland's local design guidelines (roof pitch, materials, setbacks) exactly, so confirm with the Building Department before you invest in a pre-approved plan. Using a local architect familiar with Woodland's specifics is often safer, even if the review takes 50–60 days.