Research by DoINeedAPermit Research Team · Updated May 2026
The Short Answer
Yes, every ADU in Cypress requires a building permit. California state law (Government Code 65852.2 and later amendments) mandates local approval of ADUs regardless of zoning, and Cypress enforces this with a streamlined 60-day review timeline under AB 671.
Cypress falls under Orange County jurisdiction and has adopted state ADU law requirements, meaning the city cannot use zoning restrictions to deny a compliant ADU on single-family residential property. This is a critical difference from many other California cities: Cypress's local ordinance explicitly references the state's ministerial approval process, which caps review time at 60 days and eliminates discretionary denials for ADUs that meet objective standards (owner occupancy, unit size, setbacks, parking). Unlike neighboring cities such as Garden Grove or Anaheim, which have negotiated local parking or owner-occupancy add-ons, Cypress has aligned closely with state defaults, meaning your approval pathway is more predictable. The city uses an online permit portal (via the OC Planning & Building system); you file plans electronically, and plan review happens in sequence, not batch. Cypress does require separate utility sub-metering or dedicated connections for detached ADUs — a point many applicants miss — and the city enforces this during rough framing and mechanical inspections.

What happens if you skip the permit (and you needed one)

Cypress ADU permits — the key details

California Government Code 65852.2, as amended by AB 68 (2021) and AB 881 (2021), mandates that Cypress approve ADUs on single-family lots without discretionary denials if the unit meets objective standards: lot size (generally 1,200+ sq ft for detached; no limit for garage conversion or junior ADU), owner occupancy of primary or ADU (waived for junior ADUs and units in areas of high segregation), unit size (800–1,200 sq ft for detached; 750 sq ft for junior ADU), setbacks (typically 5–20 feet from property line depending on unit type), and off-street parking (1 space for ADU if on-street parking available, or 0 spaces in transit-rich areas). Cypress's local ADU ordinance cross-references these state requirements rather than adding local layers, which accelerates review. The city applies a 60-day shot clock from application completeness (per AB 671); if the city doesn't issue a decision within 60 days with reasonable comments, your permit is deemed approved. This is not a 'nicety'—it's enforceable law. Many applicants don't know this clock exists, so they passively accept delay; you can invoke it in writing on day 55 if needed.

Detached ADUs on corner or flag lots in Cypress face tighter scrutiny on setbacks and lot-line visibility; the city requires a surveyor's certification of distance from building corners to property lines, particularly in flood-prone areas near the Los Cerritos Wetlands or historic subsidence zones in central Cypress where clay soils create foundation risk. Cypress sits on a mix of Los Cerritos clay (expansive, 12–18 inch frost depth equivalent in bearing-capacity terms) and younger Holocene bay deposits; detached ADU foundations must account for differential settlement and poor drainage. The city requires a Phase I environmental review if the lot is within a mile of any former petroleum or agricultural site—common in Cypress's industrial-transition neighborhoods—and this can add 4–6 weeks to plan review if contamination screening triggers Phase II soil testing. Garage conversions and above-garage units avoid this because they don't require new foundations, which is why they're faster-track in Cypress.

Parking is a pressure point in Cypress ADU approvals. State law requires 1 off-street space per ADU unless on-street parking is available (per TRA criteria) or the unit is junior ADU or in a high-opportunity area. Cypress interprets 'on-street parking available' conservatively: if your street has zero posted 'no parking' zones and average occupancy is below 80%, the city will often waive the 1-space requirement. But if your lot is small and driveway space is tight, the city's parking coordinator will flag it, and you'll need a parking study or a neighborhood survey proving availability. Don't assume it's waived; request a parking exemption letter early in pre-application, and Cypress planning staff (via email) will give you a yes/no in writing. Separate utility connections or sub-metering is mandatory for detached ADUs. Cypress requires a separate gas meter, water meter, and electrical panel or sub-panel feeding the ADU. If you propose a shared water or electrical service with a sub-meter, the city's mechanical plan reviewer will accept it, but the sub-meter must be accessible to the tenant and utility companies (not locked in a garage or basement), and the electrical sub-panel must comply with NEC 705 (interconnected power sources). Junior ADUs (interior additions within the primary home) can share utilities but must have a separate, lockable electrical breaker and clearly labeled water/gas isolation valves.

Owner-occupancy rules are where state law and Cypress align tightly—and where you save money. California law now allows ADUs without owner occupancy in some cases (junior ADUs, units in high-segregation areas, and—as of AB 881—units in cities that have not affirmatively waived owner occupancy). Cypress has NOT waived owner occupancy in its ordinance, meaning state default applies: owner must occupy either the primary dwelling or the ADU. However, junior ADU and garage-conversion units are exempt from owner occupancy (a major loophole if you're renting to a family member). Many Cypress applicants miss this; they over-design a detached unit when a garage conversion would have zero owner-occupancy requirement and cost $60,000–$100,000 less. If owner occupancy is a blocker, reframe the project as a junior ADU (interior, shared kitchen or bathroom), which is deed-restricted to a single household but has no occupancy rule.

Cypress plan review happens in two gates: administrative completeness (7–10 days, city checks that all forms and plans are present) and substantive review (50–60 days, departments comment on code compliance). You must respond to comments within 20 days or risk application lapse. Typical comments from Cypress: setback calculations need field survey, electrical sub-panel placement needs NEC compliance letter, drainage plan is missing for lots near wetland buffers, or parking exemption letter is needed. On day 55, if review is incomplete, you can invoke the 60-day clock in writing. Once approved, you'll get a 'Notice of Approved Plans'—not a permit yet. You then book inspections (foundation/framing, rough mechanical, insulation, drywall, final) via the OC permit portal, and the Cypress Building Official's office schedules them. Expect 2–3 weeks for all inspections; final approval triggers a Certificate of Occupancy, which the city mails in 1–2 weeks.

Three Cypress accessory dwelling unit (adu) scenarios

Scenario A
Detached 800 sq ft ADU, 0.3-acre single-family lot, rear yard, owner-occupied secondary unit, Maple Avenue (transitional neighborhood, no on-street parking restrictions)
You own a 0.3-acre lot (roughly 13,000 sq ft) in central Cypress zoned R1-7,500 (single-family, 7,500 sq ft minimum lot size). You want to build a detached 800 sq ft, one-bedroom ADU in the rear yard, owner-occupying the new unit while renting the primary house. Cypress will approve this under CA Government Code 65852.2 because the lot exceeds the 1,200 sq ft minimum (state guidance allows smaller lots in some contexts, but Cypress is conservative and 13,000 sq ft is well above). Key approval requirements: (1) Setbacks: rear setback is typically 20 feet from rear property line (IRC R305.1 + Cypress local amendment), side setback 5 feet from side property line (junior structure rule); a surveyor's deed and ALTA survey cost $800–$1,200 and are required by day 20 of review. (2) Owner occupancy: owner in ADU satisfies state requirement. (3) Parking: one off-street space required; your lot has driveway width for one additional space (18 feet minimum), so this is met. (4) Utilities: separate water, gas, and electrical meters, sub-meter in an accessible breaker box outside the unit (not in garage). (5) Drainage: clay soil means storm runoff must be addressed; add a rain garden or dry well (cost ~$3,000–$5,000) if lot slopes toward neighbor or wetland buffer; Cypress will require a grading plan if slope exceeds 5%. Permits required: Building (ADU), Electrical (sub-panel), Plumbing (new meter, drain to city system or septic if applicable). Plan review timeline: 60 days, one round of comments (setback survey, drainage detail, electrical sub-meter accessibility). Inspections: foundation, framing, rough trades, insulation, drywall, final. No environmental screening needed if lot is >0.5 miles from former gas station or agricultural use (check the Phase I map on Cypress Planning website). Estimated cost: permit fees $2,500–$3,500 (based on $250,000 construction valuation, roughly 1%–1.4% of valuation in Orange County), environmental screening $0 (waived if far from industrial sites), survey $800–$1,200, drainage/rain garden $3,000–$5,000, plan preparation $2,000–$3,000, separate utility connections/meter $4,000–$6,000 (contractor labor + utility company fees). Total hard and soft costs: $13,000–$20,000 before construction labor and materials. Timeline: 10 weeks (2 weeks admin completeness, 6 weeks plan review + 1 round comments, 2 weeks response + re-review, 1 week permit issuance, 3–4 weeks inspections).
Permit required | Separate utilities mandatory | Survey required ($800–$1,200) | Drainage/rain garden if clay soil ($3,000–$5,000) | Permit fees $2,500–$3,500 | Owner-occupancy requirement satisfied | Total soft costs $10,000–$15,000
Scenario B
Garage conversion to 600 sq ft junior ADU, internal shared kitchen, two-story single-family home, Katella Avenue (older neighborhood, potential Phase I contamination screen), owner as primary occupant
Your home is a 1960s two-story on a 0.28-acre lot in southwest Cypress, 3 blocks from a former agricultural packing shed (now demolished, 1970s). You want to convert an attached two-car garage (576 sq ft) into a junior ADU with a bedroom and full bath, sharing the primary home's kitchen (the junior ADU kitchen must be removed or eliminated per AB 68 definition). Your adult son will occupy it; you own the primary home. Junior ADU rules in Cypress: (1) No owner-occupancy requirement (state law exempts junior ADU). (2) Unit must be interior to the primary dwelling (attached, not detached); garage counts. (3) Shared kitchen is allowed (in fact, required for 'junior' designation; if you add a separate kitchen, it becomes a full ADU and triggers owner-occupancy and higher parking requirements). (4) Maximum 500 sq ft (state law limit under AB 68); your 576 sq ft garage will need 76 sq ft removed or you reframe as a full ADU (which adds owner-occupancy requirement, defeating the purpose). Solution: convert 500 sq ft only; the remaining 76 sq ft becomes storage or is walled off as a separate space. (5) Parking: junior ADU has zero parking requirement (state law, Cypress complies). (6) Setbacks: not applicable (interior unit). (7) Phase I environmental screening: lot is 0.25 miles from historical packing shed; Cypress Phase I guidance triggers a Phase I ESA ($1,500–$2,500) even though contamination risk is low. The city's Environmental Coordinator will either waive Phase I with a letter or request Phase II soil testing ($3,000–$6,000) if Phase I shows elevated risk; assume Phase I only, no Phase II needed. (8) Utilities: junior ADU can share primary home's water, gas, and electric (no separate meters required). However, Cypress requires separate breaker panel or clearly labeled breaker isolation for the ADU circuit to comply with NEC 705. Cost: ~$600 for a sub-panel or breaker relocation. (9) Egress: junior ADU bedroom must have emergency egress per IRC R310; garage conversion typically requires a new egress window or an interior door to the primary home with a backup window; this costs $2,000–$4,000 depending on wall location. Permits required: Building (ADU/garage conversion), Electrical (sub-panel or breaker re-label), Plumbing (if adding new fixtures in the shared kitchen area; if none, plumbing permit not needed). Plan review: simplified for junior ADU; Cypress has a 45-day timeline for junior ADU applications (faster than full ADU). Comments typically address egress window detail, electrical isolation, and Phase I clearance. Inspections: framing (egress window opening), electrical (sub-panel), final. No foundation inspection needed (existing slab). Estimated cost: permit fees $1,200–$1,800 (junior ADU is ~60% of full ADU fee), Phase I ESA $1,500–$2,500, plan prep $1,500–$2,000, egress window + rough framing $2,000–$4,000, electrical sub-panel $600–$1,200. Total soft costs: $7,000–$12,000. Timeline: 8 weeks (1 week admin completeness, 4–5 weeks plan review, Phase I concurrent with review, 1 week permit issuance, 2 weeks inspections).
Permit required (junior ADU) | No owner-occupancy requirement | No separate utilities required | Phase I ESA possible ($1,500–$2,500) | Egress window required ($2,000–$4,000) | Permit fees $1,200–$1,800 | Zero parking requirement | Total soft costs $7,000–$12,000
Scenario C
Above-garage detached ADU (1,000 sq ft, two-bedroom), second story above existing two-car garage, corner lot, Fairfield Avenue (high-opportunity area per CA segregation index), non-owner-occupied (rented to unrelated tenant)
Your corner lot in Cypress is zoned R1-7,500 and has an existing 576 sq ft detached two-car garage (20 feet from side setback, 15 feet from rear). You want to build a second story above the garage (1,000 sq ft, two-bedroom, one-bath ADU), renting it to an unrelated tenant. This is an above-garage ADU, which is a specific state-law category. Cypress rules for above-garage ADU: (1) Owner-occupancy requirement is typically waived for above-garage units per AB 881 provisions (check Cypress's specific language; most California cities have done this, but Cypress's ordinance needs a staff email confirming). Assume waiver is available; if Cypress doesn't waive it, you'd need owner occupancy of the primary house or ADU, and renting to a tenant would fail. (2) Unit size up to 800 sq ft for detached (state law); your 1,000 sq ft exceeds the cap unless Cypress has a local amendment. State law allows up to 1,000 sq ft in certain high-opportunity areas (high segregation index tracts per AB 881). Fairfield Avenue in central Cypress is likely in a high-opportunity area; ask Cypress Planning staff to confirm tract number via the AFFH mapping tool. If yes, 1,000 sq ft is approved. If no, reduce to 800 sq ft. (3) Parking: one off-street space required. Your corner lot has street frontage on two sides; Cypress Planning will likely grant a parking exemption based on on-street availability unless the intersection has 'no parking' signs. Request exemption in pre-application. (4) Setbacks: side setback 5 feet (corner lot), rear setback 20 feet; your existing garage is already 20 feet from rear and 15 feet from side, so the second story sits within existing setbacks—approved. (5) Foundation: second-story above existing slab requires new pylons, posts, or grade beams to support additional weight. Clay soil bearing capacity is ~2,000 psf (typical for Los Cerritos clay); two-story wood-frame ADU (live + dead load ~80 psf) requires posts spaced ~12 feet on center, set 18–24 inches into soil (frost depth not critical in coastal Cypress, but post embedment must meet IRC R403.1.6 for lateral bracing). Geotechnical report ($2,500–$4,000) recommended if garage slab is >20 years old or shows cracking. (6) Utilities: separate water, gas, electrical meters required; plumbing tie-in to municipal lateral; electrical sub-panel per NEC 705. (7) Environmental screening: corner lot, central Cypress; if within 0.25 miles of former industrial use, Phase I ESA triggered ($1,500–$2,500). Permits required: Building (ADU/addition), Structural (if geotechnical report recommended), Electrical, Plumbing, Mechanical (if separate HVAC). Plan review: 60 days, likely two rounds of comments (high-opportunity area confirmation, parking exemption letter, geotechnical report if required, structural calcs for floor loading, electrical sub-panel placement). Inspections: foundation/posts (before deck pour), framing, rough trades, insulation, drywall, final. Estimated cost: permit fees $3,000–$4,500 (1,000 sq ft valuation ~$300,000, 1%–1.5% fee), geotechnical report $2,500–$4,000, survey (confirm setbacks) $600–$1,200, Phase I ESA if required $1,500–$2,500, plan prep $2,500–$3,500, structural calcs $1,500–$2,500, separate utility connections $4,000–$6,000. Total soft costs: $16,000–$25,000. Timeline: 12 weeks (2 weeks admin completeness, 7 weeks plan review + 1–2 rounds comments, 1 week permit issuance, 3–4 weeks inspections, plus 1–2 weeks for geotechnical report if required). This scenario is slower than Scenario A due to structural review and possible environmental screening.
Permit required (above-garage ADU) | Owner-occupancy likely waived (confirm with Planning) | Separate utilities mandatory | Geotechnical report likely ($2,500–$4,000) | Parking exemption possible if on-street available | Permit fees $3,000–$4,500 | Phase I ESA possible ($1,500–$2,500) | Total soft costs $16,000–$25,000

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The 60-day shot clock: How to enforce it and why Cypress applicants miss it

California AB 671 (2020) imposes a mandatory 60-calendar-day review period for ADU applications from the date the city deems the application complete. The clock starts when Cypress Planning issues an 'Application Complete' letter, not when you submit. Many Cypress applicants don't know this clock exists, so they passively accept delays and assume the city is 'thinking' about it. In reality, Cypress staff are often juggling multiple ADUs (the city has seen a surge since 2020), and some applications drift into month 3 without formal comments. To enforce the clock, on day 55, send a written email to Cypress Building Department and Planning Division citing Government Code 65852.2(e)(5): 'My ADU application [number] was deemed complete on [date]. Sixty days have elapsed without issuance of a decision or reasonable comments. Pursuant to AB 671, if I do not receive substantive review comments by [day 60 date], I am entitled to deemed approval.' This is not a threat; it's statement of law. Cypress will either issue comments by day 60 or face legal exposure. In practice, staff will scramble to send comments by day 60 (or close to it) once they see this email. Keep a log of all communications, application dates, and comment dates; if Cypress misses the deadline and doesn't issue comments, your approval is final and binding—you can pull the permit regardless. This has happened in Orange County (neighboring Santa Ana, Irvine) and the city has had to issue permits after the fact. Use the shot clock strategically, but professionally: don't cite it angrily, cite it matter-of-factly with date reference.

Cypress Phase I environmental screening: Which lots trigger it and how to avoid it

Cypress's Environmental Coordinator uses a Phase I ESA (Environmental Site Assessment) screening for ADUs on any lot within 0.25 miles of a historical industrial, petroleum, dry-cleaning, agricultural, or landfill site. The city maintains a database on the Planning website; you can search your address and see if it's flagged. Central and southwest Cypress (ZIP 90630, near the industrial corridor along Valley View Boulevard and along the Los Cerritos Wetlands buffer) are Phase I hot zones; north and east Cypress (ZIP 90745, residential areas near the Cypress High School district) are lower risk. Phase I ESA costs $1,500–$2,500 and takes 2–3 weeks; the consultant pulls historical USGS maps, EPA records, and aerial photos to assess contamination risk. If Phase I is clean (no evidence of past use), Cypress will issue a 'Phase I Clearance' letter and you proceed with plan review. If Phase I shows 'recognized environmental conditions' (REC, e.g., historical dry-cleaning or gas station), the city may request Phase II soil testing ($3,000–$6,000) or a Remedial Action Plan ($5,000–$15,000+). To avoid Phase I altogether, check the city's mapping tool before you buy or propose the ADU; if your lot is >0.3 miles from any flagged site, Phase I is usually waived (Cypress staff give verbal waivers via email, not always in writing—get it in email). If you're within 0.25 miles and can't move the project, expect Phase I as a standard cost and timeline add. Some applicants try to hide the proximity or claim 'no knowledge,' which delays things further when the city discovers the historic record. Be upfront early: email Cypress Environmental Coordinator with your address, and ask whether Phase I ESA is required before you pay for plan prep.

City of Cypress Building Department (part of Community Development)
Cypress City Hall, 5275 Orange Avenue, Cypress, CA 90630
Phone: (714) 229-6700 (main); ask for Building Permits or ADU Coordinator | https://permit.oc.ca.gov (Orange County permitting portal, used by Cypress)
Monday–Friday, 8:00 AM – 5:00 PM (verify current hours; closed City holidays)

Common questions

Can I build an ADU without owner occupancy in Cypress?

Yes, if it's a junior ADU (interior, shared kitchen) or if Cypress has waived owner occupancy for certain unit types under AB 881. For detached or above-garage full ADUs, state law defaults to owner-occupancy requirement (you in primary or ADU). However, junior ADUs and garage conversions specifically exempt from owner occupancy. Email Cypress Planning to ask if the city has a blanket waiver for any ADU type; most Orange County cities haven't, but some have. If no waiver, renting out a full detached ADU without owner occupancy will trigger plan review denial on that point alone.

How much does a Cypress ADU permit cost?

Permit fees are roughly 1%–1.5% of construction valuation. For a $250,000 ADU project (typical for 800 sq ft detached), expect $2,500–$3,750 in permit fees alone. Add plan review (~$1,500–$2,000), plan preparation ($2,000–$3,000), survey ($800–$1,200), environmental screening if required ($1,500–$2,500), and separate utility work ($4,000–$6,000). Total soft costs: $12,000–$20,000 before construction labor. Junior ADUs cost 30–40% less in permit fees ($1,200–$1,800) because they're interior additions.

What if my lot is too small for a detached ADU?

Cypress minimum lot size for detached ADU is typically 1,200 sq ft (state guidance, though Cypress is conservative). If your lot is smaller, convert a garage or add a junior ADU instead. Garage conversions have no lot-size minimum, and junior ADUs have no setback or lot-size restrictions because they're interior. A 0.25-acre lot (~11,000 sq ft) is big enough for detached; smaller lots should pivot to garage conversion or junior ADU to avoid setback violations.

Do I need a separate water and electrical meter for my ADU?

Yes for detached ADU or above-garage unit. Cypress requires separate water, gas, and electrical meters (or sub-panels for electric) so utility companies can bill the tenant independently and you can track consumption. Junior ADUs can share utilities with the primary home, but require a sub-panel or breaker isolation per NEC code. Don't try to put a sub-meter 'behind' the primary meter on a shared line; utilities won't accept it and Cypress inspector will catch it at rough mechanical.

What is the difference between a junior ADU and a full ADU in Cypress?

Junior ADU: interior addition, shared kitchen with primary home, max 500 sq ft, no owner-occupancy requirement, no parking requirement, no setbacks, lower permit fees. Full ADU: detached, attached above-garage, or converted garage with its own kitchen, 800–1,000 sq ft, owner-occupancy required (unless waived), parking required, setback rules apply, higher permit fees. If you're renting to someone and don't want to owner-occupy, junior ADU is your path; if you need a large two-bedroom unit and can owner-occupy the primary home, full ADU works. Most Cypress applicants default to detached full ADU without realizing junior ADU exists—it's often cheaper and faster.

How long does a Cypress ADU permit take from start to Certificate of Occupancy?

Expect 8–14 weeks total. Admin completeness: 1–2 weeks. Plan review: 6–8 weeks (Cypress does two passes if comments are complex; simple ADUs go faster). Permit issuance: 3–5 days. Inspections: 2–4 weeks (foundation, framing, rough, insulation, drywall, final). If Phase I ESA is required, add 2–3 weeks. If comments require resubmittals (e.g., parking exemption letter, setback survey), add 1–2 weeks per round. Junior ADUs are 10–12 weeks (streamlined review). Don't assume 60 days is the total—that's plan review only; you need to add admin, permit issuance, and inspections on top.

Can I act as my own contractor (owner-builder) for an ADU in Cypress?

Yes, under California Business & Professions Code § 7044, you can pull permits as owner-builder if you live on the property and do the work yourself. However, Cypress requires trade licenses for electrical and plumbing work (you cannot do these yourself unless you're a licensed electrician or plumber). If you hire a general contractor and subcontractors, you don't need a contractor's license, but the subs must be licensed. Owner-builder ADUs save contractor markup (10–20% on labor) but require you to coordinate inspections and sign off on defects; plan on 20–30 hours of your time for coordination. If ADU is for rental, the city may scrutinize owner-builder status—some staff assume owner-builders are unsophisticated and inspect more carefully. Keep excellent records (photos, invoices, inspection checklists) to defend quality.

Does Cypress require sprinklers in an ADU?

Yes, if the combined square footage of the primary home + ADU exceeds 6,000 sq ft, or if the ADU is more than one story with an occupied second story. Most detached ADUs trigger sprinkler requirement (800 sq ft ADU + 2,500 sq ft primary home = 3,300 sq ft, doesn't trigger; but if primary is 5,500 sq ft + 800 sq ft ADU = 6,300 sq ft, it does). Sprinkler installation costs $3,000–$8,000 depending on lot size and water pressure. Check Cypress Fire Department guidance (they enforce sprinkler code); email them with your lot size and primary home size to confirm. If sprinklers are triggered, budget for them in your hard costs.

What if the city rejects my ADU for a reason that contradicts state law?

Contact the Cypress Planning Director in writing, cite the specific state law (e.g., Government Code 65852.2(a)(1) if the city denies based on zoning), and request a written explanation. If the city doubles down on a denial that violates state law, contact the California Department of Housing and Community Development (HCD) via their ADU complaint portal; HCD has authority to override local denials. You can also consult a land-use attorney ($3,000–$5,000 for a demand letter) to escalate. In practice, Cypress staff understand state ADU law and rarely make outright illegal denials; more common are comments about parking or setbacks that feel like delays rather than final rejections. Use the 60-day shot clock to flush out unclear intentions early.

Do I need Cypress Planning approval before I apply for a Building permit?

No, there's no separate Planning entitlement step for ADUs in Cypress (state law streamlines this). You file a Building application with all plans, and Building Department coordinates with Planning internally. Some applicants do a pre-application meeting with Planning staff (recommended, free, informal) to confirm lot size, setbacks, or owner-occupancy details before investing in plan prep. Email Cypress Planning Coordinator and request a 15-minute pre-application phone call; they'll give you a verbal green-light on basic feasibility and then you can hire your architect to prepare formal plans. This costs zero and saves rework.

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Disclaimer: This guide is based on research conducted in May 2026 using publicly available sources. Always verify current accessory dwelling unit (adu) permit requirements with the City of Cypress Building Department before starting your project.

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