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5 Questions to Ask Your City Before You Spend a Dollar
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The hardest version of this story is the buyer who already bought the home. They paid the deposit, they picked the finishes, they took a Friday off work to drive to the planning desk for what they thought was a routine permit conversation, and they came home to learn that the dwelling they ordered is not legal to place on the parcel they own. The deposit becomes a hard lesson and the home becomes someone else's problem.
Almost all of these stories share a structural cause. The buyer talked to the builder before they talked to the city. The builder said the home was code-compliant. The buyer assumed code-compliant meant permittable on their lot. Those are not the same thing. Code compliance is about how the home is built. Permittability is about whether your city allows that kind of home on your specific parcel under your specific zoning classification.
There are five questions you can ask at the municipal planning desk — in person, in one visit, in under an hour — that will tell you whether your project is real or whether it's a deposit waiting to be lost. Take this list with you. Get the answers in writing if you can, or in an email follow-up if you can't.
Question 1: What Is the Zoning Classification of My Parcel and What Dwelling Types Are Permitted By-Right vs. Requiring a Variance?
Every parcel in every incorporated municipality has a zoning designation. R-1 typically means single-family residential, low density. R-2 usually adds two-family or duplex use. R-3 often allows multi-family. Agricultural zones (often A-1 or AG) allow residential use plus farming. Each of these has a specific list of dwelling types that are permitted by right — meaning you can build them with a standard building permit, no special approval — and dwelling types that require a conditional use permit, variance, or zoning amendment before they can be considered.
A manufactured home is often permitted by right in an agricultural zone, conditionally permitted in some R-1 zones, and prohibited in others. A modular home built to state modular code is treated as a site-built home in most jurisdictions and is permitted wherever site-built homes are permitted. A container home conversion sits in an undefined gray area in most zoning codes and very commonly requires a variance.
What to ask, literally: Can I see the zoning map and confirm the classification on parcel ID [your parcel number]? What dwelling types are permitted by right in this zone? Which require a variance or conditional use permit?
If the answer is manufactured housing requires a variance, ask how often those are granted, how long the process takes (usually 60–180 days), and what the success rate is. If the answer is we don't permit that dwelling type in this zone, the project is over before it starts.
Question 2: What Is the Minimum Dwelling Square Footage for Permanent Residence on This Parcel?
Many municipalities set a minimum square footage for a structure to qualify as a permanent dwelling. Common thresholds are 600 sq ft, 800 sq ft, or 1,000 sq ft. The minimum is often tied to the zoning classification and sometimes overlaid by a separate "minimum house size" ordinance the city passed in the 1970s to discourage smaller homes and never updated.
This is the question that ends most tiny house projects. If the minimum is 800 sq ft and your home is 320 sq ft, the home is not permittable as a permanent residence regardless of how it's built. You may still be able to place it as an accessory dwelling unit (see Question 3), but it cannot be your primary residence on its own parcel.
A handful of cities have explicitly eliminated minimum square footage requirements as part of housing affordability reform. Most have not.
What to ask, literally: What is the minimum habitable square footage for a permanent dwelling on this parcel? Is that minimum in the zoning code, the building code, or a separate ordinance? Are there any pending amendments?
Question 3: What Are the ADU Regulations, Setbacks, and Utility Hookup Requirements?
An Accessory Dwelling Unit (ADU) is a secondary, smaller dwelling on the same parcel as a primary home. California, Oregon, Washington, and a growing number of other states have passed legislation requiring all municipalities to permit ADUs by right under specific standards. Many other municipalities permit ADUs but with restrictive rules — owner-occupancy of the primary residence, no separate utility meters, size caps tied to a percentage of the primary home's footprint.
Setbacks are the minimum distance the structure must sit from property lines. A typical R-1 setback is 25 feet from the front, 5–10 feet from the sides, and 15–25 feet from the rear. ADUs sometimes get reduced setbacks to encourage backyard placement. If your lot is narrow, the setback math may make the ADU footprint smaller than the home you wanted to put on it.
Utility hookup requirements are where most ADU budgets die. Some cities require a separate sewer lateral to the main, separate water meter, separate electrical service, even when the ADU shares a wall with the primary home. Each of those adds $5,000–$15,000 to the project.
What to ask, literally: On this parcel, can I place an ADU by right or does it require approval? What are the front, side, and rear setbacks for an ADU? What's the maximum size? Does it require separate utility meters or can it share with the primary residence? What's the approval timeline?
Question 4: Is HUD-Code Manufactured Housing Permitted, or Is State Modular Required?
This is the question that determines what kind of home you can actually buy. HUD-code manufactured housing is built to the federal HUD code, identifiable by the metal HUD certification label on the exterior. State modular housing is built to the state's building code, identifiable by the state insignia inside the home.
In some jurisdictions — particularly within incorporated city limits in higher-cost markets — only state modular is permitted in residential zones. HUD-code manufactured is restricted to mobile home parks, agricultural zones, or specific overlay districts. This is the rule that surprises buyers who assumed manufactured housing was universally legal.
The distinction matters because state modular homes generally cost 20–60% more than comparable HUD-code manufactured homes. If your budget assumed manufactured and your jurisdiction requires modular, the project economics change.
What to ask, literally: On this parcel, is HUD-code manufactured housing a permitted dwelling type? Is state modular housing a permitted dwelling type? Are there any aesthetic or design standards — pitched roof, exterior cladding, foundation type — that homes must meet beyond code?
Some jurisdictions also have what are called "anti-discrimination" overlays, where the city is prohibited from treating a manufactured home differently from a site-built home as long as it meets certain design standards. Knowing whether your jurisdiction has one of these is useful.
Question 5: What Permits and Inspections Will Be Required, and What's the Rough Timeline?
Get the full permit list in writing. A typical permit package for a manufactured or modular installation includes: building permit, electrical permit, plumbing permit, mechanical (HVAC) permit, foundation permit, set permit, septic permit (if applicable), well permit (if applicable), driveway permit, and certificate of occupancy. Each has a fee, a plan review process, and one or more inspections.
Inspections typically happen at foundation pre-pour, foundation post-pour, set, rough electrical, rough plumbing, rough mechanical, insulation, drywall, final electrical, final plumbing, final mechanical, and final building. Each inspection requires the work to be ready and an inspector to be available. Inspector availability is often the rate-limiting step on the project.
The timeline question matters because it sets your expectation for how long the project will take. A typical permit-to-occupancy timeline in a functional jurisdiction is 90–180 days for a manufactured home and 120–240 days for modular. In slower jurisdictions, double those numbers.
What to ask, literally: What's the full permit list for placing a [manufactured/modular] home on this parcel? What are the inspection points? What's the typical timeline from permit application to certificate of occupancy? Are there impact fees, and how much?
Impact fees are the line item that closes more deals than buyers expect. A growing city may charge $10,000–$25,000 in impact fees for a new residential dwelling — water, sewer, schools, parks, transportation. These are not negotiable and they are payable at permit, not at occupancy.
Reading the Zoning Map
A zoning map is a color-coded overlay on a parcel map. Each zone has a designation (R-1, R-2, A-1, C-1) and a color. Your parcel will show one designation. The cities you can verify this for online include most US municipalities — search [city name] zoning map and you'll find an interactive viewer.
Pay attention to overlays. A parcel can be zoned R-1 with a historic district overlay, a floodplain overlay, an airport noise overlay, or a hillside overlay. Each overlay adds rules on top of the base zoning. A property in a floodplain has different foundation requirements. A property in a historic district has aesthetic review requirements. A property under an airport approach has noise insulation requirements.
Setback diagrams in the zoning code show the buildable envelope on your lot — the area inside the setbacks where structures can go. Calculate this before you decide what home fits.
ADU ordinance amendments are usually posted on the city planning department's website under recent amendments or pending ordinances. If your city is in the middle of an ADU reform process, the rules may be different next month than they are today. Sometimes that's good for your project. Sometimes you should wait.
The Pattern
The buyers who get through the permitting process cleanly are the ones who went to the planning desk first, asked these five questions, and let the answers shape what home they bought. The buyers who get stuck are the ones who fell in love with a home, paid a deposit, and then asked the city for permission afterward.
It is much cheaper to learn the parcel is wrong before the deposit is wired than after.
PERCH lists builders who already know the answers to these questions for the states and zones their homes are designed for, and we maintain state-by-state guides on what's typically permitted where. If you'd like a builder whose homes are designed to clear common permitting hurdles in your jurisdiction, join the PERCH waitlist.
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