A buyer called me last spring about a lot in a plat where the road was still gravel and the lot stakes had just gone in. Her question was the right one. If the street is not finished, who pays to finish it, and can that bill land on me later?
In most of southeastern Wisconsin the developer installs the public improvements and that cost is already inside the price of the lot. But there is enough variation between municipalities and between projects that you should never assume. Here is how it usually works and what to verify before you sign anything.
What infrastructure actually means in a plat
When people say a subdivision is improved, they are talking about a specific list of work. It usually includes:
- Street grading, base course, and final asphalt
- Curb and gutter where the municipality requires it
- Storm sewer, ditching, and any detention or retention basin
- Sanitary sewer mains with a lateral stubbed to each lot, or an approved alternative where public sewer is not available
- Water mains with a service stub to each lot, or individual wells
- Electric, gas, and telecom conduit, plus streetlights
- Sidewalks and street trees where the ordinance calls for them
- Erosion control and site restoration during construction
An improved lot in a listing is supposed to mean that work is done or bonded. It does not always mean the asphalt is on. Ask which of those items are finished, which are bonded, and when the final course of pavement goes down. In a plat where homes are still being built, the final asphalt often waits until most of the heavy trucks are gone, and that can be a year or more after you close.
The developer agreement decides most of this
Before a plat gets final approval, the developer signs an agreement with the city, village, or town. That document spells out what gets built, to what standard, on what schedule, and who guarantees it. It also sets the financial security, usually a letter of credit or a bond, that the municipality holds in case the developer stops before the work is finished.
That agreement is a public record. You can request a copy from the municipal clerk or the engineering department, and I do this as a matter of course when a client is looking at a lot in an active plat. It answers the question better than any sales office will.
If you read one document before buying a lot in a new plat, read the developer agreement. It tells you what is promised, who is on the hook, and what happens if the project stalls.
What usually falls to the lot buyer
Even when the developer builds the streets and the mains, a set of costs normally belongs to whoever builds the house. These are not hidden, but they surprise people who assumed the lot price covered everything:
- Connection or hookup fees for sewer and water, paid at permit time
- Impact fees, where the municipality has adopted them, for things like parks, fire, or other public facilities
- The water meter and the lateral run from the stub at the property line to the house
- The driveway and the apron where it meets the street
- Final grading, topsoil, and restoration on your lot
- Sidewalk across your frontage, in some municipalities
- Well and septic installation on unsewered land, plus the sanitary permit
Those amounts vary by municipality and they change. I do not quote them from memory and neither should anyone else. The building inspection or engineering office will give you the current fee schedule, and your builder should put the ones they are covering in writing in the contract.
Special assessments
This is what people are usually getting at when they ask who pays. A special assessment is a charge a municipality can levy against benefiting properties to pay for a public improvement. In a brand new plat the improvements are normally paid for by the developer and recovered through lot prices, so there is nothing left to assess. The risk is higher in two situations: an older parcel on a street that is due for reconstruction, and a stalled project where the municipality ends up finishing work the developer did not.
Before you buy, ask the clerk whether there are any levied, pending, or deferred special assessments against the parcel, and whether the municipality has a planned project that would touch that street. Get that answer from the municipality, not from a seller’s recollection.
Phases change the math
Later phases in a subdivision often price higher per lot than the first phase did. Part of that is simple supply, since the easiest lots tend to sell first. Part of it is that the streets and mains for the next round are being built at newer costs. If you are comparing a lot in phase one to a similar lot in phase three, you are not comparing identical products, and the infrastructure timeline for the newer phase is usually further out.
What to ask before you write the offer
- Is the plat recorded, and is this lot in a recorded phase?
- Which improvements are complete, which are bonded, and what is the schedule for final asphalt?
- May I see the developer agreement and the approved plat?
- Are there any special assessments levied, pending, or deferred on this parcel?
- What are the current connection and impact fees, and which ones is the builder covering in writing?
- Who maintains the stormwater basin, and is that an association obligation?
- Is the street public and accepted by the municipality, or still private?
That last one matters more than it sounds. Until a municipality formally accepts a street, plowing and maintenance can still sit with the developer or an association, and the handoff date is worth knowing in advance.
None of this is legal, engineering, or lending advice. I am not a municipal engineer or an attorney, and the binding answers come from the municipality, the recorded documents, and your own counsel. What I can do is get the plat and the developer agreement in front of you, make the calls to the clerk and the engineering office, and help you read what comes back. If you are looking at a lot in an active plat anywhere in southeastern Wisconsin and want to know what is actually built versus what is still a promise, call me and we will find out before you commit.
