Certified Survey Maps
A Certified Survey Map (CSM) is how most small land divisions happen in Wisconsin. It's a recorded map, prepared by a licensed surveyor under Chapter 236 of the Wisconsin Statutes, that creates up to four lots or outlots.
In plain English: if you want to split off a lot for your kids, combine two parcels into one, or clean up a messy legal description, a CSM is usually how you do it.
Common reasons for a CSM
Splitting off a lot
Create a new buildable lot from a larger parcel.
Combining parcels
Merge two or more parcels into one.
Cleaning up descriptions
Replace a confusing metes-and-bounds description with a clear, recorded lot.
Dedicating land
Dedicate right-of-way or other land to the public.
What's included
- Boundary survey of the parcel
- Review of local land division and zoning rules
- Preparing the CSM to state and local requirements
- Submitting for municipal and county review
What you receive
- A CSM ready for approval
- Help through plan commission and board review
- The recorded CSM, once approved
Process and timeline
Feasibility check
We confirm the split meets zoning: lot size, frontage, and setbacks.
Typical: 1 week
Survey and drafting
Boundary survey and CSM preparation.
Typical: ___ weeks
Local approvals
Plan commission and governing body review. They have 90 days to act.
Typical: 1 to 3 months
Recording
Recorded with the Register of Deeds, within 12 months of the last approval.
Typical: 1 to 2 weeks
What affects the cost
- Number of lots and parcel size
- Boundary complexity and missing corners
- Municipal and county review fees
- Whether a zoning change is also needed
Typical price range
$___ to $___
Every property is different. Call us with the address and we'll give you a firm quote.
Frequently asked questions
What's the difference between a CSM and a subdivision plat?
A CSM creates up to four lots or outlots. Larger divisions generally require a subdivision plat, which has a longer review process.
Who approves a CSM?
The local plan commission and governing body, and the county where its ordinance applies. Under state law they have 90 days to act once the CSM is submitted.
How long does the whole process take?
Plan on ___ to ___ months. The survey is the quick part. Meeting schedules usually set the pace.
Can I sell the new lot right away?
Not until the CSM is approved and recorded. We'll tell you exactly when it's official.
Thinking about splitting or combining land?
Send us the address and a little about what's going on. We'll get back to you with a quote, usually within a day or two.