A fence project that exposed the mix-up
A homeowner came to me to build a fence. He already had a survey from years back and was sure it was on file with the county. It was not. The reason is a mix-up that costs homeowners more than almost anything else.
He wanted his corners confirmed so there would be no argument with the neighbor. He had paid good money for a document years earlier, kept his copy, and reasonably assumed that a survey is a survey.
The document would not do the job he needed now. That distinction is worth understanding before you order work.
What he actually bought
From the document and the work described, he appeared to have an Improvement Location Certificate, or ILC. Under Colorado's current surveying rules, an ILC is not a land survey plat or an improvement survey plat. It does not establish property corners.
The required certification also says an ILC is not to be relied upon to establish a fence, building, or other future improvement. That is why an old ILC can be perfectly real and professionally prepared, yet still be the wrong document for placing a new fence.
The word "survey" covers several products. They answer different questions, and their filing requirements are not the same.
The three documents people confuse
Improvement Location Certificate (ILC). This is a limited product based on deed and plat information, field measurements, and visible evidence. The Board rules require it to disclose that it does not establish corners and is not a land survey plat or improvement survey plat.
Land Survey Plat (LSP). This documents a boundary survey. Colorado law specifies when a land survey plat must be deposited with the county surveyor or filed with the county clerk and recorder, including certain cases involving boundary establishment, disputed boundaries, or material disagreement with existing records. Those triggers are set out in Title 38 of the Colorado Revised Statutes.
Improvement Survey Plat (ISP). This combines boundary-survey information with the location of improvements and other details required by the client or applicable standards. The right choice depends on the decision the document must support, not simply on which product sounds most comprehensive.
What Jefferson County asks for now
For building-permit site plans in unincorporated Jefferson County, a July 7, 2026 Director's Determination explains when Planning and Zoning may accept a non-certified site plan instead of an LSP or ISP. It allows that option only in specified circumstances and lets staff require a survey when available records or a history of property conflict raise concerns.
The determination also warns that a non-certified site plan is less accurate and does not relieve an owner from meeting setbacks. In other circumstances, a survey is required. This is why two seemingly similar projects may not need the same documentation.
For fences, Jefferson County's current outside-the-home guidance says the county does not require a permit in unincorporated areas, although fences must comply with zoning and gates across access require a miscellaneous permit. The county also tells owners to review subdivision covenants. A municipality or HOA may impose different requirements.
Why the distinction matters
A document prepared for one decision should not be stretched to answer another. An ILC may have served its original transaction, but it does not become a boundary survey because a homeowner later needs to place a fence. Likewise, Jefferson County's acceptance of a non-certified site plan in a qualifying permit case does not turn that plan into a survey.
That is the trap I see: the homeowner remembers paying for "a survey," while the surveyor, permit office, and title company are talking about specific products with specific limits.
How to avoid paying for the wrong product
Before ordering, tell the surveyor what decision you need the document to support. Ask for the exact product name, what fieldwork and monuments are included, and whether the resulting record will be deposited or recorded under the circumstances described in Colorado law.
If a permit is involved, confirm the current submittal requirements with Jefferson County Planning and Zoning or the municipality governing the address. If an HOA is involved, read its covenants before choosing the survey product.
Those questions would have saved my homeowner a long search for a record that did not exist. More importantly, they would have made clear from the beginning whether the document could answer the question he actually cared about: where the fence could go.