An Improvement Location Certificate or ILC is an inspection of a parcel by a licensed surveyor to determine possible encroachments or other matters that could be adverse from a land surveying standpoint. 

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ILC's are often if not always required on a closing of a property or at the completion of any construction (improvements) on a property, normally residential in nature.

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An ILC IS NOT

a. It is not a survey. 
b. It does not locate exact boundaries. 
c. It does not establish property corners. 
d. It is not to be legally relied upon for locations of property lines or future improvements.

Sometimes the ILC will reveal a possible encroachment or some other evidence of a boundary dispute. In this case, a true survey, (i.e. improvement survey plat or land survey plat) would be required to clarify or resolve any discrepancies.

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Important links

Source for current Colorado Revised Statutes for ILC's C.R.S. 38-51-108

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Checklist of what is needed

1. Show property lines with boundary dimensions and bearings.

2. Show major improvements (permanent structures) with dimensions and descriptions (e.g. House, Garage, pools etc.)

3. Plat and apparent easements shall be shown.

4. Show the posted address, if not posted so state.

5. Show the legal description.

6. Show North arrow with scale.

7. Apparent encroachments shall be noted and shown.

8. Show any found pins.