Land records · Parcel maps · October 7, 2026
Certificate of Appropriateness: Historic Review
What a certificate of appropriateness is: historic commission approval for exterior work, additions, or demolition on a property in a historic district.
Certificate of appropriateness is an approval issued by a local historic preservation commission or staff confirming that proposed work on a property in a historic district, or on a designated landmark, meets the district’s design standards. It is typically required before a building permit can be issued for exterior alterations, additions, new construction, or demolition. The certificate, often called a COA, focuses on how changes affect historic character, such as materials, scale, and design. This page is general land-records background, not legal advice.
When a COA is needed
| Work | Typically requires review |
|---|---|
| Window or door replacement | Often |
| Siding or roofing material changes | Often |
| Additions | Yes |
| New construction | Yes |
| Demolition | Yes |
| Painting | Sometimes, depending on the district |
| Interior work | Usually not |
Requirements depend on the local ordinance. See what is a historic district.
Staff vs commission review
Many cities let staff approve minor work, such as in-kind repairs, quickly. Major work goes to the full commission at a public meeting.
The application process
- Consult guidelines and staff early.
- Submit application with photos, drawings, and material samples.
- Staff review or commission hearing.
- Decision to approve, approve with conditions, or deny.
- Building permit follows. See how to find building permits for a property.
Standards used
Commissions often rely on local design guidelines and the Secretary of the Interior’s Standards for Rehabilitation, which favor repair over replacement and compatible but distinguishable additions.
Appeals
Denials can usually be appealed to the governing body or a board, and then to court. Some ordinances offer hardship relief when compliance would cause economic hardship.
COA vs zoning approvals
A COA addresses historic design. Zoning approvals, such as a variance, address use and dimensional rules. Some projects need both. Historic districts often operate as an overlay district.
Working without a COA
Doing exterior work without a required certificate can lead to stop-work orders, fines, or orders to restore the original features. Unapproved changes may surface when selling.
Example
An owner wants to add a rear addition. The commission approves it with conditions that it be set back from the side walls, use compatible siding, and be lower than the main roof, so it does not overwhelm the historic house.
Tips
Bring photographs of existing conditions, show examples of similar approved projects, and be open to alternatives. Early consultation often avoids delays.
Records
COA decisions are public records. Buyers can request past approvals to see what work was permitted and whether conditions apply.
Timelines
Staff approvals may take days. Commission reviews depend on the meeting schedule, often monthly, so major projects should plan for one to two months, longer if revisions are requested.
Emergency repairs
Many ordinances allow emergency repairs after storms without prior approval, provided the owner notifies staff promptly.
Bottom line
A certificate of appropriateness is historic preservation approval for exterior work, additions, new construction, or demolition in a historic district. It usually comes before a building permit. Consult guidelines and staff early, and keep records of approvals. Explore zoning overlays via the Platbookmapper map.
Certificate of appropriateness FAQ
What is a certificate of appropriateness?
Historic preservation approval for exterior work.
Do I need a COA to replace windows?
Often, in local historic districts.
Who issues a COA?
A preservation commission or staff.
Can a COA be denied?
Yes, with options to revise or appeal.
Is a COA the same as a building permit?
No, it usually comes before the permit.