Delaware County Property Tax Appeal — Deadline and How to File
The deadline
Filing deadline
August 1
per the Delaware County Board of Assessment Appeals' Rules and Regulations, checked 2026-09-10 — source
Who hears it, and where it goes
Your appeal is decided by the Delaware County Board of Assessment Appeals.
Where to file
Board of Assessment & AppealsGovernment Center Building
201 West Front Street
Media, PA 19063
The form: Residential Application Form.
Filed by mail or by hand delivery.
Not accepted by fax or electronically.
Every appeal needs an original signature. USPS postmarks can be delayed, so the county advises hand delivery, or asking the Post Office counter for a hand-cancelled postmark, a Certificate of Mailing, or Registered or Certified Mail.
per the Delaware County Board of Assessment's appeal instructions, checked 2026-09-10 — source
Nearby counties
- Philadelphia County — Board of Revision of Taxes
- Chester County — Chester County Board of Assessment Appeals
- Montgomery County — Montgomery County Board of Assessment Appeals
- Bucks County — Bucks County Board of Assessment Appeals
- Berks County — Berks County Board of Assessment Appeals
- Lancaster County — Lancaster County Board of Assessment Appeals
More: the county index and the Pennsylvania guide.
What your assessed value means here
Pennsylvania — assessed at a base-year value; the STEB Common Level Ratio for your county is about 54.64% of current market. Confirm the ratio on your notice (53 Pa.C.S. §8854).
Delaware County's common level ratio is drawn from the 2025 CLR (2024 sales data; effective 7/1/2026–6/30/2027) table — the same figure the app uses to compare your assessment to current market value.
Can the board raise your assessment?
Yes. The Delaware County Board of Assessment Appeals can raise your assessment on your own appeal, not only lower it. That is the risk you take by filing, and it is why the case has to be worth making before you file it.
What a board actually weighs
The Delaware County Board of Assessment Appeals decides what your property was worth on the valuation date, so recent comparable sales carry the case, not the size of the bill. The Pennsylvania guide covers the evidence.
Common questions
- When is the deadline to appeal my property assessment in Delaware County?
- The deadline is August 1 — per the Delaware County Board of Assessment Appeals' Rules and Regulations, checked 2026-09-10.
- Who decides my appeal in Delaware County?
- The Delaware County Board of Assessment Appeals.
- Where do I send my appeal in Delaware County?
- To the Board of Assessment & Appeals, Government Center Building, 201 West Front Street, Media, PA 19063 — per the Delaware County Board of Assessment's appeal instructions, checked 2026-09-10. The form is the Residential Application Form.
Sources
Property tax rules and deadlines vary by jurisdiction and can change — verify with your county before relying on this.
PROppeal is coming soon for Delaware County
When it launches, PROppeal will check your case against real, recent comparable sales and give you an honest verdict — then build the board-ready letter to file — $29.99, no percentage of your savings.
Want a heads-up when it’s live? Email [email protected].