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Office of the Assessor


John S Philip, CCMA II

Assistant Assessor
Lynn Riotte

Office Hours:
NOTE: Please call to confirm hours, as they are subject to change. We periodically do field inspections outside of the office.

Monday, Tuesday, Thursday: 8:00 am – 4:00 pm
Wednesday: 8:00 am – 8:00 pm (available 8:00 am – 5:00 pm)
Friday: 8:00 am – 12:00pm

Assessment Data On-Line



THE TAXPAYER IS ALWAYS RESPONSIBLE FOR TIMELY PAYMENT ON ANY BILL BEING ADJUSTED.  If a bill is paid in full and subsequently adjusted, a request for a refund must be made in writing and can be submitted with documentation for an adjustment.
From the section below, chose a category that best describes your situation and forward the appropriate forms of proof to:
Assessment Office
Durham Town Hall
P.O. Box 428
30 Town House Road
Durham, Connecticut 06422
Please note:  Copies of the CT Department of Motor Vehicles cancellation of plate receipt may be obtained from CT Department Motor Vehicles online at:  

            If your vehicle was . . .
You must provide:
A copy of the CT Department of Motor Vehicles cancellation of plate receipt AND any one of the following:
   1. A copy of the Bill of Sale or leased vehicle return receipt with the year, make, model & Vehicle Identification Number, signed and dated.
   2. A copy of your Title showing the transfer (front / the back of title must be signed and dated);
   3. Reverse side of Registration Renewal Form – transfer of ownership form, signed and dated; or
   4. Trade-in Agreement with the year, make, model & Vehicle Identification Number, signed and dated.
   5. A letter from your insurance agent or company stating that the vehicle was sold, the date of the sale, and the year, make, model, and VIN of the vehicle.  Letters listing only the date of insurance cancellation will be rejected.

Personal Property Information and Forms 



Tax Relief Programs

Senior and/or Disabled
Totally Disabled and/or Blind Persons



2020 Updated Revaluation Listing by location  

In accordance with Connecticut General Statutes, the Town of Durham has completed its 2020 revaluation of all real property for the October 1, 2020 Grand List. This revaluation will correspond to the tax bills due in July of 2021.

The Town’s last revaluation was completed in 2015. State laws require towns to recalculate market values every five years. A revaluation determines the fair market value of every property in town and equalizes the values of all properties for the purpose of a fair distribution of the tax burden.

Additional Revaluation Information


Commercial/Industrial Owners can Expect

Income/Expense Statements from Assessor Office

The Assessor’s office is mailing income and expense statements to owners of commercial and industrial real estate in April in preparation for the 2021 Grand List revaluation. Pursuant to Connecticut General Statutes Sec. 12-63c, these forms are mailed annually by April 15th and are due back to the assessor’s office by June 1st.

The assessor will use the information received to develop valuation methodology for commercial and industrial real estate assessments in the next revaluation. The income information requested is essentially rent, although miscellaneous income, such as laundry income in an apartment complex, may also be relevant. Business income, such as sales of manufactured goods or retail income, is not requested and is generally not relevant to the valuation of the real estate.
Expense information requested includes utilities costs, insurance premiums, snow plowing, garbage collection, and legal and advertising expenses – all expenses necessary to support the rent for the real estate. Expense information requested does not include business expenses, such as retail employee salaries or inventory purchases – expenses that are not generally relevant to the valuation of the real estate.

CGS Sec.12-63c requires owners of rental real estate to submit this information or incur a 10% assessment penalty. Although owners of commercial property whose space is primarily owner-occupied may not be subject to the assessment penalty, to avoid future requests, the assessor’s office asks that such owners simply return the form with the “owner-occupied” box checked. Information received is exempt from the Freedom of Information Act and will be treated confidentially.
The assessor may grant a 30-day extension to owners who may have difficulty meeting the June 1st deadline. An extension request must be submitted in writing prior to May 1st.


Mill Rate 

Effective July 1, 2022:  34.57 for RE & PP and 32.46 for MV
Effective July 1, 2021:  35.56
Effective July 1, 2020:  35.78
Effective July 1, 2019:  35.89
Effective July 1, 2018:  36.50
Effective July 1, 2017:  37.58 for RE & PP and 32.00 For MV
                                                (reduced 11/21/2017 from 39.50)
Effective July 1, 2016:  35.31
Effective July 1, 2015:  33.74 *Revaluation Year
Effective July 1, 2014:  33.22
Effective July 1, 2013:  32.66
Effective July 1, 2012:  32.19
Effective July 1, 2011:  30.46
Effective July 1, 2010:  26.81 *Revaluation Year
Effective July 1, 2009:  26.20
Effective July 1, 2008:  26.25
Effective July 1, 2007:  26.25
Effective July 1, 2006:  26.25
Effective July 1, 2005:  38.00 *Revaluation Year


Motor Vehicle Assessments

Antique Motor Vehicle Assessments
Real and Personal Property, Supplemental Motor Vehicle Appeals Form
Motor Vehicle Appeals Form


Uniform Assessment Date

Is October 1st in Connecticut. Motor Vehicles registered on October 1st will generate a bill due July 1. Vehicles registered subsequent to October 1st. will be a supplement to the October 1st Grand List. Supplement tax bills are due January 1st.


Open Space Programs

Owners of land who wish to apply for Open Space classification for the first time may do so from September 1st through October 31st. Landowners who have previously filed are not required to reapply except where there has been a change in the classification of land or a change in ownership.