Grantham Property Tax Quick Facts
- Location
- Grantham, New Hampshire
- Sullivan County
- Assessed By
- the Sullivan County assessor
How to Appeal Property Taxes in Grantham
Check your assessment
Enter your Grantham address for a free 60-second check. We compare your assessed value against comparable sales and neighborhood data.
Get your evidence packet
If over-assessed, pay $45 for a complete appeal packet with comparable sales, equity analysis, and pre-filled forms for Sullivan County.
File your appeal
Submit your appeal to Sullivan County. Our filing guide walks you through every step.
About the Grantham Property Market
Grantham is a city located in Sullivan County, New Hampshire. Every property inside the Grantham city limits is assessed by the Sullivan County assessor, which applies New Hampshire property tax rules uniformly across the county.
Because Grantham property values are set at the county level, the same assessment rules apply to homes throughout the city. Homeowners who believe their Grantham home is over-assessed have the right to file a appeal directly with Sullivan County.
New Hampshire allows the assessor to defend or adjust the assessed value during a appeal, so Grantham homeowners should build a strong evidence-based case before filing — which is exactly what ProtestMax generates for $45.
Grantham Property Market Context
As a city in New Hampshire, Grantham inherits the state's assessment framework — which shapes how over-valuations occur and how homeowners can fight them.
New Hampshire market character
New Hampshire has no income tax or sales tax, so property taxes fund almost everything — effective rates are among the highest in the country at around 2.0%. Towns reassess on their own schedules, and older town valuations can be wildly out of date.
How New Hampshire handles appeals
New Hampshire homeowners apply for abatement with the local selectmen or assessors, then appeal to the Board of Tax and Land Appeals or Superior Court. The state publishes equalization ratios that help identify over-assessed towns.
When to file in Grantham
Abatement applications are due by March 1 following the final tax bill. This is a strict statutory deadline.
Common Grantham Property Types
Grantham homeowners typically file protests across these property categories:
Single-family homes
The most common residential type and the dominant protest category.
Condominiums
Common in denser parts of the city and near employment centers.
Townhouses
Attached-home neighborhoods in newer subdivisions.
Small multi-family
Duplexes and 2-4 unit buildings assessed as income property.
Commercial
Retail, office, and small commercial along major corridors.
ProtestMax supports all of the above property types in Grantham. Each appealpacket is tailored to the property's classification and uses comparable sales from Grantham and surrounding Sullivan County neighborhoods.
Grantham Property Tax Appeal Questions
How do I appeal my property tax in Grantham, New Hampshire?
What is the property tax rate in Grantham?
When is the appeal deadline for Grantham property taxes?
How much can I save on property taxes in Grantham?
Can my Grantham property tax increase from filing a appeal?
Nearby Cities in Sullivan County
These New Hampshire cities share the same appeal deadline and are assessed by the Sullivan County assessor.