POST MILLS โ€” Firefighters responded to a third alarm structure fire on Route 113 Sunday evening.

When crews arrived at about 5:20 p.m., a barn was fully engulfed in flames and fire was spreading to an attached home and “threatening a nearby residence,” according to a news release from the Thetford Fire Department. A small brush fire had also started.

All occupants of the home at 7386 Route 113 and a dog exited safely.

Firefighters responded to a third alarm structure fire on Route 113 in Post Mills on Sunday evening.

The fire started in the barn where the homeowner had been working, according to the release. In the barn, there were “numerous fuel sources and several pieces of equipment, contributing to the fire’s rapid growth and intensity.”

The property is owned by Tyler Braley and valued at $77,110, according to property records.

Both the barn and attached house are a “total loss,” Thetford Fire Chief Chad Whitcomb said Monday. The barn was completely destroyed and crews used an excavator on the building to help extinguish the fire. The attached house is uninhabitable and will need to be torn down.

Firefighters were able to save many of the personal belongings in the residence and stop the fire from spreading to another home nearby, Whitcomb said.

Aiden Braley, of Thetford, Vt., carries his prize mounted buck away from his home on Sunday, June 21, 2026. Firefighters were able to remove a number of items from the home during a structure fire which destroyed a barn on the property. The buck weighed 160 pounds when Braley harvested it during hunting season five years ago. JENNIFER HAUCK Valley News

While he did not know how many people were in the houses when the fire started or how many live there, Whitcomb said residents are staying locally with family in the wake of the fire.

In addition to Thetford, firefighters from Bradford, Chelsea, Corinth, Hartford, Hanover, Haverhill, Lebanon, Lyme, Norwich, Orford, Piermont, Strafford, Vershire and West Fairlee responded to the scene.

Upper Valley Ambulance and Thetford Support Team also provided support while the Windsor Fire Department provided on scene medical monitoring and support for firefighters and the Wentworth, N.H., Fire Department provided coverage from Orford.

Whitcomb declined to say what caused the fire, but it has been ruled accidental.

Route 113 in Post Mills near Route 244 was closed for nearly three hours Sunday evening while firefighters worked.

Firefighters got the blaze under control at 6:45 p.m., according to the news release. Just before 9 p.m., the fire was extinguished and firefighters cleared the scene.

Firefighters battle a third alarm structure fire in Thetford on Sunday evening, June 21, 2026. The fire started in a barn and spread to the attached house. The barn was a complete loss and the home was damaged. Route 113 was closed to traffic during the incident. JENNIFER HAUCK Valley News

Clare Shanahan can be reached at cshanahan@vnews.com or 603-727-3216.