Callahan Builders
(508) 555-0121 See our work
Worcester County & MetroWest

Additions and custom homes, built right.

Additions, custom builds and whole-house renovation, run on one schedule with one person answering the phone all the way through.

5.0 · 96 Google reviews Licensed & insured Booking 2027
27
Years in business
310+
Projects completed
5.0★
Average rating
91%
Repeat & referral
What we do

The jobs families circle for a year before they call

Big, disruptive, expensive work — sequenced so you always know what month it is.

Additions

Bump-outs, second storeys and in-law suites, engineered and permitted.

Custom Homes

Ground-up builds on your lot, with a fixed schedule and open books.

Whole-House Renovation

Down-to-studs work staged so the house stays liveable where it can.

Structural Work

Beams, foundations and the things you find once the wall is open.

Project Management

One manager, one schedule, weekly updates you don't have to chase.

Design-Build

Architect and builder under one contract, so nobody blames the other one.

Recent work

Work we have finished around Worcester

A few of the jobs we have finished this season.

Additions
Custom Homes
Whole-House Renovation
Structural Work
Project Management
Design-Build
Brian CallahanOwner · Callahan Builders
Our story

Twenty-seven years, and nine out of ten jobs come from someone we already built for

Brian started swinging a hammer in 1999 and still walks every job site most mornings. Callahan doesn't advertise much — ninety-one percent of the work comes from repeat clients and referrals — which means the only thing keeping the business alive is whether the last family would hire us again.

Brian on site, most mornings, on every job
Open-book allowances — you see the real supplier invoices
Written weekly schedule updates from day one
5.0 average

Families who'd hire them again — and did

Second project with Callahan. Same crew, same manager, same price discipline. That's why there was a second one.

D
Dave & Erin S.
Shrewsbury

They found rot in the sill and showed me the invoice for the fix instead of guessing at a number.

M
Marcia L.
Holden

An addition through a New England winter, finished the week they said. I'm still impressed.

K
Ken A.
Westborough
How it works

Site visit, drawings, build

1

We walk the property

An honest conversation about scope and budget before anyone draws anything.

2

Design and fixed schedule

Drawings, permits, and a month-by-month schedule you'll be held to as much as we are.

3

Build with open books

Allowances shown at real cost, weekly updates, one manager throughout.

Ready to stop talking about it at dinner?

Free site visits, and we'll tell you honestly if the budget doesn't fit the idea.

Get in touch

Book a site visit

Tell us roughly what you're imagining and we'll come look and talk real numbers.

(508) 555-0121
Worcester County & MetroWest
Mon–Fri 7am–5pm