Will the addition match my existing house?

That is the whole objective. We match siding, trim profiles, roof pitch, and window proportions so the addition reads as original rather than appended.

Can you do the foundation too?

Yes - excavation, foundation, framing, roofing, and finish are all handled in-house or directly managed by us. One contract, one crew.

Addition Contractor in Marlborough, MA

New square footage that looks like it was always there

(508) 598-8704

Free Addition Estimate

No cost, no obligation. We reply within 24 hours.

An addition is the most demanding thing a residential builder does: new foundation, new framing tied into old, roof lines that have to resolve honestly, and mechanicals extended from systems sized for a smaller house. We do all of it.

Problems We Fix

The bolted-on look

Mismatched rooflines, siding that doesn’t align, and window proportions that give it away instantly from the curb.

Leaks where old meets new

The junction between existing and added structure is the single most common failure point, and the hardest one to fix afterward.

Zoning discovered too late

Setbacks, lot coverage, and septic capacity kill more additions than budget does - and usually after money has been spent on design.

What's Included

Single-room and multi-room additions
Second-story additions
Primary suite and in-law additions
Garage and mudroom additions
Foundation, excavation, and slab work
Full framing, roofing, siding, and finish

Addition by Town

FAQ

Addition Questions

Setbacks, lot coverage limits, and septic capacity decide it. We check those against your town’s requirements during the free estimate, before anyone spends money on drawings.

(508) 598-8704
190 Bolton St, Unit 11, Marlborough, MA 01752
@ofirconstruction
Serving all of Massachusetts

Free Estimate

Get Your Free Construction Estimate

Call and we answer during business hours. Prefer to write it down? The request form is at the top of this page.

(508) 598-8704 Go to the estimate form

No obligation and no cost for the estimate. We reply within 24 hours and we don't share your details.