Home Addition in Bloomington

What’s included in a Knutson home addition

Structural evaluation — before any design work, we assess whether your existing rambler’s foundation and load-bearing walls can support a second story, or whether a ground-floor addition is the more realistic path.

Design and permitting — a design that matches your home’s existing roofline and siding, with all City of Bloomington permits filed and inspections scheduled.

Foundation and framing — reinforcement where an existing wall needs upgrading, and new framing tied into the original structure correctly, not patched together.

Electrical and HVAC extension — new circuits and duct runs sized for the added square footage, not borrowed capacity from a system that was never sized for it.

Plumbing — full rough-in for any addition including a bathroom or kitchenette.

Custom built-ins and finish work — cabinetry and millwork built in our own shop, with drywall, flooring, trim, paint, and lighting carried to match the rest of the house.

Why Bloomington homeowners choose Knutson

A second-story addition on a rambler that was never structurally designed for one is exactly how a project runs into expensive surprises mid-construction. We check foundation and wall capacity before design, not during framing, so the plan we price is the plan we can actually build.

Bloomington’s ramblers also come with an eight-foot ceiling height on the main floor that most additions should match rather than fight, and we design new construction to read as part of the original house, not an obviously newer addition bolted on top.

What a Bloomington Addition Actually Costs

The number changes a lot depending on whether your rambler can carry a second story outright or needs reinforcement first, and that’s exactly why we don’t quote off a square-footage guess. A ground-floor room addition or bump-out typically runs $60,000 to $110,000. Add a second story on top of an existing rambler, including any foundation or wall reinforcement the structural evaluation calls for, and the range moves to $150,000 to $280,000. The gap between those two numbers is almost entirely the structural work — framing a room is the easy part.

How Long a Bloomington Addition Actually Takes

Plan on four to eight weeks of design and structural evaluation before a shovel ever goes in the ground — that’s not wasted time, it’s the phase where we confirm whether your specific rambler needs reinforcement. Once that’s settled, construction runs ten to sixteen weeks for a ground-floor addition. A second story with structural work stretches closer to five or six months from groundbreaking to final walkthrough, and we’d rather tell you that upfront than have a schedule slip halfway through.