Room additions and home extensions

What you can build is decided before design

Before anyone draws a floor plan, three things set the boundaries, and all of them come from the Village and your lot rather than from what you want.

• Setbacks. How close to the front, side and rear property lines you are allowed to build. This is the constraint that most often reshapes an addition.
• Lot coverage. How much of your lot can be under roof and hard surface. A big house on a modest lot can already be near the limit.
• Easements. Utility easements running along a property line are not buildable, and people are often surprised to learn one crosses their back yard.

We check these at the start, because there is no point designing a family room that zoning will not allow. Where a plan does not fit, there is sometimes a variance route through the Village — that takes time and it is not guaranteed, so you want to know early.

The sequence

• Feasibility. Setbacks, coverage, easements, and a look at how the addition will tie into the existing structure.
• Drawings. Additions need architectural and structural drawings — this is not a job you can permit off a sketch.
• Permit and village review. Plan review takes as long as it takes. It is the least predictable part of the schedule and we will not pretend otherwise.
• Foundation. Excavation, footings below the frost line, foundation walls, backfill.
• Framing and roof tie-in. Where the new roof meets the old is the detail that decides whether you ever have a leak.
• Dry-in. Roofing, windows, doors and housewrap, so the inside is protected.
• Mechanicals. Electrical, plumbing and HVAC, then rough inspection.
• Insulation, drywall, trim, floors, paint.
• Final inspection and walkthrough.

Two things people underestimate

Your furnace may not cover it

An addition adds volume your existing HVAC was never sized for. Sometimes an extra run is enough; sometimes it means a bigger system or a separate mini-split for the new space. Either way it belongs in the plan and the budget from the start, not as a discovery in the first winter.

Matching the outside of the house

New siding next to twenty-year-old siding will not match, because the old material has weathered. Same with brick and roof shingles. There are ways to handle this — carrying the new material to a natural break line, or re-siding an entire elevation — but it is a decision to make deliberately, in advance, rather than to discover at the end.

Garage conversions

Turning a garage into living space is the cheapest way to add a room, because the foundation and roof already exist. What it needs is insulation, a proper floor build-up, heating, egress-compliant windows, and something done about the big door opening. It is also worth thinking about where the cars and the storage go afterwards, and what losing a garage does to resale on your street.

Common questions