Can you live in your house while building an addition?

Yes, in most cases, because the work happens outside your current walls for the first several weeks. The shared exterior wall stays closed until the roof, windows, and siding are on, then the connection is cut and finished in a few days.

How long does it take to add a bedroom to a house?

Roughly 14 to 16 weeks of construction for a ground-level bedroom, after design and permitting. Framing the egress window, running the electrical rough-in, passing the open-wall inspection, and finishing drywall and trim each take their turn, and weather during footings can add days.

How long does it take to build a 400 sq ft addition?

Around 14 to 16 weeks from first footing to final inspection for a 400 sq ft room on its foundation. Campbells Carpentry LLC in Warrenton, MO, schedules concrete, framing, and finish work back to back so the house stays open no longer than needed.

Do I need a foundation for an addition?

Any addition with a floor and a roof needs its own foundation, and locally that means footings at least 30 in. deep. Bump-outs of 2 or 3 ft can sometimes cantilever off the existing joists, which is the one exception worth asking about.

What is a bump-out addition?

A bump-out extends a room by 2 to 3 ft without a separate foundation, usually by cantilevering joists past the existing wall. It suits a kitchen needing a deeper counter run, a bath needing a soaking tub, or a closet needing shelves.

Can you add an addition with a basement to an existing house?

Building a basement under an addition works when the footprint is large enough to justify excavation. That foundation wall gets waterproofed before backfill, drains tie to a sump, and the two basements connect through an opening cut between them.

What requires a building permit in Missouri?

Missouri leaves permits to cities and counties, so rules differ by address. In Warrenton, MO, a room addition needs a permit and inspections, and the unincorporated county requires a structure permit for every addition. Campbells Carpentry LLC has walked both paths for 5+ years.

Is it better to build an addition or move?

Staying often wins when you like the lot, the school, and the mortgage rate, since a midrange bathroom addition recouped 53.2% of its cost in our region in 2025 and the rest is value you live in. Moving costs the same equity twice.

Home Additions | Warrenton, MO | Campbells Carpentry

Most ground-level additions take 14 to 16 weeks of construction once design and permits are done, and the footings under them must reach 30 in. below grade to clear the frost line. Campbells Carpentry LLC builds home additions across Warrenton, MO, Truesdale, and Foristell: bedroom additions, kitchen bump-outs, second-story additions, attached garages, sunrooms, and in-law suites. We tie the added roofline into the one you have, match the siding, and carry the floor level straight through the doorway.

The carpenter who measures your house for the estimate oversees the build in person, because we are a small, owner-operated company and prefer it that way. Across 5+ years of building onto local homes, we have learned to give honest recommendations, including telling you when a bump-out solves the problem better than a whole room. We do what we say we will do, and estimates are free. Request yours through our contact page and we will visit.