104 Emerald St, Keene, NH  ·  Mon–Sat 8:30–6, Sun 11–3 (603) 795-0100 Book a Consult

Home / Build / Basements

The cheapest square footage in the house — done right

A finished basement is the best dollar-per-foot space you can add. But only if the water and the air are handled first. We do both before a single stud goes up.

Typical on-site window: 5–8 weeks Moisture-managed · insulated · code-compliant Egress, permits and inspections handled
Before the pretty part

Water and air come first

01

Moisture control

Interior drainage, sump and vapor management as needed — so the finished space stays dry through mud season.

02

Insulation & air sealing

Continuous insulation on the walls and rim, sealed penetrations, and a plan for humidity — the difference between a warm room and a cold one.

03

Egress & code

A code-compliant egress window or door where a bedroom is planned, plus smoke/CO and the permit set.

04

Layout

Family room, home office, gym, guest suite, bar or workshop — planned around the mechanicals that have to stay.

05

Finishes

LVP or engineered flooring, drop or hung ceilings for access, recessed lighting and the trim that makes it read as living space.

06

The extras

Wet bars, media walls, egress wells and full baths — built by the same crew, off one plan.

What does finishing a basement cost?

Roughly $28k–$55k for an average basement at a mid finish level, more with a full bath or wet bar. Run the budget calculator.

My basement gets damp. Can it still be finished?

Usually — but the moisture has to be solved first, not covered up. We'll tell you honestly at the consult whether it's a drainage fix or a bigger issue.

Can I add a bedroom down there?

Yes, with a compliant egress window or walk-out and the right ceiling height. We handle the permitting.

Start here

Book a consult

Tell us the room, a rough budget range and when you'd like to start. We'll come back with next steps and a realistic timeline — no pressure, no mystery pricing.

(603) 795-0100  ·  toll-free 844-438-7674 sales@poshhaus.com 104 Emerald St, Keene, NH 03431 Mon–Sat 8:30–6 · Sun 11–3

We reply within one business day. Your details go straight to our team at sales@poshhaus.com.