Finishing a basement is the cheapest square footage you’ll ever add to a Front Range home — the foundation, roof, and walls are already paid for. Here’s what it actually costs in 2026 and what to watch for before you sign anything.
Basement Finishing Cost in Longmont: 2026 Numbers
For a standard 800–1,200 sq ft basement in Longmont, expect $38,000–$75,000 for a full finish: framing, electrical, drywall, flooring, and a 3/4 bath. A basic open rec room starts around $32,000. Adding a legal bedroom means an egress window ($3,500–$5,500 installed) — no exceptions, it’s life-safety code.
Our basement finishing Longmont CO page breaks down the full process, but the short version: permits through the City of Longmont run 4–6 weeks right now, and any bid that skips permitting should end the conversation.
Finishing a Basement in Erie
Erie’s newer subdivisions — Vista Ridge, Colliers Hill, Erie Highlands — have basements that are practically begging to be finished: 9-foot ceilings, rough-in plumbing already stubbed, straight walls. That cuts labor significantly versus older Longmont homes. See our dedicated basement finishing Erie CO page for subdivision-specific details.
What Drives the Price
Three things move the number more than anything else: bathrooms (wet walls are expensive), ceiling treatment (drywall vs. drop), and whether your furnace room needs relocation or fire-rated enclosure. A wet bar adds $6,000–$15,000 depending on plumbing runs.
Why Homeowners Pick Us
Josh Brooks Construction and Renovation Inc. is licensed in Boulder County (CON-24-0152), fully permitted on every basement remodeling Longmont CO project, and Josh has been in construction since 1996 — 30 years of Front Range builds. Senior and veteran homeowner discounts available.
Call 720-828-7997 or text 720-453-5095 for a free basement walkthrough and firm quote.
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