Basement finishing in Longmont helps you make space for family, guests and work. Typical full finish, metro Denver: $30K to $90K, from one local builder's 2026 cost guide. Your address and project scope determine the quote. Fill out the form and we'll be in touch.
Basement finishing and permit planning in Longmont
Longmont Building Inspection
The City of Longmont Building Inspection Division reviews and issues permits at the Development Services Center. Plans can be emailed or dropped off. Your contractor submits them.
Licensed subs only
Anyone hired to work on a Longmont home must be insured and licensed with the city. That covers the electrician and the plumber too. Your contractor uses licensed trades.
Make room for everyday life
A family room, home office or guest suite makes better use of the space you already own. Start with the layout, light and moisture before choosing finishes.
Longmont basement guide
Applying for a Longmont basement finish permit
How do I get a permit to finish a basement in Longmont?
Longmont lists four steps for a basement finish permit, and your contractor handles each one. The plan reviewer sets the fee after approval, so the permit cost is known before you pay. An approved set of plans must be on site for every inspection.
The steps are:
Review the city's Basement Finish Guidelines
Complete a Residential Remodel/Addition Application with a full basement floor plan, dimensions and room labels
Email the application and plan as PDFs or drop them off at the Development Services Center, 385 Kimbark Street
Pay the permit fees and pick up the approved plans once the plan reviewer emails you
What smoke and carbon monoxide alarms does Longmont require?
Longmont requires hardwired, interconnected smoke alarms in new and existing bedrooms, halls and on each level. Battery alarms are allowed where hardwiring would mean removing wall or ceiling finishes.
Carbon monoxide alarms go outside each separate sleeping area within 15 feet of the bedrooms. They must be interconnected too. Combination smoke and carbon monoxide alarms are allowed. Because the rules cover existing bedrooms and halls, a basement permit can mean new alarms upstairs too.
How are Longmont basement inspections scheduled?
Longmont inspections are requested online or by voicemail, and requests made by 4 p.m. are done the next business day. The permit card and site address must stay posted on site.
Inspectors will not inspect work done by an unlicensed subcontractor. A morning or afternoon slot can be requested, but a set time may not be possible. The city advises against booking concrete or other major work on an inspection day. Keep pets away from the areas being inspected.
What if basement work in Longmont is done without a permit?
Unpermitted work can leave you liable if a fire or accident is traced to it. Longmont's basement guide also warns that insurance could be invalidated in some cases.
A permit puts the work through plan review and inspection. The approved plans and final inspection stay on record for the house. That record gives a buyer something to check when you sell.
What does a full basement finish cost near Longmont?
Published metro Denver benchmark
$30K to $90K
Typical full finish, metro Denver. Source: one local builder's 2026 cost guide, checked September 2026. Your address and scope determine the quote; this is not a price for every remodel.
Straight answers. Ask your contractor anything else at the free estimate.
Does Longmont have a basement finish guide in Spanish?
Yes, the city posts a Spanish version titled Un Sotano Residencial Acabado next to the English guidelines.
Are Longmont basement plans reviewed in order?
Yes, plans are reviewed in the order they are received. A complete set avoids a second trip through the queue.
What rules cover noise and debris during a Longmont basement job?
The Longmont Municipal Code bans unreasonable noise and requires debris and trash to be contained on the job site. Your contractor plans work hours and a dumpster to match.
Can a Longmont homeowner work without a contractor's license?
Yes, a homeowner can work on the home they live in without a contractor's license. You then schedule the inspections and see the permit through to final.
Your project
Let's talk about your Longmont basement
What happens next
1We'll be in touch about your project.
2Have your room ideas, measurements and budget ready for the discussion.
3Confirm availability and timing before arranging an estimate.
