Residential Addition / Remodel Permit in Longmont, Colorado
Required for additions, remodels, basement finishes, and structural alterations to existing residential buildings in Longmont. Uses the same valuation-based Primary Fee Schedule as new construction. Filed as a 'Residential Remodel/Addition' application via the ACA portal.
Verified 2026-06-30 · Source
When you need this permit
- Building permit required for any addition or alteration to an existing building or structure
- Covers basement finishes, room additions, garage conversions, re-siding, retaining walls over 48 inches, and similar alterations
- Applications submitted via the Accela Citizen Access (ACA) portal, 'Residential Remodel/Addition' application type
- Homeowner may self-permit as own contractor on their own property
Required documents
- Req
Residential Remodel/Addition Application (via ACA portal)
Online application through Accela Citizen Access
- Req
Site Plan
Existing structures, proposed addition footprint, setbacks
- Req
Construction Drawings
Plans showing scope of addition/remodel, structural details where applicable
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Building Permit Fee — valuation-based (same Primary Fee Schedule as new construction) | $27.00 minimum, scaling to $6,448.55 + $4.20/$1,000 over $1,000,000 | City of Longmont FY2026 Fee Manual, Primary Fee Schedule — applies identically to additions/remodels based on project valuation |
| Plan Review Fee | 50% of the Building Permit Fee | FY2026 Fee Manual |
| Additional Plan Review (changes/revisions to plans) | $47.00 minimum charge (one hour) | FY2026 Fee Manual, Plan Review Fees table |
| Additional Plan Review (incomplete/changed submittal documents) | $47.00/hour | — |
Review timeline
~0–0 business days
Typical estimate — confirm current times with the Longmont building department
Inspection process
- 1
Foundation (if new footings)
Before concrete pour
- 2
Framing
After framing complete, before insulation or wall cover
- 3
MEP Rough-In
Electrical, plumbing, mechanical rough-in before walls closed
- 4
Final
All work complete per approved plans
Tips
- Longmont uses the same valuation-based Primary Fee Schedule for additions/remodels as for new construction — there is no separate flat-rate table for typical remodel scopes.
- Retaining walls over 48 inches require a building permit in Longmont; shorter walls may not.
- Basement finishes involving framing, electrical, or plumbing require a building permit with associated sub-trade permits.
Frequently asked questions
- Do I need a permit to finish my basement in Longmont?
- Yes. Basement finishing is listed explicitly as an example of an alteration requiring a building permit under the City of Longmont's Fee Manual. Any associated electrical, plumbing, or mechanical work requires the applicable sub-trade permits as well.
Sources & verification
Verified against official sources. Last reviewed 2026-06-30.
- City of Longmont — Building Services (Building Inspection Division), Development Services Center — official building department
- City of Longmont FY2026 Planning & Development Services Fee Manual (PDF)
- Applications for Permit — City of Longmont
Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Longmont building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
Other permits in Longmont
Get the AI compliance checklist
Upload your project scope, get a jurisdiction-specific checklist of everything you need. Coming soon.
We only use your email to send permit updates. No spam, unsubscribe anytime. Privacy.