Data through April 2026 · updated 20 Oct 2026
How much does siding installation cost in Boulder County? The usual siding job filed with Boulder County is $24,000, from 129 priced permits (May 2023 through April 2026); the middle half of firms file between $22,675 and $37,000. A filed value is what the contractor wrote on the permit, not a quote or the final bill.
The usual siding job filed with Boulder County is $24,000, from 129 priced permits, May 2023 through April 2026. The middle half of firms usually file between $22,675 and $37,000. Half of jobs were filed for less, half for more. A filed value is what the contractor wrote on the permit, not a quote or the final bill. A siding permit here usually takes 148 days from issue to final inspection. How long permits take →
Approximately, from each firm's own spread: every firm's range of filed values, weighted by its 129 priced permits across 37 firms, pooled into one. Half of Boulder County (unincorporated) siding permits were filed between $15,000 and $38,100.
| Percentile | Filed value | Reads as |
|---|---|---|
| 10th | $10,000 | 1 in 10 permits filed below |
| 25th | $15,000 | 1 in 4 filed below |
| 50th | $24,000 | the middle permit |
| 75th | $38,100 | 1 in 4 filed above |
| 90th | $56,800 | 1 in 10 filed above |
Firms split into thirds by the usual value of the homes they work on, with each third's usual filed value weighted by permits. Home values: Boulder County Assessor 2026 actual values.
| Firms working on | Usual home value | Usual filed value | Firms | Permits |
|---|---|---|---|---|
| Lower third | under $999,600 | $37,000 | 12 | 17 |
| Middle third | $999,600–$1,182,100 | $29,000 | 12 | 84 |
| Upper third | $1,200,000 and up | $29,728 | 13 | 30 |
Top 10 by permits in the last 12 months on file (May 2025–Apr 2026). Usual is each firm's middle filed value; middle half is the range its middle half of jobs were filed in; both are shown for firms with 5 or more priced permits. Busy is not the same as careful: pick what you value to build a list.
| Firm | Permits | Last 12 mo | Usual | Middle half | Finished |
|---|---|---|---|---|---|
| Mountain Safe Exteriors | 32 | 14 | $15,500 | $14,500–$19,625 | 61.7% |
| Westpro Ltd | 15 | 13 | $43,061 | $20,889–$59,325 | — |
| Northern Lights Exteriors | 17 | 7 | $29,000 | $24,000–$40,000 | 86.2% |
| GS Exterior Experts | 8 | 4 | $55,617 | $36,344–$58,470 | — |
| 5280EXTERIORS | 6 | 3 | $37,000 | $28,975–$39,250 | — |
| Lifetime Home Remodeling | 4 | 3 | — | — | — |
| Colorado Siding Repair, Inc | 3 | 3 | — | — | — |
| Ideal Siding Boulder | 2 | 2 | — | — | — |
| Scottish Home Improvements | 2 | 2 | — | — | — |
| Siding Repair Systems dba Koalaty Siding Repair | 3 | 1 | — | — | — |
Line your quote up against the file. In Boulder County (unincorporated), 1 in 10 siding filed values sit under $10,000, the middle half between $15,000 and $38,100, and 1 in 10 over $56,800.
Boulder County files the fewest siding permits in December (46 against an average month of 100) and the most in October (164). If you can choose, ask for quotes in a quiet month. We have no prices by month, so this is about crews' schedules, not a discount. When each trade is busiest in Boulder County →
Source: Boulder County Community Planning & Permitting building permits on homes in unincorporated Boulder County (the County's Accela permit layer, which stopped taking new applications on May 4, 2026, so the data ends with April 2026; the City of Boulder and the other cities issue their own permits), with issue dates and declared job values from the Boulder County Assessor's permit file. The window is May 2023 through April 2026; a permit filed after that isn't here yet.
Usual is the middle permit: half were filed for less, half for more. Only permits with a filed value count; a value of $0 or none is left out.
The spread is approximate: we keep seven points of each firm's own range of filed values, not every permit, and pool them.
Nobody paid to be on this page and nobody can. How the records work in Boulder County (unincorporated) → · Sources and definitions for every city →
Free to reuse with attribution (CC BY 4.0). Please credit Contractor Records and link to this page. Suggested citation:
Contractor Records, "Siding Installation Cost in Boulder County (unincorporated), CO: what the permits say", https://contractorrecords.com/boulder-county/siding-cost, data through April 2026, from Boulder County building-permit records.Link to a table: The spread · By home value · Busiest firms.
Download the tables (CSV): Key figures · By home value.
From our cross-city data studies: the same measure, read the same way, for every city we cover.
Siding cost in other cities: Cleveland Minneapolis Colorado Springs Saint Paul Cambridge Marin County (unincorporated)
Other job costs in Boulder County (unincorporated): Heating & Cooling · Roofing · Solar & Battery · Windows & Doors · Electrical · Plumbing & Water Heater · Remodel & Repair · Generator · Addition