Home addition contractors in Boulder

48 contractors, the ones with the most home addition jobs first. City permits, September 2021 to September 2026. See what home additions cost.

A house with new framing and plywood walls for more rooms
RankContractorJobsTypical permit valueMost work inContact
1Melton Design Build dba Melton Construction Inc
4 jobs since October 2025
18
$97,64480304, 80305Get a quote
2Sobo Design & Build
4 jobs since October 2025
18
$325,50080305, 80303Get a quote
3Decks By Caio
15 of 22 jobs are additions, 7 since October 2025
15
$13,09380304, 80305Get a quote
4O'keefe Built, Inc
15 of 16 jobs are additions, 5 since October 2025
15
$26,90880305, 80303Get a quote
5Trad Design Build LLC
1 job since October 2025
15
$350,00080305, 80302Get a quote
6High Plains Renovation Ltd
All 13 jobs are additions, 12 since October 2025
13
$7,00080301Get a quote
7Heartwood Builders, Inc
3 jobs since October 2025
10
$147,50080304, 80305Get a quote
8Smiley Inc
1 job since October 2025
9
$100,00080302, 80304Get a quote
9Pr Builders Dba Ace Septic and Excavation
2 jobs since October 2025
8
$270,00080305, 80304Get a quote
10Elton R Construction, LLC
1 job since October 2025
6
$179,87580304, 80302Get a quote
11Polaris Contractors LLC
6 of 11 jobs are additions
6
$12,97080304, 80305Get a quote
12Running Rabbit Home Building Inc
6
$105,76580303, 80305Get a quote
13Squareroot Construction
All 6 jobs are additions
6
$19,00080303, 80301Get a quote
14Tectonic Design Build LLC
1 job since October 2025
6
$212,27280304, 80305Get a quote
15Western Sky Designs
All 6 jobs are additions
6
$12,00080303, 80305Get a quote
16Cosman Construction
All 5 jobs are additions, 2 since October 2025
5
$45,00080305, 80301Get a quote
17Denver Decks, LLC
All 5 jobs are additions
5
$8,00080304, 80305Get a quote
18Ellsworth Builders, Inc
5 of 7 jobs are additions, 1 since October 2025
5
$54,00080304Get a quote
19Factor Design Build
5
$600,00080305, 80304Get a quote
20Phoenix Remodeling
1 job since October 2025
5
$227,00080305Get a quote
21Rob Luckett Builders
2 jobs since October 2025
5
$200,00080304, 80302Get a quote
22Sacred Spaces Design Build
2 jobs since October 2025
5
$85,00080305, 80304Get a quote
23Apex Builders, Inc
1 job since October 2025
4
$46,00080304, 80302Get a quote
24Ascent Cms, Ltd
1 job since October 2025
4
$350,00080304, 80305Get a quote
25Chris Kelley Contracting
4
$59,02480305Get a quote
26Colorado Choice Builders
4
$92,50080304, 80305Get a quote
27Cottonwood Custom Builders Inc
4
$77,26080304, 80302Get a quote
28Kdt Construction Ltd
1 job since October 2025
4
$150,00080304, 80302Get a quote
29Living Stones Construction
3 jobs since October 2025
4
$275,00080305, 80303Get a quote
30Rer Properties LLC
4
$115,00080305, 80304Get a quote
31Timberline Builders
4
$84,50080305Get a quote
322q Homes
3
$150,00080304, 80302Get a quote
33Anderson Garcia Construction
3
$213,95680302, 80305Get a quote
34Bannockburn Enterprises
3
$195,00080302, 80305Get a quote
35Coburn Development, Inc
2 jobs since October 2025
3
$313,43780305, 80304Get a quote
36Colorado Custom Decks
1 job since October 2025
3
$45,00080304, 80303Get a quote
37Ellis Construction Inc
1 job since October 2025
3
$950,00080305, 80303Get a quote
38Gj Koeppen Construction
3
$18,00080304, 80302Get a quote
39Greer Construction Inc
3
$25,50080304, 80305Get a quote
40Ironwood Decks LLC
3
$13,23480301, 80304Get a quote
41K&a Construction
1 job since October 2025
3
$35,00080305, 80302Get a quote
42Kennedy Building, Inc
3
$112,00080302, 80305Get a quote
43Krueger Construction Mgmt
1 job since October 2025
3
$542,00080305, 80304Get a quote
44Milestone Remodeling Ltd
1 job since October 2025
3
$120,00080302, 80303Get a quote
45Pearl Construction LLC
3
$120,00080302, 80304Get a quote
46Rosewood Construction Inc
1 job since October 2025
3
$22,24480304, 80301Get a quote
47Services Rendered Inc (sri)
3
$28,00080305, 80302Get a quote
48Upland Construction and Development LLC
3
$33,89280304Get a quote

Boulder publishes no contractor license list we can check, so this list counts permits only. Ask for the license number and check it with the state before you hire. Typical permit value is the job value written on the permit, which can differ from the final price.

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Paying for your addition

Three common ways. Compare the total you will repay, not the monthly payment.

  • Home equity line of creditBorrow against what your home is worth. Rates are usually lower, but your home secures the loan, and approval takes a few weeks.
  • Personal loanNo collateral and a fast answer. Rates are usually higher and you repay sooner.
  • Contractor financingMany contractors offer a plan through a lender. Get the rate, fees and total cost in writing, then compare it with your bank.