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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
RankContractorLicenseJobsTypical jobMost work inContact
1Melton Design Build dba Melton Construction Inc
4 jobs since October 2025
Not checked
18
$97,64480304, 80305Get a quoteVisit website
2Sobo Design & Build
4 jobs since October 2025
Not checked
18
$325,50080305, 80303Get a quoteVisit website
3Decks By Caio
15 of 22 jobs are additions, 7 since October 2025
Not checked
15
$13,09380304, 80305Get a quoteVisit website
4O'keefe Built, Inc
15 of 16 jobs are additions, 5 since October 2025
Not checked
15
$26,90880305, 80303Get a quote
5Trad Design Build LLC
1 job since October 2025
Not checked
15
$350,00080305, 80302Get a quoteVisit website
6High Plains Renovation Ltd
All 13 jobs are additions, 12 since October 2025
Not checked
13
$7,00080301Get a quote
7Heartwood Builders, Inc
3 jobs since October 2025
Not checked
10
$147,50080304, 80305Get a quote
8Smiley Inc
1 job since October 2025
Not checked
9
$100,00080302, 80304Get a quote
9Pr Builders Dba Ace Septic and Excavation
2 jobs since October 2025
Not checked
8
$270,00080305, 80304Get a quote
10Elton R Construction, LLC
1 job since October 2025
Not checked
6
$179,87580304, 80302Get a quote
11Polaris Contractors LLC
6 of 11 jobs are additions
Not checked
6
$12,97080304, 80305Get a quote
12Running Rabbit Home Building Inc
Not checked
6
$105,76580303, 80305Get a quote
13Squareroot Construction
All 6 jobs are additions
Not checked
6
$19,00080303, 80301Get a quote
14Tectonic Design Build LLC
1 job since October 2025
Not checked
6
$212,27280304, 80305Get a quote
15Western Sky Designs
All 6 jobs are additions
Not checked
6
$12,00080303, 80305Get a quote
16Cosman Construction
All 5 jobs are additions, 2 since October 2025
Not checked
5
$45,00080305, 80301Get a quote
17Denver Decks, LLC
All 5 jobs are additions
Not checked
5
$8,00080304, 80305Get a quote
18Ellsworth Builders, Inc
5 of 7 jobs are additions, 1 since October 2025
Not checked
5
$54,00080304Get a quote
19Factor Design Build
Not checked
5
$600,00080305, 80304Get a quote
20Phoenix Remodeling
1 job since October 2025
Not checked
5
$227,00080305Get a quote
21Rob Luckett Builders
2 jobs since October 2025
Not checked
5
$200,00080304, 80302Get a quote
22Sacred Spaces Design Build
2 jobs since October 2025
Not checked
5
$85,00080305, 80304Get a quote
23Apex Builders, Inc
1 job since October 2025
Not checked
4
$46,00080304, 80302Get a quote
24Ascent Cms, Ltd
1 job since October 2025
Not checked
4
$350,00080304, 80305Get a quote
25Chris Kelley Contracting
Not checked
4
$59,02480305Get a quote
26Colorado Choice Builders
Not checked
4
$92,50080304, 80305Get a quote
27Cottonwood Custom Builders Inc
Not checked
4
$77,26080304, 80302Get a quote
28Kdt Construction Ltd
1 job since October 2025
Not checked
4
$150,00080304, 80302Get a quote
29Living Stones Construction
3 jobs since October 2025
Not checked
4
$275,00080305, 80303Get a quote
30Rer Properties LLC
Not checked
4
$115,00080305, 80304Get a quote
31Timberline Builders
Not checked
4
$84,50080305Get a quote
322q Homes
Not checked
3
$150,00080304, 80302Get a quote
33Anderson Garcia Construction
Not checked
3
$213,95680302, 80305Get a quote
34Bannockburn Enterprises
Not checked
3
$195,00080302, 80305Get a quote
35Coburn Development, Inc
2 jobs since October 2025
Not checked
3
$313,43780305, 80304Get a quote
36Colorado Custom Decks
1 job since October 2025
Not checked
3
$45,00080304, 80303Get a quote
37Ellis Construction Inc
1 job since October 2025
Not checked
3
$950,00080305, 80303Get a quote
38Gj Koeppen Construction
Not checked
3
$18,00080304, 80302Get a quote
39Greer Construction Inc
Not checked
3
$25,50080304, 80305Get a quote
40Ironwood Decks LLC
Not checked
3
$13,23480301, 80304Get a quote
41K&a Construction
1 job since October 2025
Not checked
3
$35,00080305, 80302Get a quote
42Kennedy Building, Inc
Not checked
3
$112,00080302, 80305Get a quote
43Krueger Construction Mgmt
1 job since October 2025
Not checked
3
$542,00080305, 80304Get a quote
44Milestone Remodeling Ltd
1 job since October 2025
Not checked
3
$120,00080302, 80303Get a quote
45Pearl Construction LLC
Not checked
3
$120,00080302, 80304Get a quote
46Rosewood Construction Inc
1 job since October 2025
Not checked
3
$22,24480304, 80301Get a quote
47Services Rendered Inc (sri)
Not checked
3
$28,00080305, 80302Get a quote
48Upland Construction and Development LLC
Not checked
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 job is the middle job value written on their permits, which can differ from the final price.

Get quotes from up to 3 home addition contractors

Five quick questions. We send your request to up to 3 contractors who work near you, and email you who they are.

You decide who to hire. Your details go only to the contractors you pick. How we use your details

1. Where is the job?

We match contractors who work near it. We never ask for your street address.

2. What do you need?

Pick any that fit.

3. When do you want to start?
4. What is your rough budget?

A range is fine. It helps contractors reply with a real number.

5. Where should we send it?

Your contact details go only to who you pick here.

Sent. We have your request.

Over the next few days we email you up to 3 contractors who fit, and pass your request to them. Replies usually come within a few days.

Your job room keeps the request, your photos and every reply in one place, with an assistant that checks prices against city permits. Keep its link: it is the key to your job.

Open your job room

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.