Building Doctors
Licensed HVAC contractor in Los Angeles, California
Building Doctors holds CSLB licence 932241, active, licensed since 5 May 2009, rated 5.0 from 16 Google reviews. Bonded for $25,000 with Nationwide Mutual Insurance Company. Clean CSLB record, with no citations, complaints or legal actions disclosed.
Report card
- Licence activeCSLB #932241, class B, C20. Issued 5 May 2009, expires 31 May 2028.
- Licensed 17 yrsSince 5 May 2009.
- Bonded$25,000 with Nationwide Mutual Insurance Company, since 8 May 2026. California requires the same $25,000 bond of every contractor.
- Workers' comp insuredEverest Premier Insurance Company, policy 16765086, valid to 30 Dec 2026.
- Clean CSLB recordNo citations, complaints or legal actions disclosed.CSLB record
- On the BBB, not accreditedIts BBB rating, complaints and reviews are on its Better Business Bureau profile.BBB profile Complaints Reviews
- 60 building permits since 2020Pulled under this licence (City of Los Angeles, LADBS), most recently 10 May 2023.
Checked against the Contractors State License Board (CSLB) register on 3 Nov 2026.
About Building Doctors
Building Doctors provides home performance and energy-efficiency services for homes in the Los Angeles area.
- Serves
- Los Angeles, Santa Monica
- People on the licence
- Daniel Craig Thomsen (rmo / ceo / pres)
From Building Doctors's own website, read 3 Nov 2026. We only show what the site states.
Google reviews
5.0(16 reviews)David S★★★★★ 2 months ago
Dan and at Building Doctors has been an incredible resource for me. After purchasing our home, we ran into several issues involving our HVAC system, indoor humidity, bathroom ventilation, and grading/drainage around the property. Dan took the time to look at the house as a complete system and helped us understand what was actually causing the problems and how to properly address them. He spent a significant amount …
Tommy Dickie★★★★★ 4 months ago
I have a friend who works in the HVAC world (in policy work, consulting), and when he scoured through the Building Doctors evaluation and proposal on my home, he said "this is the most detailed scope of work bid I've ever seen". He was super impressed by everything I reported to him that Building Doctors was saying and doing, and my personal experience was terrific - they were communicative, honest, realistic, effici…
Rich Sondheimer★★★★★ 2 years ago
They are absolutely the best contractors I have dealt with in over 30 years as a homeowner. Their proposal was accurate and complete. Their work is excellent quality and was done on time. When there were problems due to unexpected issues (as there always are), they came up with great solutions and were always fair and reasonable. After they upgraded the insulation and replaced the HVAC in my house, my utility costs…
Jason Feinberg★★★★★ 11 years ago
We hired Building Doctors to do a sizable energy efficiency upgrade project. This included work in the attic, crawlspace, and major garage work to insulate, control temperature, control sound, etc. We are very happy with the service Dan and Building Doctors provided. The initial consultation was much friendlier and honest than the competition. We felt much more secure with Dan's knowledge and the quality of his init…
Fabiola Hensley★★★★★ 13 years ago
I want to tell everyone how happy I'm about the Building Doctors. We just participated in the Energy Upgrade California Program threw LA County and received $8500 towards my homes energy upgrades. Our heater and air conditioner where 20 years old and not doing the job that they use to do and our bills where going threw the roof (literally since the it turned out my ducts where leaking over 40%). So I found the Buildi…
Read all 16 reviews on Google Reviews and photos from Google, refreshed every 30 days.
Recent permits
Building permits pulled under licence #932241, from City of Los Angeles, LADBS open data. Locations are shown to ZIP code only.
- 10 May 2023 · HVAC · ZIP 913111 or 2 Family Dwelling
- 8 Apr 2023 · Electrical · ZIP 900651 or 2 Family Dwelling
- 8 Apr 2023 · Plumbing · ZIP 900651 or 2 Family Dwelling
- 6 Apr 2023 · Electrical · ZIP 900651 or 2 Family Dwelling
- 6 Apr 2023 · Plumbing · ZIP 900651 or 2 Family Dwelling
Why it ranks #48 of 1,106 HVAC contractors in Los Angeles
Score 89.5 / 100. Claiming this listing or using Theo never changes it. How we rank
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