Castle Custom Mechanical LLC
Heat pump installer based in South Prairie.
- License active
- No current bond on the state's list for this license
15 heat pump jobs on Seattle permits, 2021 to 2025. 90th most heat pump permits of 197 contractors in Seattle.
What the public records show
From the state's license records and the city's permits, one question at a time.
| Question | Records show | Mark |
|---|---|---|
| Licensed? | License CASTLCM908O2, active in the state's records on Oct 3, 2026Construction contractor | Checks out |
| Insurance and bond? | No current bond on the state's list for this licenseLiability insurance $1,000,000 on file with the state, until Jul 3, 2027. | Ask them |
| Jobs on record | 15 heat pump jobs on Seattle permits, 2021 to 2025Every permit we have for them is heat pump.They are based in South Prairie. Work outside Seattle is not in these records.90th most heat pump permits of 197 licensed contractors in Seattle. That counts jobs, not quality.Our Seattle permit records cover October 2021 to October 2026.Of their 15 heat pump permits, 15 mention ductless or mini-split units, 3 mention ducts or a ducted system. |
Records: the state Department of Labor and Industries and City of Seattle permits.
Cost and timing
All heat pump jobs in Seattle: $6,000 to $15,000
Half of 25,747 city permits list an amount in this range. Permit amounts are often lower than what you pay.
- Ductless mini-splits in Seattle: $6,000 to $15,000 (10,687 permits)
- Ducted heat pumps in Seattle: $9,000 to $22,000 (591 permits)
How to read this range
Contractors write a job value on the permit form, and the city uses it to set the permit fee. It is not the contract price, and it is often lower than what you pay. A quarter of the permits list less than this range, and a quarter list more. Use it to see if a quote is in the normal range.
Rebates
Seattle's Clean Heat Program: $2,000 off for most homes that switch from oil heat to a Mitsubishi Electric heat pump. Households earning 81% to 150% of the area median income get $4,000 more, $6,000 in all. The install must be finished by May 30, 2027, by one of the program's participating contractors.
As the city's page read in October 2026. Check it for changes.
Permit value (not a price)
Their typical permit lists $10,000 (half list more, half less)
That is the figure written on the permit form, which can be far from what you pay. What heat pump jobs cost in Seattle.
Get 2 or 3 written quotes.
Permit timeline
Across Seattle, a heat pump permit stays open about 87 days, from permit to final inspection
This is not how long the crew works at your home: most of it is waiting for the inspection. Ask them how many days the work takes. The permit itself is usually issued the same day. How long heat pump jobs take.
Track record
Jobs per quarter
Where they work most
- 981184 jobs
- 981992 jobs
- 981072 jobs
- 981161 job
- 981441 job
Latest jobs
Permit values are what the contractor wrote on the permit form, not what the owner paid.
| Date | Work | ZIP | On the permit form |
|---|---|---|---|
| Nov 20, 2025 | Heat pumpMini-Split Systems, ventilation | 98116 | $30,000 |
| Mar 4, 2024 | Heat pumpInstall (5) one to one mini-split systems; unit ventilation and (4) HRV systems, per plan | 98144 | $90,000 |
| Jan 19, 2024 | Heat pumpInstallation OF 2 HEAD MINI-SPLIT SYSTEM AND VENTILATION | 98199 | $10,000 |
| Nov 30, 2023 | Heat pump2 mini-split heat pump systems. Unit ventilation | 98126 | $15,000 |
| Nov 27, 2023 | Heat pumpInstall a 4 head mini-split system | 98199 | $10,000 |
| Nov 20, 2023 | Heat pumpInstall a Multi zone Mini-Split system | 98118 | $10,000 |
| Oct 26, 2023 | Heat pumpInstall 5 mini-Splits | Not listed | $80,000 |
| Aug 31, 2023 | Heat pumpMini-split 2 head system | 98118 | $15,000 |
| Aug 7, 2023 | Heat pumpInstallation of a 2 ton Mini-Split system | 98121 | $10,000 |
| Aug 30, 2022 | Heat pumpLine set for mini split | 98107 | $10,000 |
| Aug 15, 2022 | Heat pumpDucted Mini-Split System | 98107 | $10,000 |
| Aug 15, 2022 | Heat pumpDucted Mini-Split System | 98117 | $10,000 |
| Feb 16, 2022 | Heat pumpInstall 2 Mini-Split Ducted Systems | 98118 | $15,000 |
| Oct 25, 2021 | Heat pumpMini-Split System | Not listed | $10,000 |
| Oct 20, 2021 | Heat pumpMini-Split System | 98118 | $7,000 |
What to ask before you hire
About Castle Custom Mechanical LLC
- Ask for proof of a current bond.
- Ask whether they are on the city's participating list, which rebates apply to your job, and who files the paperwork.
- Ask what the warranty covers and for how long, in writing.
- Search their name on the Better Business Bureau site, and read their reviews.
Worth asking any heat pump installer
- Can you show me proof of liability insurance and your bond?
- What size unit, and did you measure the house to choose it?
- Do my ducts or my electrical panel need work first?
- Who pulls the permit, and what rebates apply?
Get a quote from Castle Custom Mechanical LLC
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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 roomMore heat pump installers near 98118 and 98199
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See all 197 heat pump installers in Seattle, ranked by jobs
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