Cornerstone Mechanical In
Heat pump installer based in Bayside.
- License active
4 heat pump jobs on New York permits, 2024 to 2026. 53rd most heat pump permits of 118 contractors in New York.
What the public records show
From the city's license records and the city's permits, one question at a time.
| Question | Records show | Mark |
|---|---|---|
| Licensed? | License 619224, active in the city's records on Sep 24, 2026General contractor | Checks out |
| Jobs on record | 4 heat pump jobs on New York permits, 2024 to 2026Every permit we have for them is heat pump.They are based in Bayside. Work outside New York is not in these records.53rd most heat pump permits of 118 licensed contractors in New York. That counts jobs, not quality.Our New York permit records cover September 2021 to September 2026.Of their 4 heat pump permits, 3 mention ductless or mini-split units, 1 mention ducts or a ducted system. |
Records: the city Department of Buildings and City of New York permits.
Cost and timing
Permit value (not a price)
Their typical permit lists $37,500 (half list more, half less)
That is the figure written on the permit form, which can be far from what you pay. Across New York the middle heat pump job is $35,000.
Get 2 or 3 written quotes.
Permit timeline
Across New York, a heat pump permit stays open about about 6 months, 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. Waiting for the permit adds about 57 days. How long heat pump jobs take.
Track record
Where they work most
- 100251 job
- 112151 job
- 113681 job
- 112211 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 |
|---|---|---|---|
| May 7, 2026 | Heat pumpInstallation of split system air conditioning comprising rooftop condensing units and interior… | 10025 | $30,000 |
| Jun 24, 2025 | Heat pumpNew Heating, Ventilation, Air Conditioning, System per DOB approved plans with associated equipment… | 11215 | $45,000 |
| Oct 31, 2024 | Heat pumpFiling herewith mechanical application for the installation of 8 new minisplit systems | 11368 | $60,000 |
| Mar 6, 2024 | Heat pumpPropose new mini split systems, kitchen and toilet exhaust, all as per as | 11221 | $25,200 |
What to ask before you hire
About Cornerstone Mechanical In
- 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 Cornerstone Mechanical In
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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.
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