Southland Mechanical INC
Heating/Vent/Air-Conditioning and Refrig (HVAC/R) · Based in Rancho Cucamonga, CA · Licensed in Washington · License #SOUTHMI758CL
Southland Mechanical INC has been registered with WA L&I since 2025, based in Rancho Cucamonga, CA. Current filings: $1,000,000 liability coverage through Oct 30, 2026. Principals on record since 2025.
How confident can you be in Southland Mechanical INC?
Are they licensed, bonded, and insured?
Active license and $1,000,000 liability on file — checked against WA L&I records, updated daily.
Are they who they say they are?
Not yet verified — Southland Mechanical INC hasn't claimed this listing. Own this business? Claim it free.
Do other pros stand behind them?
No endorsements yet from other licensed contractors in Rancho Cucamonga.
Do they have jobs on record?
Not yet measured — Southland Mechanical INC hasn't run jobs through Subser. Performance data comes from real jobs, not reviews.
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License facts
- License type
- CONSTRUCTION CONTRACTOR
- Effective date
- Feb 13, 2025
- Expiration date
- Feb 13, 2027
- UBI
- 605719009
- Business type
- Corporation
- Phone
- (909) 223-4546
- Location
- Rancho Cucamonga, CA 91730
Source: WA L&I contractor registration — checked Aug 18, 2026. Applies to every row above.
Registration is current through Feb 2027.
Is this your business? Claim it free to verify ownership — takes about two minutes.
Claim this free listingBond & insurance on file
| Insurance company | Amount | Agency | Effective | Expiration |
|---|---|---|---|---|
| Scottsdale Ins Co | $1,000,000 | — | Oct 30, 2025 | Oct 30, 2026 |
What the bond and insurance requirements mean for homeowners
To register as a specialty contractor in Washington, a business must file a $15,000 surety bond with the Department of Labor & Industries; general contractors file $30,000.
The bond is a limited fund a homeowner (or subcontractor or supplier) can make a claim against, through the courts, if a registered contractor fails to meet its obligations on a job. Contractors must also keep general liability insurance on file — at least $50,000 in property damage and $200,000 in public liability coverage, or a $250,000 combined single limit — which covers damage the contractor causes, not workmanship disputes. The rows above are the bond and insurance filings L&I publishes for this registration; whether a specific filing applies to a specific project depends on its dates and terms.
Principals
| Name | Start date |
|---|---|
| Brian Nicholas Dieterle | Feb 13, 2025 |
What is a Heating/Vent/Air-Conditioning and Refrig (HVAC/R) contractor licensed to do in Washington?
An HVAC/R specialty contractor is registered with WA L&I to install and service heating, ventilation, air-conditioning, and refrigeration systems. Electrical and mechanical work within HVAC systems may also require trade licenses administered separately by the state. As a condition of registration, contractors in this category file a $15,000 surety bond and proof of general liability insurance with WA L&I.
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Subser doesn't have reviews or star ratings. This page shows Southland Mechanical INC's WA L&I record — registration status, bond and liability coverage, and principals on file — plus any endorsements from other licensed contractors.
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Built from Washington State L&I public records, updated Aug 18, 2026. Subser doesn't do star ratings or reviews — just verified records.