Washington HVAC Service Agreement (Free Template + State Notes)

What Your Washington HVAC Contract Should Include

The builder formats these into a clean, professional agreement:

• Parties & Premises: Legal names, service address, site contact, access windows; attic/roof/mechanical-room access if applicable.
• Scope of Work: Repair/replace/maintain; split/packaged, cold-climate heat pumps, gas furnace/boiler & hydronic, mini-split/VRF, RTUs/DOAS; ERV/HRV; controls/BAS.
• Service Levels: Standard vs. emergency; after-hours; windstorm/heavy rain, snow/ice, and poor-AQI/wildfire smoke rescheduling language.
• Pricing Model: Flat-rate vs. time-and-materials; trip fee; parts handling/mark-up; optional ferry/coastal/island access and mountain mileage.
• Materials & Parts: OEM or equivalent; low-ambient/defrost controls; condensate freeze protection & overflow safeties (attic AHUs); curb adapters & wind/hail guards for RTUs; corrosion-resistant hardware/coatings for coastal sites.
• Customer Responsibilities: Filters, clearances, utilities, roof/elevator/crane access, HOA/condo/historic approvals, debris/water/snow removal for safe access.
• Warranty: Labor window; manufacturer pass-through; exclusions (misuse, neglect, wind/hail/flood/freeze/corrosion/overheat/smoke damage, non-payment).
• Code & Safety: Local permits/inspections; WSEC (Washington State Energy Code, IECC-based) and IMC with local amendments; EPA refrigerant rules; rooftop fall protection; crane/street-use permits where required.
• Change Orders: Written/e-signed authorization for hidden conditions and price changes.
• Payment Terms: Deposits/milestones; due-on-completion; late fees.
• Termination: For convenience vs. cause; cure periods; demobilization costs.
• Dispute & Venue: Washington law; optional county venue (King, Pierce, Snohomish, Spokane, Clark, Thurston, Kitsap, Whatcom, Yakima, Benton, Skagit, etc.).
• Licensing/Registration: Show your legal business name and L&I contractor registration; use properly licensed electrical administrators/journeymen and plumbing contractors when those scopes apply.

Washington-Specific Notes (Read Before You Sign)

Contractor registration & trades: Contractors register with the WA Department of Labor & Industries (L&I). Electrical and plumbing scopes require their own state licenses/inspections; list your legal company name and any applicable numbers on proposals and the contract.

Permits & inspections: Issued by the local AHJ (e.g., Seattle, Spokane, Tacoma, Vancouver, Bellevue, Everett, Kent, Yakima, Bellingham, Renton, Olympia). Confirm permit needs, plan review (RTUs/curb adapters/wind/seismic), fees, floodplain/coastal placement limits, and inspection timing before change-outs or new installs.

Codes: Jurisdictions enforce the WSEC and IMC (and IRC for residential) with WA amendments. If your scope triggers duct leakage testing, ventilation/ERV balancing, economizers/DOAS on certain RTUs, demand-control ventilation, or commissioning/controls, assign responsibilities and testing fees in the agreement.

Climate & geography: Include corrosion protection and wind anchorage for Pacific Coast/Sound sites, freeze protection for Cascade/Columbia Basin cold snaps, rain-entry protections and curb flashings for rooftops, and rescheduling language for windstorms, snow/ice, extreme heat, or poor-AQI smoke events.

Fuel-fired equipment: When gas/oil appliances are in scope, reference required trade credentials and safety steps (leak checks, venting/combustion air, CO testing).

Cooling-off (in-home sales): Covered home solicitations generally include a 3-business-day right to cancel. Attach the written notice when applicable.

Liens: Washington provides mechanic’s lien rights with specific notices/timelines—keep clear payment terms and retain proof of any required notices/waivers.

This page is general business guidance, not legal advice. Requirements can change—verify rules for your municipality and project type.

Example Pricing & Payment Terms (Washington)

Flat-Rate Example

Flat-Rate Replacement: Contractor will replace the condenser fan motor on the 4-ton split system at 600 4th Ave, Seattle, for a fixed price of $585 plus applicable taxes/permit fees. Includes travel within 20 miles and standard disposal.

Time & Materials Example

Labor: $165/hour (first hour billable in full, then 30-min increments).
Materials: Cost + 25% handling.
Trip Fee: $95 per on-site visit (elevator/crane/roof access billed if required; ferry/island or mountain mileage as listed in annex).

Deposits & Late Fees (Sample)

• Deposit: 30% on acceptance for projects over $3,000; balance due on completion.
• Late Fee: 1.5%/month (or the maximum allowed by law) on past-due balances over 15 days.

Maintenance Plan Addendum (Washington)

• Coverage: 2 tune-ups/year per covered system (spring cooling; fall heating) — optional mid-summer check for heavy-use sites and mid-winter heat-pump performance check in mountain regions.
• Tasks: Coil cleaning as needed; condensate freeze & overflow checks; electrical tighten; refrigerant check; boiler/burner safety checks where applicable; ERV/HRV filter & core inspection; rooftop safety protocols.
• Filters: Customer- or Contractor-supplied; sizes/intervals listed in annex; consider higher MERV/HEPA during wildfire smoke periods.
• Priority: Plan members get priority scheduling and 10% labor discount on non-covered repairs.
• Exclusions: Non-maintenance repairs, code corrections, concealed defects, abuse, wind/hail/flood/freeze/corrosion/smoke damage unless otherwise stated.
• Term: 12 months; auto-renews unless canceled 30 days prior.

Copy-Ready Clause Examples

L&I Registration & Regulated Trades

Contractor is registered with the Washington Department of Labor & Industries and holds/uses required trade licenses for regulated scopes (e.g., electrical administrator/journeyman, plumbing). Contractor’s legal name and Registration/License No. WA-MECH-{{your_number}} appear on this agreement and related communications.

Wind/Rain, Coastal Corrosion, Snow/Ice & Smoke

Where required by code, manufacturer, or site conditions, equipment will include rooftop anchorage/curb flashings with vibration isolation and wind/hail guards, corrosion-resistant hardware/coatings for coastal environments, condensate freeze protection for cold-exposed installations, and safe-work limits during windstorms, heavy rain, snow/ice, extreme heat, or poor-AQI/wildfire smoke events.

Change Orders

No change in scope, parts, or price is valid unless authorized by a written or electronic change order signed by both parties.

Cooling-Off (If Sold In-Home)

If this agreement was solicited and signed at Customer’s residence, Customer may have a three (3) business-day right to cancel. If applicable, a separate cancellation notice is attached explaining how to cancel and where to send notice.

Dispute Resolution & Venue

This agreement is governed by the laws of the State of Washington. Venue for any action lies in the county where the project is located, unless the parties agree otherwise in writing.

Washington HVAC Contract — FAQs