A Seattle heat pump permit is really a set of permits. Every split-system heat pump needs a refrigeration permit from the Seattle Department of Construction and Inspections (SDCI), which only a licensed refrigeration contractor can obtain. The circuit needs an electrical permit, and replacing or altering the furnace or air handler adds a furnace or mechanical permit. Cover and final inspections follow.
The Seattle Heat Pump Company plans and manages ducted heat pump projects in Seattle and King County, with the work carried out by licensed and insured contractors, including the Seattle refrigeration license the city requires. This guide lists each permit, what it costs, what the inspector checks, and how the rules change once you cross the city line.
Key takeaways
- Any split-system heat pump in Seattle needs a refrigeration permit, and only a licensed refrigeration contractor can obtain it.
- Seattle permits for a typical heat pump job run about $192 to $556 under SDCI's current fee schedule.
- Electrical permits come from the city in Seattle, Bellevue, Kirkland, Redmond, Renton, Burien and Mercer Island, and from Washington L&I in Shoreline and Lake Forest Park.
- A side-yard outdoor unit adds a noise review to the Seattle permit.
The three Seattle permits
A ducted heat pump touches three regulated systems: refrigerant piping, electrical wiring and the indoor heating equipment. Each has its own permit.
Refrigeration permit
SDCI requires a refrigeration permit for any split-system heat pump or air conditioner, because the outdoor and indoor units are connected by refrigerant lines installed on site. Only a contractor holding a Seattle refrigeration contractor license can obtain it, and the work is done by licensed refrigeration mechanics. The permit covers the line set, the connections, the pressure test and the charge, and it is where the city’s noise review happens when the outdoor unit goes in a side yard.
Electrical permit
The new circuit and disconnect for the outdoor unit, any circuit for an electric air handler, and any panel or service upgrade go on an electrical permit. A circuit-only permit is the small one. A service upgrade from 100 to 200 amps is the larger one. The electrical panel guide explains when that upgrade is needed.
Furnace or mechanical permit
When the indoor equipment changes, SDCI also requires a furnace or mechanical permit. That covers a new electric air handler replacing an oil or gas furnace, a new furnace in a dual fuel setup, or alterations to an existing furnace and its ducts. A homeowner may obtain the furnace permit, but in practice it is usually pulled by the same contractor managing the job, so one party is responsible for the inspection.
Seattle permit fees
These amounts come from SDCI’s current fee schedule. Each amount below includes the 5% technology fee.
| Permit | Current fee | When it applies |
|---|---|---|
| Refrigeration | $81.95 | Every split-system heat pump |
| Electrical, circuit | $110.38 | New heat pump circuit and disconnect |
| Electrical, with 200 amp service | $410.84 | Circuit plus a service upgrade |
| Mechanical, heat pump | $63.37 per unit | Indoor equipment installed or altered |
| Fire Department permit 6103 | $184 per tank | Oil tank decommissioning on an oil conversion |
A job with no indoor changes and a circuit-only electrical permit comes to about $192. One with a new air handler and a service upgrade comes to about $556. Fees are a small part of the total, but because the city sets them, they make a good check on a quote. If a bid lists a permit line far above these figures, ask what else is bundled into it. The installation cost guide puts the permits in the context of the whole budget.
What gets inspected
Seattle’s furnace and refrigeration permits carry two inspections. The cover inspection happens before anything is concealed, so the inspector can see refrigerant lines, duct connections and wiring that will later be behind walls, ceilings or insulation. The final inspection happens when the system is complete and running.
At final, the inspector looks at the installed equipment against the permit. One item Seattle’s energy code makes specific: heat pump controls must keep supplemental heat from running above 40°F, and the auxiliary heat lockout must be set to 35°F or lower at final inspection. That is a thermostat setting, and it is one reason commissioning matters. The backup heat settings guide covers it.
The energy code also requires equipment sized by ACCA Manual S from a Manual J load calculation. The sizing guide explains what that calculation contains.
The noise review
Seattle’s noise code limits sound at a residential property line to 55 dBA during the day and 45 dBA at night. SDCI applies that to heat pumps through a noise review for any equipment placed in a side yard. A predicted level of 47 dBA or less at the property line, using the unit’s heating sound rating, passes. Above that, the design needs a sound barrier, a compressor blanket or a different location. Front and rear yards generally avoid the review. The noise ordinance guide walks through the calculation and the options.
Plan a heat pump that clears permits the first timeThe assessment covers sizing, the panel and an outdoor location that meets Seattle's noise rules.
Get an EstimateWhy some contractors decline Seattle jobs
Homeowners in Seattle report a pattern that surprises them: smaller heating firms that work happily in the suburbs say they don’t take heat pump installs inside city limits, and the refrigeration license is the reason most often given. Others report only finding a handful of companies willing to bid a Seattle job.
The rule behind it is real. Seattle’s refrigeration licensing applies within the city, so a firm licensed and active in Shoreline or Bellevue cannot pull a Seattle refrigeration permit without it. That narrows the pool of bidders inside the city, which homeowners connect to longer waits and higher quotes, though there is no published data measuring that effect.
The practical takeaway is simple: ask every bidder who will pull the refrigeration permit, and under which license. A quote that leaves the permit vague, or suggests skipping it, is a reason to keep looking. The quote comparison guide includes this alongside the other lines worth checking.
Permits outside Seattle
Each suburb runs its own building department, and the requirements differ.
Bellevue requires a mechanical permit to install or replace a heat pump and an electrical permit for wiring or a service upgrade. Bellevue’s noise code uses the same 55 and 45 dBA limits as Seattle, enforced on complaint rather than at inspection. For new homes and additions over 1,000 square feet, the zoning code puts mechanical equipment in the rear yard at least 5 feet from the property line, and side-yard installations need sound screening. City permit data shows 2,584 Bellevue mechanical permits mentioning heat pumps over the latest three years of records. See heat pumps in Bellevue.
Electrical permits are issued by the city in Bellevue, Kirkland, Redmond, Renton, Burien and Mercer Island. In Shoreline and Lake Forest Park, Washington Labor & Industries issues and inspects electrical work. The Shoreline and Lake Forest Park page covers what else changes there, including City Light rates at the suburban level.
For mechanical permits and fees in other suburbs, the city’s own permit office is the authority. The contractor pulling the permits should know the local process for the address.
Related permits on conversions
Two other agencies come into some heat pump projects.
Oil tanks. In Seattle, a heating oil tank out of service for a year or more must be decommissioned by an ICC-certified decommissioner under Seattle Fire Department permit 6103, at $184 per tank. The permit is issued to the decommissioner, who must have it stamped “Approved to Proceed” before work starts and file a report within 30 days. See oil tank decommissioning.
Asbestos. The Puget Sound Clean Air Agency requires an asbestos survey before renovation, including on houses. Owner-occupants of single-family homes may do their own survey. Old duct wrap and furnace insulation in older houses are the usual places it comes up when a furnace is removed.
Who pulls what
On a typical Seattle ducted heat pump project, the refrigeration permit is pulled by the licensed refrigeration contractor, the electrical permit by the licensed electrical contractor, and the furnace or mechanical permit by the contractor replacing the indoor equipment. On an oil to heat pump conversion, the tank permit goes to the decommissioner. Seattle’s open data lists 19,466 single-family heat pump trade permits filed over the latest three years of records, so the process is routine; it just has more steps than many homeowners expect. Permits are part of every ducted heat pump installation The Seattle Heat Pump Company plans, and the installation process guide shows where each inspection falls.