Solar, batteries, EV charging and electric heating compete for roof area, panel space, service capacity and project timing. Redmond's residential process may involve separate electrical, mechanical and building applications, while Washington requires licensed electrical contractors and certified electricians. Start with energy use, roof and shade, existing service and future loads. A complete proposal assigns permits, inspections, utility steps, commissioning and warranty responsibility.
Review bills and future loads, inspect roof life and shade, calculate service and panel capacity, define outage priorities, and confirm Redmond permits plus utility interconnection. Require a one-line diagram, equipment list, production assumptions, responsibility chart and closeout package.
Collect a full year of use when available and add planned EV, heat-pump, water-heating or cooking loads. The solar model should state usable roof, shade, orientation, equipment and system losses. A promise to erase a bill is not a design. Keep assumptions visible so competing proposals can be normalized.
Main-breaker size alone does not decide whether new loads fit. A licensed electrical contractor should assess service, panel condition, spaces, feeders and load diversity. The evidence may support circuit work, load management, a subpanel or service change. Ask for the calculation and one-line diagram behind the recommendation.
If roof remaining life is uncertain, assess it before final array layout. Define attachment, flashing, leak-response and future removal responsibility. Preserve vents and service access. A lower solar bid can create higher lifecycle cost if the system must be removed for a foreseeable reroof.
List critical loads, starting demand and expected duration under stated conditions. The bid should cover usable capacity, operating reserve, location, disconnects, communications, warranty and behavior without internet. A capacity headline does not tell a homeowner what works during an outage.
Estimate daily miles and overnight parking time. A lower charging rate or managed load may meet the need without major service work. Record circuit route, outdoor exposure, charger ownership and future vehicle plans. Verify current utility rates directly rather than designing around a temporary incentive.
Redmond's residential guidance lists building, electrical, mechanical and plumbing applications as separate submittals that may apply to a project. The contract should name applicant, correction responder and inspection coordinator. Utility interconnection and city approval are different steps; physical installation alone does not authorize generation.
Washington L&I advises homeowners to use licensed electrical contractors and verify the certified electricians performing the work. Match the legal business and license information to the proposal. If one company sells and another installs, record design, permit, roof and warranty roles separately.
Closeout should provide approved drawings, final permit and utility status, serial records, monitoring credentials, warranties, shutdown instructions and labeled disconnects. Test production and battery modes with the owner. Preserve the one-line diagram for future service and additions.
A household may install solar now, add an EV later and replace heating equipment at the end of its service life. Ask the designer to show spare spaces, conduit routes, load-management options and equipment locations that preserve realistic next steps. Distinguish work worth installing today from provisions that only need documentation. A phased plan avoids unsupported oversizing while reducing the risk that a later contractor must replace a new panel, move an array component or reopen finished surfaces to reach a load the homeowner already anticipated.
Describe the project once and we match it with vetted local pros who actually do this work — you choose who to hire, or nobody at all.
The city lists electrical, mechanical, plumbing and building applications that may be required by scope.
Redmond states that inspections occur throughout construction and final inspection is required to complete the process.
Washington L&I provides verification for electrical contractors and the certified electricians performing regulated work.
| Upgrade | Evidence | Decision output |
|---|---|---|
| Solar | Bills, roof plan and shade | Production model and layout |
| Battery | Critical circuits and outage goal | Usable capacity and load schedule |
| Panel work | Condition and load calculation | Repair, management, subpanel or service decision |
| EV charging | Daily miles and parking time | Circuit, route and charging plan |
| Electrification | Future equipment | Phased one-line and capacity roadmap |
Compare array, inverter, attachments, battery, panel or service work, EV equipment, trenching, permits, interconnection, monitoring and warranties as separate lines. Require load and production assumptions. Verify incentives with the current program administrator and never treat them as guaranteed savings.
No. Existing equipment, planned loads and design determine the answer. Require an assessment and calculation.
Depending on scope, separate building, electrical and mechanical applications may be involved. Confirm them for the address.
If roof life is materially shorter than array life, coordinating reroofing first may avoid later removal.
Bills, usable roof, shade, orientation, equipment and modeled losses.
Usable capacity, backed-up circuits, duration assumptions, modes, location and warranty.
Use Washington L&I to verify the business license and the electricians' certifications.
After required inspection and utility authorization steps are complete.
Approved drawings, final statuses, serials, monitoring access, warranties and shutdown instructions.
Describe the roof, bills, panel, vehicles and future appliances. We can connect you with contractors who assess the whole system.
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