Plan for Solar While Designing a New Custom Home
A homeowner’s guide to coordinating solar, optional battery storage, electrical needs, and utility requirements during custom-home design.
Maor Greenberg
Solar is easiest to plan when it is considered alongside the design of a new custom home. Roof shape, shade, electrical loads, utility connection, and the household’s plans for heating, hot water, cooking, and vehicle charging all affect the choices. Early coordination helps the owner compare a solar proposal with the rest of the project scope, without assuming a fixed system size, utility-bill reduction, or payback.
Start with the home’s expected energy use
Before choosing solar equipment, review the home’s expected electric loads with the design team. Heating and cooling, water heating, cooking, laundry, lighting, and possible electric-vehicle charging all shape the project’s energy needs. The equipment selected for the home and how residents use it matter as much as the roof when evaluating a system.
Ask the architect, energy consultant, and electrical contractor to coordinate the service and panel, major equipment, wiring routes, and space for future changes. If battery storage or vehicle charging is a possibility, raise it during design so the team can assess electrical capacity and locations before plans are finalized.
Design the roof with solar in mind
Usable roof area, orientation, shading, roof form, and nearby trees or buildings affect solar feasibility. Discuss likely panel locations while the roof is being designed, and coordinate them with skylights, vents, plumbing penetrations, mechanical equipment, and access needs. A solar professional can assess the specific site and explain the assumptions behind a production estimate.
For a California home, the applicable building-energy requirements depend on the project and permit timing. The California Energy Commission says permit applications made on or after January 1, 2026 must comply with the 2025 Energy Code. Solar photovoltaic systems are generally required for newly constructed homes, subject to code exceptions; a new single-family home without battery storage must generally include battery-ready infrastructure. Ask the project’s design and energy professionals to confirm the requirements and exceptions for the specific home. See the Commission’s 2025 Energy Code and solar and battery guidance.
Understand what a solar estimate assumes
Ask each provider to show the proposed system size, estimated annual production, shade and equipment assumptions, and any assumed utility rate plan. Clarify whether the estimate includes design, permits, electrical work, utility interconnection, and changes to the roof or service. Compare proposals using the same scope and assumptions.
Solar production and utility-bill effects are different measures. In California, exported electricity is credited under the customer’s applicable tariff, and its value can differ from the price of electricity purchased from the grid. Review the utility rules that apply to the property and meter before using export credits in a financial estimate. The California Public Utilities Commission summarizes net billing and net energy metering.
Choose whether storage fits the household’s goals
A battery may be considered for storing energy for later use or supporting selected circuits during an outage, depending on system design. Decide what the household wants it to do before comparing products. Ask the installer to identify the circuits supported, equipment needed, operating limits, and how the system behaves during an outage.
Battery equipment also needs a suitable location and coordination with electrical plans, permitting, inspections, and utility requirements. Have the project team confirm the requirements that apply to the site and proposed equipment. A battery should be evaluated against the homeowner’s intended use and project budget rather than assumed to provide whole-home backup or a particular bill result.
Keep the financial comparison specific
Request an estimate that separates solar and optional storage from home construction, service upgrades, permits, and utility work. For any bill analysis, ask for the assumed household use, rates, solar production, exported energy, and battery operating plan. Actual costs and results vary with the site, design, equipment, utility rules, and household use; a production estimate by itself does not establish savings or payback.
Check current incentives and tax rules directly with the relevant program administrator or a qualified tax professional before including them in the budget. Eligibility, funding, and deadlines can depend on the property, equipment, applicant, and project timing. Do not treat an advertised incentive or tax benefit as a guaranteed project credit.
Coordinate the decisions before construction
Bring the architect, energy consultant, electrician, solar provider, and builder into the conversation early enough to coordinate the roof, electrical design, equipment locations, utility connection, and project schedule. Ask who is responsible for permits and interconnection, what is included in each proposal, and which decisions need to be made before construction begins. That gives the homeowner a clearer basis for comparing options as the custom-home plans develop. Learn how Greenberg approaches custom home construction, or discuss your plans with our team.