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Get a Free QuoteBuilding a new home in NH? Installing solar during construction — or at minimum pre-wiring for it — saves $1,000-3,000 and avoids the damage and disruption of retrofitting a finished home. Here is exactly what to plan.
$1-3K
Retrofit Savings
25-40°
Ideal Roof Pitch
200A
Min Panel Service
$0.27/kWh
NH Electric Rate
The panels and inverters cost the same. The savings come from shared infrastructure — scaffolding, conduit, and permits that are cheaper to do once during construction than twice.
| Cost Item | Savings vs Retrofit | Why |
|---|---|---|
| Conduit in wall vs exterior strapping | $300-600 | Pre-run during framing vs drilling finished walls |
| Shared scaffolding with roofers | $400-800 | One scaffold setup instead of two separate |
| Attic access — no cutting through finished ceiling | $200-400 | Before drywall vs after |
| Combined building/solar permit | $200-400 | One submission vs two separate applications |
| No siding/exterior repair after conduit run | $150-300 | Pre-run avoids exterior penetrations |
| Total typical savings | $1,250-2,500 | Range: $1,000 minimal coordination to $3,000 full integration |
This is the one decision you cannot easily fix later. A north-facing roof pitch makes solar impractical. An east-west roof reduces production 15-25% compared to south-facing. The ridge direction of your NH home determines 25 years of solar production.
100%
Ridge runs east-west. South slope faces the sun. Target pitch: 30-38° for NH latitude (43-44°N).
75-85%
Ridge runs north-south. Can compensate with more panels (higher kW). About 15-25% production loss.
40-60%
Avoid placing the primary solar zone on a north-facing pitch. Ground-mount is a better solution for these homes.
Tell Your Builder Before Framing
The optimal NH solar roof has the main ridge running east-west, with the south-facing pitch having 400+ sq ft of unshaded area at 30-38 degrees. Trees, dormers, skylights, and HVAC equipment should be planned away from the south solar zone. Discuss this with your builder at the design phase — changes after framing can cost $5,000-15,000.
Share this checklist with your builder and electrician. These items are dramatically cheaper to include during construction than to add later.
The most impactful pre-construction solar decision (after roof orientation) is the conduit sleeve. This is a 2-inch PVC or EMT conduit run from the planned solar array location on the roof, down through the exterior wall or attic, and into the electrical panel room. It costs $150-400 to install during framing. After the home is drywalled, it costs $800-1,500 to retrofit.
The conduit is the pathway for the DC wiring from solar panels to the inverter, and the AC output wiring from the inverter to the main panel. In NH winters, exterior conduit is exposed to freeze-thaw cycling, which degrades conduit seals over time. Interior conduit through walls maintains consistent temperature and lasts far longer.
Both approaches are valid. Here is when each makes sense.
Best if you have design certainty and immediate need
Advantages
Drawbacks
Best if you want real usage data first
Advantages
Drawbacks
No federal tax credit: Section 25D (the 30% residential solar ITC) expired December 31, 2025. No state rebate: SB 303 repealed NH's state solar rebate in 2024. There is $0 in federal credits or state rebates for solar on new construction in NH in 2026.
~85% of retail
Credits roll month-to-month, locked through 2041. ~$2,000-2,400/yr for typical 8 kW NH system.
Automatic
New Hampshire has no state sales tax. Solar equipment and labor are exempt. Saves ~$2,000-2,400 on a $24,000 system vs. other states.
~$584/yr
RSA 72:62 — if your town adopted it (~66% of NH towns). Apply to your town assessor after installation.
Installing solar during construction typically saves $1,000-3,000 compared to a retrofit on the same home. The savings come from shared scaffolding ($400-800 savings), pre-run conduit in walls instead of exterior strapping ($300-600 savings), no attic access drilling ($200-400 savings), and coordinated permitting ($200-400 savings). The exact savings depend on the home design and how well the builder and solar installer coordinate.
NH follows the International Residential Code (IRC) with some state amendments. While NH has not adopted a specific solar-ready mandate (as California has), builders and solar installers commonly use the "solar ready" design standard: a 200A minimum service panel, a conduit sleeve from roof to electrical panel, and a dedicated 240V breaker space reserved for future solar. Some NH towns in the Lake Sunapee and Seacoast regions have informally adopted these as best practices for new construction.
Yes — for the electrical work, your builder's electrician can pull the conduit, install the solar-ready sub-panel, and set up the inverter. However, panel installation (racking and mounting) is often done by a specialized solar crew. Coordination is key: solar racking must go on before roofing shingles in the areas where panels will be installed, requiring builder-solar installer communication weeks before the roof is complete.
A 200A main panel is the standard recommendation for any new NH home that will have solar. If you are also planning an EV charger, heat pump, and electric range, some installers recommend a 400A service or a load management system (like an Enphase IQ8 with Encharge battery). A 200A panel can handle a typical 8-10 kW solar system plus a 7.2 kW Level 2 EV charger on a well-managed system.
Yes — ideally before framing begins. The most important decision is roof orientation. A south-facing roof pitch between 25-40 degrees is optimal for NH solar production. If your builder plans a north-south ridge (east-west facing roofs), renegotiate for a better orientation before walls go up. After framing, the structural decisions that affect solar (roof angle, ridge direction, HVAC placement on the roof) are essentially fixed.
Both are valid, but the economics favor installing panels during construction if you can. The conduit and electrical infrastructure has the same cost either way. Adding panels at construction saves the additional mobilization trip and scaffolding costs later. If you pre-wire and add panels after move-in, you will pay an extra $500-1,500 for the solar crew to return. However, waiting 1-2 years gives you real electricity usage data to size the system more accurately.
No. The residential solar Investment Tax Credit (Section 25D) expired December 31, 2025. It is $0 for homeowners purchasing solar with cash or a loan in 2026 — whether on new construction or existing homes. NH also has no state rebate (SB 303 repealed it in 2024). The available incentives are NEM 2.0 net metering (~85% of retail rate), no NH sales tax, and local property tax exemptions under RSA 72:62 if your town has adopted it.
Solar & Roof Replacement NH
What to do with an aging roof
Solar Home Value NH
4.1% premium on NH home sale price
Ground-Mount Solar NH
When the roof orientation is wrong
Solar + Heat Pump NH
Bundle for maximum electrification savings
NH Net Metering Guide
NEM 2.0 — ~85% of retail, locked to 2041
Cash vs Loan vs Lease
Solar financing for new NH homeowners
NuWatt works directly with NH builders to coordinate pre-wiring and panel installation. We will review your home plans and provide a pre-construction solar design at no cost.