Quick answer: Yes, mounting solar panels on exterior walls instead of a roof is generally legal in New Hampshire, but it isn't a shortcut around the rules. A wall-mounted array still needs a building permit, an electrical permit, and — outside of narrow homeowner exemptions — a licensed electrician for the wiring, the same as a rooftop system. A photo of one such install recently went viral on Reddit, and the debate it sparked says a lot about the trade-offs of do-it-yourself solar.
What happened with the New Hampshire photo
A Reddit user posted a photo showing solar panels installed vertically along the exterior wall of a home, rather than on the roof. The image spread quickly, and commenters guessed the house was in a rural part of New Hampshire, likely placed that way to skip the cost and complexity of a roof-mounted system.
The reaction split into two camps. Some commenters loved the improvised look, with one describing it as "solar punk" — a nod to using solar tech wherever it fits, aesthetics aside. Others focused on the practical side: permitting, snow performance, and how much power a wall-facing panel can realistically produce compared with a properly tilted roof array.
Why people choose walls over roofs
Rooftop solar isn't cheap to install correctly. Roof work typically requires fall protection, scaffolding or harnesses, and often a structural review to confirm the roof can bear the added weight. Wall-mounted panels avoid most of that: installers can work from ladders instead of the roof itself, and there's no need to penetrate roofing material with mounting hardware.
For homeowners trying to cut costs or do part of the work themselves, that difference matters. It doesn't mean wall mounting is automatically easier from a code standpoint, though — it just moves the challenge from structural to electrical and aesthetic.
| Factor | Roof-Mounted Panels | Wall-Mounted Panels |
|---|---|---|
| Typical sun exposure | Higher, if angled south and unshaded | Lower overall, but can catch low winter sun well |
| Snow performance | Can be buried or shaded by snow buildup | Vertical surface sheds snow more easily |
| Installation labor | Often needs fall protection, roof penetrations | Ladder-based work, no roof penetration |
| Structural review | Frequently required for older roofs | Depends on wall construction and mounting method |
| Curb appeal | Less visually disruptive in most cases | More visible; may draw neighbor or HOA scrutiny |
Is it actually legal? What New Hampshire code requires
New Hampshire enforces a single statewide building code under RSA 155-A, which every town and city must follow, though individual municipalities can add local permitting steps. For a solar installation — wall-mounted or roof-mounted — that generally means:
- A building permit, since the mounting hardware and any structural attachment fall under the state building code.
- An electrical permit, since the panels, inverter, wiring, and connection to the home's electrical panel fall under the National Electrical Code (NEC), which New Hampshire adopts as part of its state code.
- A land-use or historic district review, in towns where the property sits inside a designated historic district and the visible change to the building's exterior needs sign-off.
- Compliance with New Hampshire Fire Marshal guidance for photovoltaic systems on one- and two-family homes, which covers signage, disconnects, and access for firefighters.
The key point: New Hampshire does allow homeowners to do their own electrical work under RSA 319-C:15, but only in a single-family home they own and occupy themselves. Bring in any outside help, and that helper needs to be a licensed electrician. Most towns also want a licensed electrician present for the panel-to-inverter and inverter-to-home wiring specifically, even on an otherwise DIY project.
Does wall-mounted solar actually work as well?
Output depends on orientation, tilt, and shading more than mounting location alone. A wall facing due south will still catch meaningfully less sun over a full year than a properly angled roof array, since walls are vertical rather than tilted toward the sun's typical arc.
Where wall mounting has a real edge is winter performance in snowy climates. A vertical panel is naturally better at shedding snow, and it also captures more of the sun's low winter angle than a shallow-pitched roof array might. That's part of why several Reddit commenters pointed out that wall panels "keep working when it snows," even if their peak summer output is lower than a well-placed roof system.
Steps to install solar the right way in New Hampshire
- Check your town's specific permit process. Requirements are set at the state level but administered locally, so forms and fees vary by municipality.
- Confirm whether your property sits in a historic district. Visible wall-mounted panels are more likely to trigger this review than a roof array that's out of street view.
- Line up a licensed electrician for the wiring, inverter connection, and utility interconnection, even if you plan to handle the mounting hardware yourself.
- Get a structural assessment of the mounting surface — wall or roof — to confirm it can support the panels and hardware in wind and snow load conditions.
- Schedule inspections with your local building and fire departments before the system goes live.
Frequently Asked Questions
Is it legal to mount solar panels on a house's exterior wall instead of the roof?
Generally yes, as long as the installation still meets the same building, electrical, and fire code requirements that apply to any solar system in New Hampshire.
Do I need a permit for a DIY solar installation?
Almost always. Most New Hampshire towns require both a building permit and an electrical permit before any solar work begins, regardless of who's doing the installation.
Can I wire my own solar panels in New Hampshire?
Only if you own and personally occupy the single-family home and you're doing the work yourself, under the homeowner exemption in RSA 319-C:15. Anyone else doing electrical work on the system needs to be a licensed electrician.
Do wall-mounted panels produce less electricity than roof panels?
Usually, yes, over a full year, since walls are vertical rather than angled toward the sun. They can perform relatively well in winter, though, because they shed snow and catch low-angle sunlight more effectively than a snow-covered roof array.
The bottom line
The viral photo captured something real: solar hardware doesn't have to live on a roof to be useful, and plenty of homeowners are looking for ways around the cost and hassle of a traditional install. But "creative" and "code-compliant" aren't the same thing. Anyone considering a wall-mounted setup in New Hampshire should treat it like any other solar project — permits, a licensed electrician for the wiring, and a check on whether local historic district rules apply — before panels go up.
If you're weighing a similar project, start by calling your town's building department before buying equipment. It's a faster way to find out what's allowed than guessing from a Reddit thread.