Who owns the roof
Roof ownership is the whole question for a townhome or condo, and it is answered by your declaration and bylaws rather than by intuition.
In a fee-simple townhome you typically own the structure including the roof, and your position is close to a detached home. In a condominium-style arrangement the roof is frequently common element, owned collectively and maintained by the association, even when the unit below is yours.
Get the relevant clause in writing before spending money on a site assessment. Condos and shared roofs covers the variations.
What the HOA can and cannot do
Many states have solar access or solar rights laws that restrict an association’s ability to prohibit solar outright.
What those laws generally do not do is hand you the right to install on property you do not own. They limit unreasonable aesthetic restrictions on your own roof; they do not convert common element into private property.
So the sequence is: establish ownership, then check what your state’s solar access law says about the restrictions the association is applying. Solar access rights by state sets out where those laws exist.
The physical constraints of an attached home
Townhome roofs have a characteristic shape problem.
- Narrow planes. A deep, narrow roof gives you a long thin rectangle, and panel layouts waste more of it than on a square plane.
- Neighbouring shade. Attached and nearby units, often taller at one end of a row, cast shade your own property cannot fix.
- Shared walls and party structures. Conduit routing and attachment points must respect them.
- Roof penetrations near a shared boundary. Worth confirming in the governing documents as well as with the roofer.
Small systems cost more per watt
Permitting, the interconnection application, mobilising a crew and commissioning cost roughly the same whether the array is six panels or twenty-six.
Spread across fewer panels, those fixed costs raise the price per watt. A townhome system is not badly priced because someone is overcharging; it is smaller, and small systems carry their overhead less efficiently.
This is worth knowing before you compare your quote against a neighbour’s detached-home figure.
How the work runs
- Confirm roof ownershipFrom the declaration and bylaws, in writing. Nothing else matters until this is settled.
- Check the HOA processArchitectural review requirements, submission format and timeline.
- Check your state solar access lawWhat restrictions the association may and may not impose.
- Confirm the electrical serviceThat the panel serving your unit is yours alone.
- Assess the usable planeAccounting for the narrow shape and shade from neighbouring units.
- Design and submitOften to the HOA and the jurisdiction in parallel.
What moves the price
We do not publish a national average and present it as your price. These are the variables that separate two quotes for the same job — run your own numbers with the cost guides and calculators, and check what incentives you actually qualify for.
| Factor | Why it moves the number |
|---|---|
| System size | Smaller arrays carry fixed costs across fewer panels, raising cost per watt. |
| Roof geometry | Narrow planes waste layout space and can force a less efficient arrangement. |
| Shade mitigation | Neighbouring units often justify module-level electronics. |
| HOA requirements | Specified conduit routing, screening or particular finishes add cost. |
| Electrical access | Where the service panel sits relative to the roof can mean a long conduit run. |
What to ask before you commit
Take this list to the conversation. A professional who answers these directly is telling you a lot; one who deflects is telling you more.
- Do I own this roof, and which clause says so?
- What does the HOA architectural review require, and how long does it take?
- How much usable plane is there after the shade from next door?
- Is the service panel serving my unit exclusively mine?
- How does the cost per watt compare with a larger system, and why?
Common questions
Can I install solar on my townhome?
If you own the roof above your unit, usually yes, subject to HOA architectural review. If the roof is common element owned by the association, you generally cannot install unilaterally. Check the declaration and bylaws first.
Can my HOA stop me installing solar?
Many states have solar access laws limiting an association’s ability to prohibit solar on property you own, though what counts as a reasonable restriction varies. Those laws do not generally give you rights over common element roof.
Is solar worth it on a small townhome roof?
It can be, but expect a higher cost per watt. Permitting, interconnection and mobilisation cost much the same regardless of array size, so a small system spreads those fixed costs over fewer panels.
What about shade from the units next door?
It is one of the most common constraints on an attached home and it is not something you can fix on your own property. Insist on measured shade analysis rather than a visual judgement.