A buyer stands in the detached garage behind a shingled Cape on a quiet side street off Route 77, tape measure in hand, already converting square footage into projected nightly rates. It is a reasonable instinct. Across coastal Maine, an accessory dwelling unit has become shorthand for built-in rental income, a way to offset a seven-figure mortgage with a listing on a booking platform. In Cape Elizabeth, that math does not hold. The town's own zoning file tells a different story, and it is worth reading before you write an offer that assumes otherwise.
The Size Got Bigger. The Purpose Got Narrower.
In late 2023, the Cape Elizabeth Town Council passed a set of zoning amendments in response to LD 2003, the state housing law aimed at reducing barriers to new housing statewide. The council did more than the minimum. Effective January 10, 2024, the town cut the minimum size for an accessory dwelling unit from 300 square feet to 190. Then, effective July 10, 2024, it raised the maximum allowable size to 1,100 square feet, a jump from the 600-square-foot cap the Ordinance Committee had originally floated.
Councilor Gretchen Noonan explained the shift at the time by pointing to residents who had been sitting on ADU plans, waiting to see if the town would eventually allow something bigger than 600 square feet. The council decided it would, over some public pushback about scope creep beyond what the state required.
Read alone, that looks like a straightforward win for anyone hoping to add rentable square footage to a Cape Elizabeth property. But the same amendment package that raised the size cap also closed a specific door: as of that same July 10, 2024 effective date, an ADU in Cape Elizabeth cannot be used as a short-term rental, full stop. Not with a bigger unit, not with a larger lot, not with a special permit.
| What Changed | Before | Effective 2024 |
|---|---|---|
| Minimum ADU size | 300 sq ft | 190 sq ft |
| Maximum ADU size | 600 sq ft (proposed cap) | 1,100 sq ft |
| ADU used as short-term rental | Not the town's practice | Prohibited |
That is the detail a rental-income spreadsheet misses. The town made it easier to build a bigger accessory unit and, in the same breath, made sure that unit could not become a booking-platform listing.
Why the Same Council Closed the Door Twice
This is not an isolated quirk buried in one amendment. It is the second time in three years that Cape Elizabeth has drawn a hard line between housing for occupants and housing for income.
Back in 2021, the town tightened its short-term rental ordinance for primary residences. The rule that drew the most attention required most rental types to be tied to an owner who actually lives on the property. As Council Chair James Garvin put it at the time, the goal was to make sure "that primary resident has to, at some point, face their neighbors." Under that ordinance, a Primary Residence Unhosted rental, meaning the owner is not present during the stay, is capped at 42 days a year. The only real exception is for parcels of seven acres or more, which can rent up to 182 days annually whether hosted or not, a provision that mostly applies to a small number of larger, more rural lots rather than the in-town streets where most buyers are shopping.
Set those two ordinances side by side and the pattern is consistent. The council has twice chosen to expand what residents can build or add to their property while restricting what they can turn into a standalone rental business. An ADU gives a homeowner more room for a parent, an adult child, or a long-term tenant. It does not give them a second listing on a booking app.
Read the Fine Print on Price Headlines the Same Way
The same discipline applies to the price data circulating on Cape Elizabeth right now, because the headline numbers do not agree with each other, and the disagreement is instructive rather than alarming.
One widely cited figure from July 2026 puts the median list price for Cape Elizabeth homes at roughly $1.13 million, with homes sitting on the market a median of 46 days. A separate dataset, drawn from actual closed sales in January 2026, put the median sold price closer to $843,000, with homes selling in about 30 days, up from 19 days the year before, and notably fewer transactions that month than the January prior.
Those numbers are not contradicting each other. They are measuring different things. One is a snapshot of what sellers are currently asking. The other reflects what buyers actually paid, months earlier, in a thinner winter market with fewer closed deals to average across. Treat either figure as the single truth about "the Cape Elizabeth market" and you will misjudge what a specific house is worth. Ask whether a number describes an ask or a close, and in which month, before you let it anchor an offer.
What This Means If You're Weighing a Fixer or an Expansion
If you are touring a property in Cape Elizabeth with an eye toward adding or converting an accessory unit, a few things are worth confirming before that potential factors into your offer price.
- An ADU can now run as large as 1,100 square feet, provided it stays smaller than the primary dwelling and meets the setback rules tied to its location on the lot. Budget for that as guest space, in-law housing, or a long-term lease, not nightly rental income.
- The seven-acre-plus allowance that lets some primary residences rent up to 182 days a year applies to the primary residence only. It does not extend to an ADU on the same parcel, regardless of lot size.
- If short-term rental income is part of your financial plan for a property, that income has to come from the main house, and only if the parcel and ownership structure meet the town's homestead exemption and occupancy requirements. The town's short-term rental ordinance standards spell out permit types, fees, and the annual registration process in detail.
- Any new or replacement septic system tied to an ADU or expansion still needs sign-off from the town's Code Enforcement Office, a separate process from the zoning approval itself.
- If you are comparing Cape Elizabeth against a neighboring town for ADU flexibility, ask each code office the same two questions: what is the maximum square footage allowed, and can the unit be rented short-term. The answer to the second question changes the entire financial picture, and it is not the same answer in every town along this stretch of coast.
A Few Questions Worth Asking Before You Write an Offer
Can I get a special exception to rent my Cape Elizabeth ADU short-term? No. The prohibition, effective July 10, 2024, applies regardless of lot size or permit type. The seven-acre exception in the town's separate rental ordinance covers primary residences only.
Does a bigger ADU cap mean I can build something the size of a small house? Not quite. The 1,100-square-foot ceiling is real, but the unit must remain smaller than the primary dwelling on the lot, and setback requirements depend on whether it is attached to the main house or built as a detached structure.
If I already have an ADU that predates these rules, does anything change for me? Confirm with the Code Enforcement Office whether your unit was permitted under the current ordinance or an earlier version, since the effective dates matter for what is grandfathered and what is not.
Cape Elizabeth's zoning file is not trying to trip anyone up. It is telling you, plainly, what kind of housing the town wants to see more of, and what kind it does not. Reading that file before you make an offer is the difference between valuing a garage apartment for what it actually is and valuing it for what a spreadsheet assumed it would be.
If you are weighing a property here with renovation or expansion in mind, Alexa & Reed Oestreicher can walk the specifics with you, from what a given lot's zoning district actually allows to how that potential should factor into your offer. Reach out when you are ready to look closer.
