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ADU Independent Entrance: Where to Cut the Foundation

Where do you cut the foundation for an ADU entrance?

A basement or lower-level unit on a Skaneateles lakefront lot is only a legal rental if it has its own way in and out, and on these sloped lakefront parcels the entrance almost always means cutting the foundation wall. Investors treat the cut as a doorway. It is a structural event. Where you put the adu independent entrance, and how you transfer the load around the new opening, determines whether the unit passes inspection and whether the wall above it stays put for the next fifty years.
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Read the Slope Before You Pick the Wall

Lakefront lots fall toward the water, which is a gift for a walkout entrance: the downhill wall may already be half exposed. We pick the wall where grade is lowest so the new door reaches daylight with the least excavation and the cleanest drainage away from the opening. Putting the entrance on the uphill side means a window well stairwell that collects water, which is exactly the problem you do not want under a rental.

Cutting the Wall Without Weakening It

Concrete and block both carry load down to the footing, so an opening needs a lintel or a poured header sized to bridge the cut and a reinforced jamb on each side. We shore the wall above, saw the opening, set the header, then release the shoring. This is the same structural discipline behind any legal accessory dwelling unit: the permit reviewer wants to see the load path, not just the door. An attached in-law suite permit on a different property follows the same logic on a shared wall.

The mistake I see is someone saw-cutting a door in a foundation with no header and no shoring because the wall did not fall down that afternoon. It will crack above the opening within a year or two. You size the header for what is above it, every time.

– Elijah Mercer Boone, Lead Project Manager

Tie the Entrance Into the Permit Package

The entrance, the egress, and the unit count get reviewed together. We submit the structural detail with the rest of the Onondaga ADU permit application so the opening is approved as part of a legal unit, not flagged later as unpermitted structural work. On a basement conversion that distinction is what keeps the rental income clean.

Planning a Lakefront Lower-Level Unit?

SAP Construction has been building accessory dwelling units across Skaneateles and the Finger Lakes suburbs since 2016. Schedule a consultation and your project manager will assess the slope and the wall, then deliver a transparent estimate within 24 hours.

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FREQUENTLY ASKED QUESTIONS

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Our experts are here to help. Contact us directly for a consultation or any specific questions about your project.

On the lowest-grade wall, often a lakefront walkout side, so the door reaches daylight with clean drainage.
It is required for a legal ADU, along with egress and the rest of the permit package.
Not with a properly sized header and reinforced jambs carrying the load above.

STILL HAVE QUESTIONS?

Our experts are here to help. Contact us directly for a consultation or any specific questions about your project.

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