If your lot has any real elevation change down to the water, this is worth understanding before you fall in love with a building site.
I get this question most often from buyers looking at elevated lots along corridors like Dellwood Road, where bluff-line views are part of what makes the property valuable in the first place. The same elevation that creates the view is exactly what triggers a separate set of rules.
What actually counts as a bluff
Under Minnesota's shoreland rules, a bluff is a slope draining toward the water where the grade, measured from the toe of the slope to a point 25 feet above the ordinary high water level, averages 30 percent or steeper. The "top of the bluff" is defined even more specifically, it's the point where the slope transitions from steeper than 18 percent below the line to 18 percent or flatter above it, measured over a 25-foot horizontal distance.
That's a field determination, not something you eyeball from a listing photo. If a lot looks like it might qualify, it usually needs to be verified on site.
What the setback requires
Once a slope qualifies as a bluff, structures generally need to sit at least 30 feet back from the top of it. There's also a bluff impact zone, the bluff itself plus 20 feet beyond it, where structures, impervious surfaces, and most accessory facilities aren't allowed at all. Stairways and landings are typically the only exception, since there has to be some way to get down to the water.
Why this matters more on some lots than others
A flat, gradual lot on White Bear Lake or Bald Eagle Lake may never trigger this rule. A bluff lot along Dellwood Road or a similarly elevated stretch of shoreline almost certainly needs a bluff determination before anyone finalizes a building envelope. I've seen buyers assume a dramatic lot gives them more room to build, when the opposite is often true, the more dramatic the elevation, the more restricted the buildable area actually is.
What this means for you
If you're evaluating an elevated lot, ask for a bluff determination before you get attached to a specific footprint or view corridor. It's a straightforward step, but skipping it is how a buyer ends up redesigning a home around a line they didn't know existed.
I'd rather walk a bluff lot with you before you're under contract than after.
Blessings.
Tim Ornell Real Estate Advisor | Ornell Group Real Broker Luxury Division (NASDAQ: REAX) 651.263.9480 | ornellgroup.com Specializing in Twin Cities, MN waterfront properties and relocations.
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