What does soffit level mean on a house?
Short answer. Soffit level is the height, or elevation, of the underside of something: on a house, usually the bottom of the roof overhang, and on drawings, the underside of a beam, lintel or slab. Designers and builders use it to set window and door head heights, line up the roof of an addition with the existing house, and plan where porch roofs and gutters can tie in.
Where you see the term
- House plans and elevations: a note or dimension marking the height of the eave soffit above the finished floor or the ground.
- Structural drawings: the underside height of a beam or floor slab, which sets the headroom below it.
- Additions and porches: when a new roof has to meet an existing one, matching soffit levels keeps the eaves lined up and the gutters continuous.
Why it matters to homeowners
- Additions: a new room with a different ceiling height or roof pitch can end up with a soffit level that does not match the house, creating an awkward jog in the eave and a tricky roof tie-in where leaks like to start.
- Porch roofs: a porch roof attached below an existing eave needs enough height between the porch soffit and the house soffit to slope properly and drain.
- Windows: tall windows can run into the eave framing if the soffit level is low.
- Ladders and gutters: a high soffit level on a two story house means longer ladders, one reason gutter and soffit work costs more on taller homes.
Measuring it
On an existing house, measure from the ground or porch floor to the bottom of the soffit panel at the eave. On sloped lots, note where you measured, since the height changes along the wall. For how the overhang is built, see roof anatomy explained, and for how the roof itself is measured, how roofers measure a roof.