Category: Design
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
A level is the vertical height of a point in the building measured from a fixed datum, such as zero at the finished ground floor or street level.
Why it matters on a project
A small level error causes drainage problems, uneven stair risers and steps between tiles and thresholds.
Measurement and pricing
Written in metres with a plus or minus sign, for example +3.20 or -1.50.
Worked example
If the ground floor finished level is ±0.00 and screed plus tile is 8 cm, the structural slab top is at -0.08.
Common mistake
Confusing the structural concrete level with the finished floor level; the difference is the tile and screed thickness.
Frequently asked questions
What is the difference between FFL and SSL?
FFL is the finished floor level and SSL the structural slab level; the difference is the thickness of the finishes.
Where is level zero taken from?
The designer sets it, usually the ground floor finish, tied to street level or a surveyed benchmark.
Related terms
- SectionA drawing showing the building as if cut vertically to reveal floors, heights and internal details.
- Elevation (facade)A drawing of the building’s external face showing openings, materials and heights.
- Construction drawingsDetailed drawings used to build the work on site after design approval, including dimensions, levels and details.
- Footings (foundations)Structural elements that transfer the building loads to the soil.
Does your project need architectural design and construction drawings? Send the drawings or a short description and we reply within one working day.
Service detailsRequest a quote