## Calculating the Total Floor Area

While I was working on a project for a client; creating alternate options and studying which option would work best. It occurred to me that the only reason why this is important is because essentially any client would want to make money leasing flats. The only way to do that is to increase the percentage of the part that’s saleable and reduce as much as possible the amount he has to spend constructing the building.

That’s why it’s important to know how to calculate both the Saleable Area and the Construction Area.
Now this may seem pretty straight forward at start. But there are a lot of calculations that you’re going to need to sum up to get those two variables.

The “Saleable Area” is how much of the total area of the project is saleable. The total area in this case, is the Total Construction Area. (You can find more about the construction area in my previous blog here). In the Saleable Area the thickness of the wall and the area within the walls are included. If we have two flats that are adjacent to each other and share the same wall, the thickness of the wall is split between the two flats. And so the center line of the wall will mark the edge of the saleable area for each flat.

Let’s go back to the previous example we used in the previous blog.
We assumed a 4 Storey Flat located on a plot of 810 sq.m. We found the Total Construction Area, which is = 1286 sq.m
Recall the building consists of a Ground Floor, three Typical Floors and a Roof Floor.
The Roof and Ground Floor are excluded from the calculations here because the spaces are not considered saleable.

As seen in the plan, the area of each flat (including the thickness of the walls) is 139 sq.m. The central core is 34 sq.m, and that too will not be included in the total saleable area. So as to say;
The Total Saleable Area in each floor is = 139 sq.m x 2
=  278 sq.m

Total Saleable Area = 278 sq.m x (no. of typical floors)
= 278 sq.m x 3 = 834 sq.m