# Extreme Loft Conversion

## Step 4: Planning: Calculating Costs

To work out a rough cost of the project ad how much material was required, I calculated the cost for a given area- Floor, walls and Ceiling.

Flooring pack number formula = (Length m x Width m)  ÷ A
where A = area a pack of chipboard flooring covers.

Floor Cost formula = (Length m x Width m)  ÷ A x P
where A = area a pack of chipboard flooring covers and P = the cost of the pack.

For example ((2.5m x 5m) ÷ 1.2m) x £6 = £62.50  (for  12.5m²) 10.416 packs*

Plasterboard number of sheets formula = (Height of wall m x Width of wall m) ÷ (length of plasterboard sheet x Width of plasterboard sheet)

Plasterboard wall cost formula = (Height of wall m x Width of wall m) ÷ (length of plasterboard sheet x Width of plasterboard sheet)  x C
where C is the cost for the sheet of plasterboard

For example (2.4m x 3m) ÷ (2.4m x 1.2m) = 2.5 sheets of plasterboard* Cost = £17.50

*Ensure you round up and not down for the number of packs of flooring or sheets of plasterboard and always be sure to buy an extra sheet of plasterboard as the off cuts can sometimes end up too small to use and these are part of the area of plasterboard you have calculated.

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