Does it look familiar?
Supply and Lay homogeneous / ceramic tiles on ______
How to calculate psf (per square ft)?
Normally, the floor-plan given is in mm. What you need to do is to first convert mm to metre.
E.g. Living hall is 4000 mm x 3500 mm.
2 method of calculation psf :
- 1st. By using square metre
4 m x 3.5 m = 14 square metre
14 square metre x 10.764 = 150.696 spf
- 2nd. By using 1 ft (convert ft to mm)
(4 /0.3) x (3.5 / 0.3) = 155.555 spf
Normally, Reno IDs/Contractor will use
1 square metres = 10.764 square ft
1 ft = 0.3 metre (for easier calculation)
It seem like 2nd method calculate more tiles but normally Reno IDs/Contractor will not calculate exact amount as they need to add in about 15%-20% more psf for wall skirting and also to play safe in-case of tiles damage or shortage. (depending on your area)
How can I know how much the Reno IDs/Contractor charge per square ft?
E.g, Supply and Lay Homogeneous for Living Hall - $950.00
Based on my living hall is 4000 mm x 3500 mm. My PSF is 150.696 spf.
$950.00 / 150.696 = $6.31 (round off).
Selecting the floor tiles which cost only $3.30 can become $6.31. How can that be possible? This is not the actual psf that will be order, as need to add 15%-20% for allowance on skirting and one or a few bad tiles replacement. Some Reno IDs/Contractor might just add 10%. All this is based on how they calculate and give left allowance for a few bad tiles and wall skirting.
In other way, the calculation can be :
$950.00 / (150.696 + 20% of $150.696) = $5.26 (round off).
How does Reno IDs/Contractor actually work out a calculation based on psf?
This calculation really depends on the Reno IDs film /Contractor film want to earn how much on your tiling works. No offense for any mistake as I stated this is just a rough estimation. Normally they will bring you to their so-call favourite shop to select the tiles, whether may it be Homogeneous Tiles or Ceramic Tiles.
E.g. Living Hall homogeneous tiles cost about $3.30
In most cases, they will charge at psf rate :
- $1.50 (Labour Charges) + $1.00 (cement and sand) + $3.30 = $5.80
- $1.50 (Labour Charges) + $1.50 (cement and sand) + $0.50 (profit) + $3.30 = $6.80
Normally cement is less $10 per pack, assuming they already earn certain percentage. Not only that, they also get discount from their so-call favourite or regular tiles shop (suppliers). Which can be up to 10-20%. Some suppliers can give the Reno IDs/Contractor to about $0.50 - $1.00 psf rebated. As for sand is sometimes include inside the quotation and include inside part of the removal or hacking.
How do I calculate or know how many pieces of tiles they order?
Let take example on the Living Hall which is currently 4000 mm x 3500 mm and is 600mm x 600 mm Homogeneous Tiles.
(convert to square metre) 0.6 mm x 0.6 m = 0.36 square metre
(convert to psf) 0.36 * 10.764 = 3.87504 psf
Since the current living hall is 150.696 psf .
2 method of how they calculate the tiles (for my style, I add 20% to play safe)
1st: Add additional 20% psf to the living hall
150.696 psf + (20% of 150.696 psf) / 3.875 psf = 47 pcs (round off)
2nd: Add additional 20% to the tiles for the living hall
150.696 psf / 3.875 psf = 39 pcs + (20% of 39 pcs) = 47 pcs (round off)
Than how to calculate wall tiles for kitchen, bathrooms?
Standard ceiling height can be range from 2.35 m (new build), 2.5 m or 2.6 m. Usual practice is to find out the four corners length.
E.g. my kitchen is about 3000 mm x 4000 mm. In regardless of the length even the kitchen can be have a Z-shape. Even the Z-shaped plus together is still one length.
In this case, I measure my ceiling height is 2.5m
3 m x 2.5 m x 10.764 ft = 80.73 sq ft <-- for 1st side (same for opposite side)
4 m x 2.5 m x 10.764 ft = 107.64 sq ft <-- for 2nd side (same for opposite side)
Total Square ft (sum of 4 sides), 80.73 + 107.64 + 80.73 + 107.64 = 376.74 sq ft
Check whether is there any door entrance or passage way, measure the length and minus off from Total Square Ft from the 4 sides.
Actual calculation = 4 sides (total sq ft) - door entrance / passage way (sq ft)
Remember: Kitchen got 4 side that why kitchen wall tiles and bathroom wall tiles cost a lot. Normally, additional of 10%-15% of total sq ft is added and also depending whether is there any door entrance to the dinning area or living hall.
