Learn how to calculate the square meterage for your bathroom, kitchen, or floor tiling project in South East London – with expert tips from local fitters in Bromley, Lewisham, Greenwich & Dulwich.
Why measuring tile area matters
When planning your bathroom or kitchen renovation, knowing your exact square meterage is essential. It ensures you order the right number of tiles, avoid costly waste, and keep your South East London project on budget.
Whether you’re tiling a wet room in Bromley, a kitchen splashback in Greenwich, or a bathroom floor in Lewisham etc, accurate measurement is key to a smooth installation.
Step 1: Measure the length & width
Use a tape measure or laser measurer to find the length and width of each wall or floor area you plan to tile.
For example:
- Wall width = 2.4m
- Wall height = 2.2m
Multiply them together:
2.4m x 2.2m = 5.28m²
That’s the total area for that wall.
Tip: If your wall or floor has awkward shapes, split it into smaller rectangles, measure each one, then add them together.
Step 2: Subtract openings or gaps
If there are windows, doors, or niches, subtract those areas:
Example:
- Door: 0.8m x 2m = 1.6m²
- Window: 1m x 1m = 1m²
So from your 5.28m² wall area:
5.28m² – (1.6 + 1) = 2.68m² of tiling
This avoids over-ordering and keeps your project cost-effective.
➕ Step 3: Add 10% for cuts & wastage
Tiles need trimming to fit edges, corners, and uneven walls — so always add a little extra.
✅ Add 10% for straight walls and square rooms
✅ Add 15% for diagonal layouts or patterned designs
Example:
If your total area is 20m², order:
20m² + 10% = 22m² of tiles
In South East London homes, older walls are often slightly uneven, so that extra allowance ensures you don’t run short.
Step 4: Converting to boxes
Tile boxes list how many square metres they cover.
For example, if a box covers 1.44m² and your total area is 22m²:
22 ÷ 1.44 = 15.27 boxes → Always round up to 16 boxes.
Example: Bathroom floor in Bromley
Let’s say your bathroom floor measures 2.6m x 2.8m:
2.6 x 2.8 = 7.28m²
Add 10% waste:
7.28 + 0.73 = 8.01m² total
If each box covers 1.33m², you’ll need 7 boxes of tiles.
️ Step 5: Don’t forget adhesive & grout
As a general rule:
- Adhesive: 1 bag per 4-5m² (depending on tile size & trowel)
- Grout: 1 bag per 8–+-10m²
Your installer will adjust this depending on your tile thickness and joint spacing.
Local advice for South East London homes
Homes in Greenwich, Lewisham and Bromley and across London generally often have older subfloors, which may not be perfectly level.
A professional installer can:
- Correct surface irregularities
- Recommend tile layouts to reduce waste
- Help you calculate exact material quantities
Hiring a local tiler ensures accurate measurement and a perfect finish for your renovation project.
Quick Summary
| Step | Task | Example |
| 1️⃣ | Measure length x width | 2.4m x 2.2m = 5.28m² |
| 2️⃣ | Subtract openings | 5.28 – 2.6 = 2.68m² |
| 3️⃣ | Add 10-15% waste | 2.68 + 10% = 2.95m² |
| 4️⃣ | Convert to boxes | 2.95 ÷ 1.44 = 3 boxes |
| 5️⃣ | Allow for adhesive & grout | 1 bag per 4-5m² |
Final thought….
Working out your square meterage correctly saves time, money, and hassle — ensuring your South East London tiling project runs smoothly from the start.
Need help planning your tiling project?
Our team provides professional tiling, waterproofing, and bathroom installations throughout Bromley, Greenwich, Lewisham, Dulwich, and Chislehurst.
We’ll measure, supply, and install your tiles with precision and care, so your renovation looks perfect down to the last millimetre.