What you need to know
- Calculate the perimeter and subtract door openings where no skirting will be fitted.
- Add waste for mitres, corners and unusable offcuts.
- Round up to complete lengths.
Use your own measurements
Use the linked BricoDato resource to check these inputs in your own situation. Skirting is sold by piece length, but a room has corners, doorways and joins.
Start with the perimeter
For a rectangle, perimeter is 2 × (length + width). For irregular rooms, measure each wall section separately.
Subtract only real gaps
Doorways normally remove a length of skirting, but built-in furniture or radiators do not always do so. Measure the actual installation line.
Corners create waste
Mitred corners and joint positions mean an offcut of the correct length may still be unusable. Allow more waste in rooms with many corners.
Remember accessories
Adhesive, clips, corner pieces, end caps and transition profiles can add cost and should be planned separately.
How many skirting lengths for a room?
Skirting is sold by piece length, but a room has corners, doorways and joins. Start with the measured wall perimeter and then test how cuts can be arranged on the stock lengths.
Example to adapt
A 4 m × 3 m room has 14 m of perimeter. If one 0.9 m-wide door opening needs no skirting, the nominal length is 13.1 m. With a 10% allowance it becomes 14.41 m. At 2.4 m per length, 14.41 ÷ 2.4 = 6.00+ and must be rounded up to 7 full lengths.
| Extra cutting allowance | Length to purchase | 2.4 m pieces |
|---|---|---|
| 0% | 13.10 m | 6 |
| 5% | 13.76 m | 6 |
| 10% | 14.41 m | 7 |
Checks before acting
- Measure every wall and subtract only door openings where skirting truly stops.
- Plan inside and outside mitres; offcuts may be too short for the next wall.
- Check whether corners, end caps, adhesive and fixings are included.
- Leave room for the floor manufacturer's required perimeter movement gap behind the trim.
Final check
Measure every exposed wall segment and deduct actual openings only where skirting will not run. Next, add short returns, corners and a realistic cutting allowance; ordering the room perimeter alone often overlooks junctions around door frames. For a net 14 m run and nominal 2.4 m lengths, 14 ÷ 2.4 = 5.84, so at least six lengths are required before unusable offcuts and mitres.
- Measure each wall run.
- Subtract door openings correctly.
- Allow waste for corners and joints.
- Confirm piece length before ordering.
Keep a small job sheet
Record each wall segment, door openings, stock length, profile height and joint plan.
Turn the guide into a decision
Sketch each uninterrupted wall run and decide whether offcuts can serve shorter sections. Measure the product's available length, expansion-gap coverage and any curved or damp-prone locations; the smallest mathematical quantity is not always the installable one.