Free tools

Roof project planner

Rough out how big your roof is and roughly what goes on it, or put together a short brief for a loft conversion. Handy before you start ringing round for quotes.

How it works Roof surface ≈ footprint ÷ cos(pitch)

Good enough for a ballpark on a simple roof. Valleys, dormers, hips and awkward access all need someone to come and measure.

Roof calculator

Pitched-roof calculator

Measure the house footprint, pick the pitch, and put in how many tiles per square metre your chosen tile needs. That figure is on the manufacturer's data sheet.

  • Roughly how big the roof surface is
  • About how many tiles or slates
  • How many rolls of membrane
  • Metres of batten
Check the exact product datasheet.
Use effective coverage after specified laps.
Gauge must be confirmed for the selected roof covering and pitch.
Roof surface—approximate m²
Tiles or slates—units including allowance
Membrane—whole rolls
Battens—approximate linear metres

A rough guide only. Please do not order materials off these numbers. Get the roof measured properly first.

Thinking about a loft conversion?

Loft conversion scope builder

Before any building starts

What a loft enquiry should cover

01

Existing roof

The shape of the roof, what it is covered in, how much head height there is.

02

Design and approvals

Planning, structural drawings, building regs, fire escape and party wall agreements.

03

External weathering

The dormer roof, roof windows, insulation and ventilation, and how it all joins your existing roof.

Next step

From a rough number to a real quote

Send us your rough measurements, the postcode and a few photos. We will talk it through and come and measure properly if it makes sense.

Get a free quote
Free quotes across West London

Roof playing up? Give us a ring

Call now 07584 213 770