In short
- The calculator uses published 2026 UK supply-and-fit ranges per m²: sand and cement £40–£80, monocouche £55–£90, silicone £60–£120, lime £65–£140, external wall insulation £90–£150.
- It adds a levelling coat when rendering over sound pebbledash, removal and skips when old render must come off, and scaffolding for two-storey houses.
- Guildford and Surrey quotes usually land in the upper half of each range because South East labour costs run 15–25% above the national average.
- An estimate is not a quote. We give you a fixed price in writing after a free survey of your walls.
How the estimate is worked out
The calculator multiplies your wall area by a per-m² range for the system you choose, then adds the extras that most often appear on Surrey quotes:
| Item | Range used |
|---|---|
| Sand and cement, painted | £40–£80 per m² |
| Monocouche or K-Rend scraped | £55–£90 per m² |
| Silicone thin-coat | £60–£120 per m² |
| Lime render | £65–£140 per m² |
| External wall insulation with render | £90–£150 per m² |
| Levelling coat over sound pebbledash | +£6–£12 per m² |
| Stripping failed render | +£10–£18 per m², plus £250–£640 in skips |
| Scaffolding, two-storey house | £800–£2,500 |
These are published 2026 UK market ranges for supply and fit, drawn from national cost guides. They are guidance, not our prices. Our 2026 rendering cost guide explains where they come from and what each system involves.
How to measure your walls
For a better estimate, measure rather than guess:
- Measure the length of each wall you want rendered.
- Multiply by its height to the eaves. Gables are roughly half the width multiplied by the height of the triangle.
- Subtract large openings such as doors, patio doors and big windows.
- Add the elevations together and type the total into the wall area box.
What moves the real price
- Substrate condition. Hollow, cracked or damp walls need more preparation. See why render cracks.
- Detail. Bays, gables, chimneys and lots of windows mean more beads and more labour.
- Access. Conservatories, steep drives and narrow side passages make scaffolding harder.
- Colour and system. Some dark or special colours cost more and may be restricted on some systems. See choosing a render colour.
- Building Regulations. Large re-renders can trigger an insulation upgrade. See Building Regulations for rendering.
From estimate to quote
Once you have a budget, the next step is a survey. We tap the walls for hollow areas, finds the damp-proof course, checks the sills and roof overhang, and then quote in writing, naming the exact system, finish and colour. Our quotes always do exactly that, and our quote comparison checklist shows what to look for in any quote.
Questions people ask
How accurate is the rendering cost calculator?
It gives a realistic range based on published 2026 UK market rates, not a quote. The condition of your walls, access, detailing and your exact postcode move the real price. Use it to budget, then compare written quotes.
What wall area does the calculator assume?
Typical net wall areas, after windows and doors: about 55 m² for a mid-terrace front and back, 105 m² for a three-bed semi, 165 m² for a detached house and 85 m² for a bungalow. You can type your own measurement.
Is scaffolding included?
Yes. The calculator adds £800–£2,500 for a two-storey house and up to £600 for access towers on bungalows and single-storey extensions.
Why do Surrey quotes come in higher than national averages?
Labour, scaffolding and disposal cost more across London and the South East, and many Surrey houses have bays, gables and period detail that take longer to render properly.
Can I get an exact price?
Yes. Send the form on this page and we will book a free survey. After it, you get a fixed written quotation with no obligation to go ahead.