Sample cost plan
Cob cottage remodel, Cornwall: materials cost plan
A real planning-stage job for a Cornish architecture practice, shared with the names removed. Materials only, ex VAT, prices read from merchant product pages on 5 Nov 2026.
Get one for your projectFrom £95, fixed by floor area
Structural alterations£1,121
Rebuild and external envelope£5,991
Internal walls and fit-out£3,022
Windows and doors£6,253
Finishes£6,819
Kitchen and utility£6,987
Bathrooms and services£11,238
External works£10,632
Low to high rangeMid figure (shown on the right)Scale: £0 to £13,000, gridlines every £1,300
Totals by element
Low uses the cheapest product that meets the specification; mid uses the local merchant where it stocks the item; high uses an upgraded product.
| Element | Low | Mid | High |
|---|---|---|---|
| Structural alterations | £1,053 | £1,121 | £1,169 |
| Rebuild and external envelope | £4,903 | £5,991 | £5,991 |
| Internal walls and fit-out | £2,594 | £3,022 | £3,022 |
| Windows and doors | £5,809 | £6,253 | £8,343 |
| Finishes | £3,597 | £6,819 | £12,028 |
| Kitchen and utility | £4,815 | £6,987 | £7,636 |
| Bathrooms and services | £5,711 | £11,238 | £12,130 |
| External works | £8,437 | £10,632 | £12,819 |
| Materials total ex VAT | £36,919 | £52,062 | £63,138 |
One line, built up
Every rate in the workbook is built from products like this, each linked to the merchant's own page, so you can check it.
| Component | Per m² | Product (merchant page) | Unit price | Waste | Per m² |
|---|---|---|---|---|---|
| 100 mm dense concrete blocks, two leaves | 20 blocks | Medium Dense Concrete Block 7.3N 100mm Bradfords | £2.76 | ×1.10 | £60.68 |
| 100 mm PIR cavity board | 0.347 boards | Unilin XT/PR PIR 2400x1200x100mm Bradfords | £62.33 | ×1.10 | £23.81 |
| Wall ties | 2.5 ties | Type 2 Double Triangle Wall Ties 250mm Bradfords | £0.35 | ×1.00 | £0.88 |
| Cement for mortar | 0.5 bags | Blue Circle Mastercrete Cement 25kg Bradfords | £8.56 | ×1.10 | £4.71 |
| Building sand | 0.05 bulk bags | Yellow Building Sand Bulk Bag Bradfords | £67.50 | ×1.10 | £3.71 |
| Rate per m², × 10.7 m² measured = £1,003.51 | £93.79 | ||||
What else is in the workbook
- Measured floor areas: gross internal 134.6 m² and gross external 152.8 m² (architect's figure 150 m²)
- About 170 products from Bradfords, Selco and Wickes, plus two specialist sellers
- A list of items needing a specialist quote: structural steel, labour, scaffolding, skips
- Drawing issues found: one site plan drawn at 1:200 carried a 1:100 scale bar
- A first sheet headed "Read before use" stating that these are estimates you must check
Before you use any figure we send, you must:
- Check the quantities against your own drawings and the site.
- Check the prices with your merchant or builder on the day you buy.
- Use a chartered quantity surveyor for anything a lender, insurer, funder, tender or contract relies on.
Once you use or share our figures, you are responsible for them. Our liability is limited to the fee you paid. You accept this when you place an order.
Want one for your project?
Send the drawings and we reply within one working day with a fixed price.