Worked example: a 195m² home in rural Perthshire
| Item | Amount |
|---|---|
| Plot, rural Perthshire, with PPP | £130,000 |
| LBTT on the plot (non-residential rates) | £0 |
| Solicitor and conveyancing | £2,500 |
| Design: all eight stages, illustrative fixed-fee allowance | £34,000 |
| Structural engineer | £6,000 |
| Energy assessment | £1,000 |
| Topographic survey | £900 |
| Ground investigation | £1,800 |
| Ecology surveys | £1,400 |
| Planning fee and reports | £2,200 |
| Building Warrant fee, after certifier discounts | £4,000 |
| Water connection | £4,500 |
| Private drainage | £9,500 |
| Electricity connection | £6,500 |
| Site insurance | £1,800 |
| Structural warranty | £2,800 |
| Construction: 195m² at £3,100/m² | £604,500 |
| External works and landscaping | £32,000 |
| Finance costs during the build | £18,000 |
| Contingency: 12% of construction | £72,540 |
| Illustrative project budget | £935,940 |
This is a modelled scenario, not a specific ED Design project or a quotation. Figures are illustrative.
Any potential DIY Housebuilders VAT refund is not included in this budget. A refund depends on a schedule of qualifying materials, VAT invoices and HMRC eligibility, and is subject to the claim deadline, so it shouldn't be treated as guaranteed finance for the build.
For illustrative cost-per-square-metre ranges, see how much it costs to build a house in Scotland.
Five costs most often underestimated
- Services. Service connections on rural plots vary enormously, from a few thousand pounds to far more where mains water, a sewer or the electricity network is distant. Get written quotations from Scottish Water and the network operator before you commit.
- External works. Drives, paths, walls, fencing and planting on a rural plot are often a significant sum, and frequently excluded from the builder's price.
- Finance. Interest during a 12–18 month build adds up quickly.
- Ecology surveys. Often needed on rural sites, and seasonal, so they can delay the programme as well as cost money.
- Contingency. Budget 10–15% of the construction cost.
The most important line
The self-builders who get into financial difficulty are almost always the ones who budgeted with no margin. A real contingency is what lets you deal with surprises calmly.
Sources: HMRC: VAT refunds for DIY housebuilders; Revenue Scotland: Land and Buildings Transaction Tax. Last reviewed October 2026.
Questions
How much contingency should I allow for a self-build?
10–15% of the construction cost.
What costs do self-builders forget?
Most often services connections, external works, finance costs during the build, surveys and an adequate contingency.
General guidance for Scotland, not legal, tax, financial or planning advice for your project. Rules change, so check current official guidance and take advice specific to your site before acting.
