Fictional demo. Computed live by the estimating engine from a template's default answers, default labour rates and dated catalogue allowances. It is not a real business, customer or supplier price.
Live demo
Garage conversion
16.5 m² internal · £18,280.80 inc. VAT
£18,280.80
Selling price inc. VAT
£15,234.00
Before VAT
16.5 m²
Internal floor area · £923/m²
2 wks
189 person-hours of labour
Cost to selling price
Materials£4,707.50Labour (at cost)£5,661.45Provisional allowances£1,150.00Plant hire£0.00Direct cost£11,518.95Overheads — 10% of direct cost£1,151.90Contingency — 5% of direct cost£575.95Profit — 15% markup on cost£1,987.02Rounding to nearest £1.00£0.18Net selling price£15,234.00VAT at 20%£3,046.80Total£18,280.80
Pricing coverage
Cost backed by a price100%— of which verified (your prices)0%— of which catalogue allowances (dated 2026-09-24)40.9%— of which provisional allowances10%Lines missing a price0Stale prices0Assumptions that could move the price2
Selling price before VAT divided by internal floor area. A reasonableness check only — it does not replace the line-by-line estimate. Template status: provisional
By work package (at cost)
| Package | Materials | Labour | Allowances | Total |
|---|---|---|---|---|
| Preliminaries & site setup | £60.00 | £480.00 | £0.00 | £540.00 |
| Excavation & foundations | £97.50 | £360.00 | £0.00 | £457.50 |
| Floors | £519.00 | £247.50 | £0.00 | £766.50 |
| External walls | £560.00 | £360.00 | £0.00 | £920.00 |
| Windows & external doors | £1,050.00 | £150.00 | £0.00 | £1,200.00 |
| Plumbing & heating | £329.00 | £324.00 | £0.00 | £653.00 |
| Electrical | £244.00 | £612.00 | £0.00 | £856.00 |
| Insulation & internal linings | £840.50 | £1,290.45 | £0.00 | £2,130.95 |
| Internal finishes | £687.50 | £1,747.50 | £0.00 | £2,435.00 |
| Waste removal | £320.00 | £0.00 | £0.00 | £320.00 |
| Deliveries | £0.00 | £0.00 | £250.00 | £250.00 |
| Testing & certification | £0.00 | £90.00 | £0.00 | £90.00 |
| Fees & approvals | £0.00 | £0.00 | £900.00 | £900.00 |
Provisional allowances (2)
Items that need a design, a supplier quotation or your confirmation. Edit the figure, or confirm it, on the review page. Material allowances appear on the customer's quote as provisional sums.
- Material deliveries builder to confirm£250.00Delivery charges depend on the supplier and order size. Confirmed against supplier baskets when prices are verified.
- Building control fees regulatory£900.00Plan check and inspection fees vary by council and project value. Allowance only; confirm with your local authority or approved inspector.
Assumptions (7)
- could move the price Existing slab is sound and level; a damp-proof membrane, 100mm insulation and a new deck are laid over it.
- could move the price Existing flat roof is sound; 120mm insulation added between/under joists and a new ceiling.
- The existing consumer unit has spare capacity for the new circuits; if not, a new unit is extra.
- Heating: 2 radiators added to the existing system; the existing boiler is assumed to have capacity.
- No planning application fee, party wall surveyor or planning drawings are included. Permitted development or existing consent is assumed.
- Work to comply with the building regulations applying in England; design by others where a design is required.
- Garage door infill to match existing brickwork; a matching brick is assumed available.
Materials — 33 lines (measured → with waste → purchased)
| Item | Measured | + waste | Buy | Unit price | Cost | Price status |
|---|---|---|---|---|---|---|
| LED downlight (fire-rated, dimmable) electrical · from electrics | 4 nr | 4 | 4 × each | £9.00 | £36.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Socket/switch point: faceplate, back box, cable share electrical · from electrics | 8 nr | 8 | 8 × each | £22.00 | £176.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Mains smoke/heat alarm interlinked electrical · from electrics | 1 nr | 1 | 1 × each | £32.00 | £32.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Foundation under infill wall excavation foundations · from infill | 0.61 m3 | 0.64 | 3 × m³ (0.25 m³ steps) | £32.50 | £97.50 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| uPVC double-glazed window (A-rated) per m² — 1.8×1.2m ×1 external openings · from windows | 2.16 m2 | 2.16 | 3 × m² | £350.00 | £1,050.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Block inner skin to infill external walls · from infill | 28.8 nr | 30.2 | 1 × pack of 72 | £130.00 | £130.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Building sand external walls · from infill | 0.13 m3 | 0.15 | 1 × bulk bag | £52.00 | £52.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Cavity wall insulation batt 100mm (full fill) external walls · from infill | 2.88 m2 | 3.10 | 1 × pack | £30.00 | £30.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Cement 25kg external walls · from infill | 1.21 bag | 1.33 | 2 × bag | £6.50 | £13.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Facing brick infill to garage door opening external walls · from infill | 172.8 nr | 181.4 | 1 × pack of 500 | £300.00 | £300.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Stainless wall ties 225mm external walls · from infill | 8.64 nr | 8.64 | 1 × box of 250 | £35.00 | £35.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Floating chipboard deck floors · from floor-upgrade | 16.5 m2 | 18.1 | 13 × sheet | £16.00 | £208.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| DPM over existing slab floors · from floor-upgrade | 16.5 m2 | 19.0 | 1 × roll | £45.00 | £45.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| PIR floor insulation 100mm over existing slab floors · from floor-upgrade | 16.5 m2 | 17.7 | 7 × sheet | £38.00 | £266.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Drywall adhesive 25kg (dot and dab) insulation linings · from linings | 27.1 m2 | 28.4 | 10 × bag | £8.00 | £80.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Drywall screws 38mm box of 1000 insulation linings · from ceiling | 495 nr | 495 | 1 × box | £12.00 | £12.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Insulated plasterboard 62.5mm dot-and-dab to walls insulation linings · from linings | 27.1 m2 | 29.8 | 11 × sheet | £34.00 | £374.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| PIR insulation 120mm to existing flat roof (between/under joists) insulation linings · from roof-upgrade | 16.5 m2 | 17.7 | 7 × sheet | £45.00 | £315.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Plasterboard 12.5mm to ceiling insulation linings · from ceiling | 16.5 m2 | 18.1 | 7 × sheet | £8.50 | £59.50 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Angle beads to reveals internal finishes · from skim | 4.20 m | 4.20 | 2 × length | £2.00 | £4.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Emulsion paint 10L (mist + two coats ≈ 60 m²) internal finishes · from decorating | 43.5 m2 | 43.5 | 1 × tub | £32.00 | £32.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Internal door, lining, architrave & ironmongery internal finishes · from int-doors | 1 nr | 1 | 1 × set | £165.00 | £165.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Laminate flooring 8mm (pack 2.2 m²) internal finishes · from flooring | 16.5 m2 | 17.8 | 9 × pack | £30.00 | £270.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Multi-finish plaster 25kg internal finishes · from skim | 43.5 m2 | 45.7 | 5 × bag | £9.50 | £47.50 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Satinwood 2.5L (≈ 20 m of skirting/architrave) internal finishes · from decorating | 20.2 m | 20.2 | 2 × tin | £28.00 | £56.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Scrim tape 90m internal finishes · from skim | 52.3 m | 52.3 | 1 × roll | £5.00 | £5.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| MDF skirting 145mm × 4.4m internal finishes · from skirting | 16.2 m | 17.8 | 5 × length | £12.00 | £60.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Laminate underlay 3mm (roll 15 m²) internal finishes · from flooring | 16.5 m2 | 17.8 | 2 × roll | £24.00 | £48.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Push-fit fittings per radiator/appliance plumbing heating · from radiators | 2 nr | 2 | 2 × set | £18.00 | £36.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Plastic push-fit pipe 15mm 50m coil plumbing heating · from radiators | 16 m | 17.6 | 1 × coil | £45.00 | £45.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Double panel radiator 600×1000 with TRV & valves plumbing heating · from radiators | 2 nr | 2 | 2 × each | £124.00 | £248.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Site toilet hire per week preliminaries · from prelims | 2 wk | 2 | 2 × week | £30.00 | £60.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Skips for construction waste waste · from waste | 1 nr | 1 | 1 × each | £320.00 | £320.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
Labour — 19 activities
| Activity | Qty | Crew hrs | Person hrs | Rate basis | Cost |
|---|---|---|---|---|---|
| Lay DPM, insulation and floating deck over existing slab Carpenter / joiner · 0.50 h/m2 · min 4h | 16.5 m2 | 8.25 | 8.25 | 1× carpenter / joiner @ £30.00/hr blended | £247.50 |
| Insulate existing flat roof from below Carpenter / joiner · 0.40 h/m2 · min 3h | 16.5 m2 | 6.6 | 6.6 | 1× carpenter / joiner @ £30.00/hr blended | £198.00 |
| Fit windows, seal and make good Carpenter / joiner · 2.50 h/nr | 1 nr | 2.5 | 5 | 2× carpenter / joiner @ £30.00/hr blended | £150.00 |
| Electrical first fix: cables, back boxes, circuits Electrician · 1.10 h/nr · min 4h | 12 nr | 13.2 | 13.2 | 1× electrician @ £30.00/hr blended | £396.00 |
| Electrical second fix: faceplates, fittings, connection Electrician · 0.60 h/nr · min 3h | 12 nr | 7.2 | 7.2 | 1× electrician @ £30.00/hr blended | £216.00 |
| Test, certify and notify (Part P / equivalent) Electrician · 3.00 h/nr | 1 nr | 3 | 3 | 1× electrician @ £30.00/hr blended | £90.00 |
| Heating first fix: run pipework from existing system Plumber / heating engineer · 0.30 h/m · min 4h | 16 m | 4.8 | 4.8 | 1× plumber / heating engineer @ £30.00/hr blended | £144.00 |
| Hang radiators, connect, balance and test Plumber / heating engineer · 3.00 h/nr | 2 nr | 6 | 6 | 1× plumber / heating engineer @ £30.00/hr blended | £180.00 |
| Dot and dab plasterboard to walls Plasterer · 0.45 h/m2 · min 4h | 27.1 m2 | 12.17 | 18.26 | 1× plasterer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £547.65 |
| Board ceiling Plasterer · 0.55 h/m2 · min 4h | 16.5 m2 | 9.08 | 18.16 | 1× plasterer @ £30.00/hr + 1× labourer @ £30.00/hr blended | £544.80 |
| Skim walls and ceilings Plasterer · 0.35 h/m2 · min 4h | 43.5 m2 | 15.24 | 22.86 | 1× plasterer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £685.80 |
| Fix skirting Carpenter / joiner · 0.30 h/m · min 2h | 16.2 m | 4.86 | 4.86 | 1× carpenter / joiner @ £30.00/hr blended | £145.80 |
| Fit linings, hang doors, architraves and ironmongery Carpenter / joiner · 3.00 h/nr | 1 nr | 3 | 3 | 1× carpenter / joiner @ £30.00/hr blended | £90.00 |
| Mist coat and two coats emulsion to walls and ceilings Decorator · 0.35 h/m2 · min 4h | 43.5 m2 | 15.24 | 15.24 | 1× decorator @ £30.00/hr blended | £457.20 |
| Prime and two coats to woodwork Decorator · 0.20 h/m | 20.2 m | 4.04 | 4.04 | 1× decorator @ £30.00/hr blended | £121.20 |
| Lay laminate flooring and underlay Carpenter / joiner · 0.50 h/m2 · min 3h | 16.5 m2 | 8.25 | 8.25 | 1× carpenter / joiner @ £30.00/hr blended | £247.50 |
| Site set-up, protection, welfare and daily clean General builder · 8.00 h/nr | 1 nr | 8 | 16 | 1× general builder @ £30.00/hr + 1× labourer @ £30.00/hr blended | £480.00 |
| Excavate and concrete foundation under infill Groundworker · 6.00 h/nr | 1 nr | 6 | 12 | 1× groundworker @ £30.00/hr + 1× labourer @ £30.00/hr blended | £360.00 |
| Build up infill wall in matching brick and block Bricklayer · 1.90 h/m2 · min 8h | 2.88 m2 | 8 | 12 | 1× bricklayer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £360.00 |
BuildLegend platform default v1 — provisional, derived from published UK estimating norms; validate against your own site records.
Measured geometry
| Module | Floor m² | New wall m | Net wall m² | Roof slope m² | Eaves m | Foundation m |
|---|---|---|---|---|---|---|
| Converted garage | 16.50 | 12.70 | 27.05 | 0.00 | 0.00 | 0.00 |