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 with office above
63.7 m² internal · £117,394.80 inc. VAT
£117,394.80
Selling price inc. VAT
£97,829.00
Before VAT
63.7 m²
Internal floor area · £1,535/m²
10 wks
1115 person-hours of labour
Cost to selling price
Materials£31,139.20Labour (at cost)£33,453.30Provisional allowances£8,400.00Plant hire£980.00Direct cost£73,972.50Overheads — 10% of direct cost£7,397.25Contingency — 5% of direct cost£3,698.63Profit — 15% markup on cost£12,760.26Rounding to nearest £1.00£0.36Net selling price£97,829.00VAT at 20%£19,565.80Total£117,394.80
Pricing coverage
Cost backed by a price100%— of which verified (your prices)0%— of which catalogue allowances (dated 2026-09-24)43.4%— of which provisional allowances11.4%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 | £270.00 | £480.00 | £0.00 | £750.00 |
| Excavation & foundations | £1,462.50 | £2,343.75 | £0.00 | £3,806.25 |
| Floors | £1,800.00 | £2,293.80 | £0.00 | £4,093.80 |
| Structural elements | £1,140.80 | £1,720.20 | £5,000.00 | £7,861.00 |
| External walls | £9,775.20 | £10,538.55 | £0.00 | £20,313.75 |
| Roof | £4,473.70 | £5,956.35 | £0.00 | £10,430.05 |
| Windows & external doors | £5,800.00 | £1,260.00 | £0.00 | £7,060.00 |
| Plumbing & heating | £285.00 | £90.00 | £0.00 | £375.00 |
| Electrical | £531.00 | £1,173.00 | £0.00 | £1,704.00 |
| Insulation & internal linings | £1,166.50 | £4,053.75 | £0.00 | £5,220.25 |
| Internal finishes | £874.50 | £3,363.90 | £0.00 | £4,238.40 |
| Scaffold & access | £0.00 | £0.00 | £2,250.00 | £2,250.00 |
| Plant hire | £980.00 | £0.00 | £0.00 | £980.00 |
| Waste removal | £3,560.00 | £0.00 | £0.00 | £3,560.00 |
| Deliveries | £0.00 | £0.00 | £250.00 | £250.00 |
| Testing & certification | £0.00 | £180.00 | £0.00 | £180.00 |
| Fees & approvals | £0.00 | £0.00 | £900.00 | £900.00 |
Provisional allowances (5)
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.
- Floor structure design structural design required£1,500.00A clear span of 5.4m exceeds what 47×225 C24 joists carry at 400 centres. A structural engineer must size the floor (steel or engineered joists).
- Material deliveries builder to confirm£250.00Delivery charges depend on the supplier and order size. Confirmed against supplier baskets when prices are verified.
- Scaffolding supplier quotation required£2,250.00Independent scaffold to 25m of elevation, two lifts, for the build duration. Scaffold is quoted by the scaffolder; this is an allowance at £45/m per lift.
- 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.
- External staircase supplier quotation required£3,500.00A steel or timber external stair with landing and handrails to the flat, manufactured to suit. Allowance until quoted.
Assumptions (10)
- The room above is ancillary to the house (home office/studio), not a separate dwelling; a fire-rated ceiling to the garage is priced.
- Foundations: trench fill 600mm wide × 1.0m deep in GEN1 concrete under all new external walls.
- Ground floor: 150mm concrete slab on 150mm compacted hardcore.
- could move the price Openings over 2.7m wide may need an engineer-specified lintel or steel; a heavy-duty catalogue lintel has been allowed.
- External walls: facing brick outer skin, 100mm full-fill insulated cavity, 100mm block inner skin.
- The existing consumer unit has spare capacity for the new circuits; if not, a new unit is extra.
- External walls: facing brick outer skin, 100mm full-fill insulated cavity, 100mm block inner skin.
- could move the price Gable roof at 35° on manufacturer-designed trusses, covered in concrete interlocking tile. Truss price is an allowance until the manufacturer quotes.
- 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.
Materials — 65 lines (measured → with waste → purchased)
| Item | Measured | + waste | Buy | Unit price | Cost | Price status |
|---|---|---|---|---|---|---|
| Consumer unit for separate supply electrical · from electrics | 1 nr | 1 | 1 × each | £110.00 | £110.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| LED downlight (fire-rated, dimmable) electrical · from electrics | 9 nr | 9 | 9 × each | £9.00 | £81.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Socket/switch point: faceplate, back box, cable share electrical · from electrics | 14 nr | 14 | 14 × each | £22.00 | £308.00 | 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 |
| Ready-mix concrete GEN1 (foundations) excavation foundations · from foundations | 10.5 m3 | 11.0 | 45 × m³ (0.25 m³ steps) | £32.50 | £1,462.50 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Composite external door set external openings · from doors | 2 nr | 2 | 2 × each | £900.00 | £1,800.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Garage door sectional insulated double external openings · from garage-door | 1 nr | 1 | 1 × each | £1,900.00 | £1,900.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| uPVC double-glazed window (A-rated) per m² external openings · from windows | 5.04 m2 | 5.04 | 6 × m² | £350.00 | £2,100.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Concrete block 100mm 7.3N external walls · from below-dpc, cavity-wall | 1368.3 nr | 1436.8 | 20 × pack of 72 | £130.00 | £2,600.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Building sand external walls · from below-dpc, cavity-wall | 5.58 m3 | 6.14 | 13 × bulk bag | £52.00 | £676.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Full-fill cavity insulation 100mm external walls · from cavity-wall | 114.3 m2 | 122.9 | 29 × pack | £30.00 | £870.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Insulated cavity closer 2.4m external walls · from cavity-wall | 32.7 m | 32.7 | 14 × length | £6.00 | £84.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Cement 25kg external walls · from below-dpc, cavity-wall | 50.7 bag | 55.8 | 56 × bag | £6.50 | £364.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| DPC 100mm × 30m external walls · from cavity-wall | 100 m | 115 | 4 × roll | £9.00 | £36.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Facing brick (standard 65mm) external walls · from cavity-wall | 6860.0 nr | 7203.0 | 15 × pack of 500 | £300.00 | £4,500.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Steel cavity lintel 1200mm external walls · from cavity-wall | 4 nr | 4 | 4 × each | £45.00 | £180.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Steel cavity lintel 1800mm over window external walls · from cavity-wall | 2 nr | 2 | 2 × each | £75.00 | £150.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Steel cavity lintel 3600mm (heavy duty) over garage door external walls · from cavity-wall | 1 nr | 1 | 1 × each | £240.00 | £240.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Stainless wall ties 225mm external walls · from cavity-wall | 343.0 nr | 343.0 | 2 × box of 250 | £35.00 | £70.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Weep vent external walls · from cavity-wall | 13 nr | 13 | 13 × each | £0.40 | £5.20 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Damp-proof membrane 1200 gauge 4m × 25m floors · from slab | 31.9 m2 | 36.6 | 1 × roll | £45.00 | £45.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| MOT Type 1 sub-base 150mm compacted floors · from slab | 6.21 m3 | 6.83 | 14 × bulk bag | £48.00 | £672.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Reinforcement mesh A142 4.8m × 2.4m floors · from slab | 31.9 m2 | 36.6 | 4 × sheet | £32.00 | £128.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Ready-mix concrete GEN3 150mm slab floors · from slab | 4.78 m3 | 5.02 | 21 × m³ (0.25 m³ steps) | £35.00 | £735.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Sand blinding 50mm floors · from slab | 1.59 m3 | 1.75 | 4 × bulk bag | £55.00 | £220.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Drywall adhesive 25kg (dot and dab) insulation linings · from linings | 65.7 m2 | 69.0 | 23 × bag | £8.00 | £184.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Drywall screws 38mm box of 1000 insulation linings · from ceiling | 955.8 nr | 955.8 | 1 × box | £12.00 | £12.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Loft insulation 270mm at ceiling level insulation linings · from trussed-roof | 31.9 m2 | 34.3 | 7 × m² (two rolls) | £42.50 | £297.50 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Plasterboard 12.5mm 2400×1200 insulation linings · from linings, ceiling | 97.5 m2 | 107.3 | 38 × sheet | £8.50 | £323.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Two layers 15mm fire-rated board to underside of floor insulation linings · from fire-ceiling | 63.7 m2 | 70.1 | 25 × sheet | £14.00 | £350.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Angle beads to reveals internal finishes · from skim | 18.9 m | 18.9 | 8 × length | £2.00 | £16.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Emulsion paint 10L (mist + two coats ≈ 60 m²) internal finishes · from decorating | 97.5 m2 | 97.5 | 2 × tub | £32.00 | £64.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Laminate flooring 8mm (pack 2.2 m²) internal finishes · from flooring | 31.9 m2 | 34.4 | 16 × pack | £30.00 | £480.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Multi-finish plaster 25kg internal finishes · from skim | 97.5 m2 | 102.4 | 11 × bag | £9.50 | £104.50 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Satinwood 2.5L (≈ 20 m of skirting/architrave) internal finishes · from decorating | 21.7 m | 21.7 | 2 × tin | £28.00 | £56.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Scrim tape 90m internal finishes · from skim | 117.0 m | 117.0 | 2 × roll | £5.00 | £10.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| MDF skirting 145mm × 4.4m internal finishes · from skirting | 21.7 m | 23.9 | 6 × length | £12.00 | £72.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Laminate underlay 3mm (roll 15 m²) internal finishes · from flooring | 31.9 m2 | 34.4 | 3 × roll | £24.00 | £72.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| 1t dumper hire per day plant · from foundations | 3 day | 3 | 3 × day | £70.00 | £210.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| 1.5t mini digger hire per day plant · from foundations | 3 day | 3 | 3 × day | £95.00 | £285.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Cement mixer hire per week plant · from prelims | 9 wk | 9 | 9 × week | £45.00 | £405.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Plant delivery/collection plant · from foundations | 1 nr | 1 | 1 × each | £80.00 | £80.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Electric panel heater 1.5kW plumbing heating · from panel-heaters | 3 nr | 3 | 3 × each | £95.00 | £285.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Site toilet hire per week preliminaries · from prelims | 9 wk | 9 | 9 × week | £30.00 | £270.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Breathable roofing membrane 50m² roof · from trussed-roof | 57.2 m2 | 65.8 | 2 × roll | £55.00 | £110.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Bracing and binders 47×100 roof · from trussed-roof | 46.9 m | 51.5 | 52 × m | £2.40 | £124.80 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| uPVC downpipe 68mm × 2.5m with clips & shoe roof · from trussed-roof | 4 nr | 4 | 4 × each | £18.00 | £72.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Dry verge system per m roof · from trussed-roof | 16.1 m | 16.1 | 17 × m | £11.00 | £187.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| uPVC fascia board 175mm × 5m roof · from trussed-roof | 14.2 m | 15.6 | 4 × length | £32.00 | £128.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| uPVC half-round gutter 112mm × 4m roof · from trussed-roof | 14.2 m | 15.6 | 4 × length | £14.00 | £56.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Gutter bracket roof · from trussed-roof | 14.2 nr | 14.2 | 15 × each | £1.30 | £19.50 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Gutter fittings (outlet, stop ends, unions) per run roof · from trussed-roof | 2 nr | 2 | 2 × set | £25.00 | £50.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Ridge tiles with dry-fix system per m roof · from trussed-roof | 7.10 m | 7.10 | 8 × m | £33.00 | £264.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Roofing batten 25×50 treated (graded) roof · from trussed-roof | 165.9 m | 182.5 | 183 × m | £0.80 | £146.40 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Roof trusses (gable, 35°) designed and supplied roof · from trussed-roof | 46.9 m2 | 46.9 | 47 × m² plan | £45.00 | £2,115.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| uPVC soffit board 300mm × 5m roof · from trussed-roof | 14.2 m | 15.6 | 4 × length | £30.00 | £120.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Tile clips and nails (per m² allowance) roof · from trussed-roof | 57.2 m2 | 57.2 | 58 × m² | £0.90 | £52.20 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Concrete interlocking tile roof · from trussed-roof | 572.0 nr | 600.7 | 601 × each | £1.60 | £961.60 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Wall plate 100×50 treated roof · from trussed-roof | 25 m | 27.5 | 28 × m | £2.40 | £67.20 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Sound insulation between floor joists structural · from int-floor | 31.9 m2 | 34.3 | 5 × pack | £32.00 | £160.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Floor joists C24 47×225 @ 400 centres structural · from int-floor | 79.7 m | 87.6 | 88 × m | £5.80 | £510.40 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Chipboard flooring 22mm T&G 2400×600 structural · from int-floor | 31.9 m2 | 35.0 | 25 × sheet | £16.00 | £400.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Joist hanger 47mm structural · from int-floor | 32 nr | 32 | 32 × each | £2.20 | £70.40 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Muck-away of excavated spoil (grab lorry) waste · from foundations | 6 nr | 6 | 6 × load | £380.00 | £2,280.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Skips for construction waste waste · from waste | 4 nr | 4 | 4 × each | £320.00 | £1,280.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
Labour — 40 activities
| Activity | Qty | Crew hrs | Person hrs | Rate basis | Cost |
|---|---|---|---|---|---|
| Excavate trenches and reduced level (machine) Groundworker · 0.60 h/m3 · min 8h · +4h setup | 24.8 m3 | 18.85 | 37.7 | 1× groundworker @ £30.00/hr + 1× labourer @ £30.00/hr blended | £1,131.00 |
| Place and level foundation concrete Groundworker · 0.80 h/m3 · min 4h | 10.5 m3 | 8.4 | 16.8 | 2× groundworker @ £30.00/hr blended | £504.00 |
| Blockwork below DPC Bricklayer · 0.70 h/m2 | 22.5 m2 | 15.75 | 23.63 | 1× bricklayer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £708.75 |
| Hardcore, blind, DPM, insulation, mesh and pour slab Groundworker · 1.20 h/m2 · min 8h | 31.9 m2 | 38.23 | 76.46 | 2× groundworker @ £30.00/hr blended | £2,293.80 |
| Facing brickwork outer skin Bricklayer · 1.20 h/m2 · min 8h | 48.7 m2 | 58.39 | 87.59 | 1× bricklayer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £2,627.55 |
| Blockwork inner skin Bricklayer · 0.70 h/m2 · min 8h | 48.7 m2 | 34.06 | 51.09 | 1× bricklayer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £1,532.70 |
| Wall ties, cavity insulation and closers Bricklayer · 0.10 h/m2 | 48.7 m2 | 4.87 | 4.87 | 1× bricklayer @ £30.00/hr blended | £146.10 |
| Bed lintels Bricklayer · 1.00 h/nr | 2 nr | 2 | 4 | 1× bricklayer @ £30.00/hr + 1× labourer @ £30.00/hr blended | £120.00 |
| Fit garage door Carpenter / joiner · 5.00 h/nr | 1 nr | 5 | 10 | 2× carpenter / joiner @ £30.00/hr blended | £300.00 |
| Fit external door set Carpenter / joiner · 3.00 h/nr | 1 nr | 3 | 6 | 2× carpenter / joiner @ £30.00/hr blended | £180.00 |
| Electrical first fix: cables, back boxes, circuits Electrician · 1.10 h/nr · min 4h | 6 nr | 6.6 | 6.6 | 1× electrician @ £30.00/hr blended | £198.00 |
| Electrical second fix: faceplates, fittings, connection Electrician · 0.60 h/nr · min 3h | 6 nr | 3.6 | 3.6 | 1× electrician @ £30.00/hr blended | £108.00 |
| Test, certify and notify (Part P / equivalent) Electrician · 3.00 h/nr | 1 nr | 3 | 3 | 1× electrician @ £30.00/hr blended | £90.00 |
| First-floor joists, strutting and decking Carpenter / joiner · 0.90 h/m2 · min 8h | 31.9 m2 | 28.67 | 57.34 | 2× carpenter / joiner @ £30.00/hr blended | £1,720.20 |
| Fire-rated ceiling to garage (two layers, staggered) Plasterer · 0.80 h/m2 | 31.9 m2 | 25.49 | 50.98 | 1× plasterer @ £30.00/hr + 1× labourer @ £30.00/hr blended | £1,529.40 |
| Facing brickwork outer skin Bricklayer · 1.20 h/m2 · min 8h | 65.7 m2 | 78.81 | 118.22 | 1× bricklayer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £3,546.45 |
| Blockwork inner skin Bricklayer · 0.70 h/m2 · min 8h | 65.7 m2 | 45.97 | 68.96 | 1× bricklayer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £2,068.65 |
| Wall ties, cavity insulation and closers Bricklayer · 0.10 h/m2 | 65.7 m2 | 6.57 | 6.57 | 1× bricklayer @ £30.00/hr blended | £197.10 |
| Bed lintels Bricklayer · 1.00 h/nr | 5 nr | 5 | 10 | 1× bricklayer @ £30.00/hr + 1× labourer @ £30.00/hr blended | £300.00 |
| Set out and fix roof trusses with bracing Carpenter / joiner · 0.80 h/m2 · min 8h | 46.9 m2 | 37.49 | 74.98 | 2× carpenter / joiner @ £30.00/hr blended | £2,249.40 |
| Breathable membrane and battens Roofer · 0.25 h/m2 · min 4h | 57.2 m2 | 14.3 | 28.6 | 1× roofer @ £30.00/hr + 1× labourer @ £30.00/hr blended | £858.00 |
| Lay concrete interlocking tiles Roofer · 0.60 h/m2 · min 8h | 57.2 m2 | 34.32 | 68.64 | 1× roofer @ £30.00/hr + 1× labourer @ £30.00/hr blended | £2,059.20 |
| Ridge, hip and verge details Roofer · 0.45 h/m | 23.2 m | 10.45 | 15.68 | 1× roofer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £470.25 |
| Lay loft insulation Labourer · 0.15 h/m2 | 31.9 m2 | 4.78 | 4.78 | 1× labourer @ £30.00/hr blended | £143.40 |
| Fascia, soffit, guttering and downpipes Carpenter / joiner · 0.50 h/m · min 4h | 14.2 m | 7.1 | 10.65 | 1× carpenter / joiner @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £319.50 |
| Fit windows, seal and make good Carpenter / joiner · 2.50 h/nr | 2 nr | 5 | 10 | 2× carpenter / joiner @ £30.00/hr blended | £300.00 |
| Fit windows, seal and make good Carpenter / joiner · 2.50 h/nr | 2 nr | 5 | 10 | 2× carpenter / joiner @ £30.00/hr blended | £300.00 |
| Fit external door set Carpenter / joiner · 3.00 h/nr | 1 nr | 3 | 6 | 2× carpenter / joiner @ £30.00/hr blended | £180.00 |
| Electrical first fix: cables, back boxes, circuits Electrician · 1.10 h/nr · min 4h | 17 nr | 18.7 | 18.7 | 1× electrician @ £30.00/hr blended | £561.00 |
| Electrical second fix: faceplates, fittings, connection Electrician · 0.60 h/nr · min 3h | 17 nr | 10.2 | 10.2 | 1× electrician @ £30.00/hr blended | £306.00 |
| Test, certify and notify (Part P / equivalent) Electrician · 3.00 h/nr | 1 nr | 3 | 3 | 1× electrician @ £30.00/hr blended | £90.00 |
| Fix and wire panel heaters Electrician · 1.00 h/nr | 3 nr | 3 | 3 | 1× electrician @ £30.00/hr blended | £90.00 |
| Dot and dab plasterboard to walls Plasterer · 0.45 h/m2 · min 4h | 65.7 m2 | 29.55 | 44.33 | 1× plasterer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £1,329.75 |
| Board ceiling Plasterer · 0.55 h/m2 · min 4h | 31.9 m2 | 17.52 | 35.04 | 1× plasterer @ £30.00/hr + 1× labourer @ £30.00/hr blended | £1,051.20 |
| Skim walls and ceilings Plasterer · 0.35 h/m2 · min 4h | 97.5 m2 | 34.14 | 51.21 | 1× plasterer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £1,536.30 |
| Fix skirting Carpenter / joiner · 0.30 h/m · min 2h | 21.7 m | 6.51 | 6.51 | 1× carpenter / joiner @ £30.00/hr blended | £195.30 |
| Mist coat and two coats emulsion to walls and ceilings Decorator · 0.35 h/m2 · min 4h | 97.5 m2 | 34.14 | 34.14 | 1× decorator @ £30.00/hr blended | £1,024.20 |
| Prime and two coats to woodwork Decorator · 0.20 h/m | 21.7 m | 4.34 | 4.34 | 1× decorator @ £30.00/hr blended | £130.20 |
| Lay laminate flooring and underlay Carpenter / joiner · 0.50 h/m2 · min 3h | 31.9 m2 | 15.93 | 15.93 | 1× carpenter / joiner @ £30.00/hr blended | £477.90 |
| 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 |
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 |
|---|---|---|---|---|---|---|
| Garage | 31.86 | 25.00 | 48.66 | 0.00 | 0.00 | 25.00 |
| Office above | 31.86 | 25.00 | 65.67 | 57.20 | 14.20 | 0.00 |