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
Conservatory or orangery
12.9 m² internal · £48,738.00 inc. VAT
£48,738.00
Selling price inc. VAT
£40,615.00
Before VAT
12.9 m²
Internal floor area · £3,143/m²
3 wks
336 person-hours of labour
Cost to selling price
Materials£9,747.70Labour (at cost)£10,082.70Provisional allowances£10,500.00Plant hire£380.00Direct cost£30,710.40Overheads — 10% of direct cost£3,071.04Contingency — 5% of direct cost£1,535.52Profit — 15% markup on cost£5,297.54Rounding to nearest £1.00£0.50Net selling price£40,615.00VAT at 20%£8,123.00Total£48,738.00
Pricing coverage
Cost backed by a price100%— of which verified (your prices)0%— of which catalogue allowances (dated 2026-09-24)33%— of which provisional allowances34.2%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 | £90.00 | £480.00 | £0.00 | £570.00 |
| Excavation & foundations | £1,040.00 | £1,271.85 | £0.00 | £2,311.85 |
| Floors | £1,095.00 | £1,240.20 | £0.00 | £2,335.20 |
| External walls | £456.00 | £739.80 | £0.00 | £1,195.80 |
| Roof | £2,020.20 | £2,225.10 | £0.00 | £4,245.30 |
| Windows & external doors | £1,600.00 | £1,272.00 | £9,350.00 | £12,222.00 |
| Drainage | £306.00 | £600.00 | £0.00 | £906.00 |
| Plumbing & heating | £329.00 | £324.00 | £0.00 | £653.00 |
| Electrical | £138.00 | £306.00 | £0.00 | £444.00 |
| Insulation & internal linings | £211.50 | £939.15 | £0.00 | £1,150.65 |
| Internal finishes | £552.00 | £594.60 | £0.00 | £1,146.60 |
| Scaffold & access | £450.00 | £0.00 | £0.00 | £450.00 |
| Plant hire | £380.00 | £0.00 | £0.00 | £380.00 |
| Waste removal | £1,460.00 | £0.00 | £0.00 | £1,460.00 |
| 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 (3)
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.
- Glazed wall frames and doors supplier quotation required£9,350.00Conservatory/orangery frames and glazed roof panels to 11.0m of elevation. These are manufactured to order; the allowance is replaced by the supplier's quotation.
- 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 (11)
- could move the price Conservatories under 30 m² separated from the house by external-quality doors are usually exempt from building regulations; an orangery with a solid roof generally is not.
- Foundations: trench fill 600mm wide × 1.0m deep in GEN1 concrete under all new external walls.
- Ground floor: 100mm concrete slab on 150mm compacted hardcore with 100mm PIR insulation.
- could move the price Glazed frames sit on a 600mm cavity dwarf wall; frames priced as a supplier allowance.
- Roof lantern priced at a standard 2m × 1m size; sizes and glazing spec vary the price, so confirm with the supplier.
- Flat roof: warm-deck construction with 120mm PIR, 47×195 C24 joists at 400 centres with firrings to fall, epdm rubber roof membrane with adhesives & trims.
- Drainage: rainwater and any foul water connected to the existing system within 6m, capacity assumed adequate. Building over or near an existing sewer needs the water company's agreement.
- 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.
Materials — 53 lines (measured → with waste → purchased)
| Item | Measured | + waste | Buy | Unit price | Cost | Price status |
|---|---|---|---|---|---|---|
| Alloy tower scaffold hire per week access equipment · from access | 3 wk | 3 | 3 × week | £150.00 | £450.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Underground drainage bend 110mm drainage · from drainage | 3 nr | 3 | 3 × each | £6.00 | £18.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Underground drainage pipe 110mm × 3m drainage · from drainage | 6 m | 6.60 | 3 × length | £14.00 | £42.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Bottle gully 110mm drainage · from drainage | 1 nr | 1 | 1 × each | £22.00 | £22.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Inspection chamber 450mm kit with cover drainage · from drainage | 1 nr | 1 | 1 × kit | £120.00 | £120.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Pea gravel 10mm drainage · from drainage | 0.60 m3 | 0.66 | 2 × bulk bag | £52.00 | £104.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| LED downlight (fire-rated, dimmable) electrical · from electrics | 2 nr | 2 | 2 × each | £9.00 | £18.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Socket/switch point: faceplate, back box, cable share electrical · from electrics | 4 nr | 4 | 4 × each | £22.00 | £88.00 | 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 |
| Concrete block 100mm 7.3N excavation foundations · from below-dpc, dwarf-wall | 165 nr | 173.3 | 3 × pack of 72 | £130.00 | £390.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Ready-mix concrete GEN1 (foundations) excavation foundations · from foundations | 4.62 m3 | 4.85 | 20 × m³ (0.25 m³ steps) | £32.50 | £650.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Roof lantern 2000×1000 aluminium external openings · from flat-roof | 1 nr | 1 | 1 × each | £1,600.00 | £1,600.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Building sand external walls · from below-dpc, dwarf-wall | 0.44 m3 | 0.48 | 1 × bulk bag | £52.00 | £52.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Full-fill cavity insulation 100mm external walls · from dwarf-wall | 6.60 m2 | 7.09 | 2 × pack | £30.00 | £60.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| DPC 100mm × 30m external walls · from dwarf-wall | 22 m | 25.3 | 1 × roll | £9.00 | £9.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Facing brick (standard 65mm) external walls · from dwarf-wall | 396 nr | 415.8 | 1 × pack of 500 | £300.00 | £300.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Stainless wall ties 225mm external walls · from dwarf-wall | 19.8 nr | 19.8 | 1 × box of 250 | £35.00 | £35.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Cement 25kg floors · from below-dpc, screed, dwarf-wall | 10.7 bag | 11.4 | 12 × bag | £6.50 | £78.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Damp-proof membrane 1200 gauge 4m × 25m floors · from slab | 12.9 m2 | 14.9 | 1 × roll | £45.00 | £45.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| MOT Type 1 sub-base 150mm compacted floors · from slab | 2.52 m3 | 2.77 | 6 × bulk bag | £48.00 | £288.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Reinforcement mesh A142 4.8m × 2.4m floors · from slab | 12.9 m2 | 14.9 | 2 × sheet | £32.00 | £64.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| PIR floor insulation 100mm floors · from slab | 12.9 m2 | 13.9 | 5 × sheet | £38.00 | £190.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Ready-mix concrete GEN3 100mm slab floors · from slab | 1.29 m3 | 1.36 | 6 × m³ (0.25 m³ steps) | £35.00 | £210.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Sharp sand floors · from slab, screed | 1.57 m3 | 1.68 | 4 × bulk bag | £55.00 | £220.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Drywall adhesive 25kg (dot and dab) insulation linings · from linings | 25.3 m2 | 26.6 | 9 × bag | £8.00 | £72.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Drywall screws 38mm box of 1000 insulation linings · from ceiling | 387.6 nr | 387.6 | 1 × box | £12.00 | £12.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Plasterboard 12.5mm 2400×1200 insulation linings · from linings, ceiling | 38.2 m2 | 42.0 | 15 × sheet | £8.50 | £127.50 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Porcelain floor tiles with adhesive & grout internal finishes · from flooring | 12.9 m2 | 14.0 | 14 × m² | £36.00 | £504.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| MDF skirting 145mm × 4.4m internal finishes · from skirting | 14.4 m | 15.8 | 4 × length | £12.00 | £48.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| 1t dumper hire per day plant · from foundations | 1 day | 1 | 1 × day | £70.00 | £70.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| 1.5t mini digger hire per day plant · from foundations | 1 day | 1 | 1 × day | £95.00 | £95.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Cement mixer hire per week plant · from prelims | 3 wk | 3 | 3 × week | £45.00 | £135.00 | 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 |
| 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 | 3 wk | 3 | 3 × week | £30.00 | £90.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Flat roof joists C24 47×195 @ 400 centres roof · from flat-roof | 47.1 m | 51.9 | 52 × m | £4.60 | £239.20 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| uPVC downpipe 68mm × 2.5m with clips & shoe roof · from flat-roof | 2 nr | 2 | 2 × each | £18.00 | £36.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| EPDM rubber roof membrane with adhesives & trims roof · from flat-roof | 20.7 m2 | 23.9 | 24 × m² | £16.00 | £384.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| uPVC fascia board 175mm × 5m roof · from flat-roof | 13.4 m | 14.7 | 3 × length | £32.00 | £96.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Firring strips (tapered) per m roof · from flat-roof | 47.1 m | 51.9 | 52 × m | £2.00 | £104.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Lead/lead-free abutment flashing with cavity tray per m roof · from flat-roof | 4 m | 4 | 4 × m | £28.00 | £112.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| uPVC half-round gutter 112mm × 4m roof · from flat-roof | 13.4 m | 14.7 | 4 × length | £14.00 | £56.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Gutter bracket roof · from flat-roof | 13.4 nr | 13.4 | 14 × each | £1.30 | £18.20 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Gutter fittings (outlet, stop ends, unions) per run roof · from flat-roof | 2 nr | 2 | 2 × set | £25.00 | £50.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| OSB3 18mm 2440×1220 roof · from flat-roof | 37.7 m2 | 41.5 | 14 × sheet | £28.00 | £392.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Warm roof PIR insulation 120mm roof · from flat-roof | 18.9 m2 | 20.3 | 8 × sheet | £45.00 | £360.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| uPVC soffit board 300mm × 5m roof · from flat-roof | 13.4 m | 14.7 | 3 × length | £30.00 | £90.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Vapour control layer 50m² roof · from flat-roof | 18.9 m2 | 21.7 | 1 × roll | £42.00 | £42.00 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Wall plate 100×50 treated roof · from flat-roof | 15 m | 16.5 | 17 × m | £2.40 | £40.80 | Catalogue allowance BuildLegend catalogue · 2026-09-24 |
| Muck-away of excavated spoil (grab lorry) waste · from foundations | 3 nr | 3 | 3 × load | £380.00 | £1,140.00 | 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 — 26 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 | 10.1 m3 | 12 | 24 | 1× groundworker @ £30.00/hr + 1× labourer @ £30.00/hr blended | £720.00 |
| Place and level foundation concrete Groundworker · 0.80 h/m3 · min 4h | 4.62 m3 | 4 | 8 | 2× groundworker @ £30.00/hr blended | £240.00 |
| Blockwork below DPC Bricklayer · 0.70 h/m2 | 9.90 m2 | 6.93 | 10.4 | 1× bricklayer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £311.85 |
| Hardcore, blind, DPM, insulation, mesh and pour slab Groundworker · 1.20 h/m2 · min 8h | 12.9 m2 | 15.5 | 31 | 2× groundworker @ £30.00/hr blended | £930.00 |
| Lay 65mm sand/cement screed Plasterer · 0.40 h/m2 · min 4h | 12.9 m2 | 5.17 | 10.34 | 1× plasterer @ £30.00/hr + 1× labourer @ £30.00/hr blended | £310.20 |
| Facing brickwork outer skin Bricklayer · 1.20 h/m2 · min 8h | 6.60 m2 | 8 | 12 | 1× bricklayer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £360.00 |
| Blockwork inner skin Bricklayer · 0.70 h/m2 · min 8h | 6.60 m2 | 8 | 12 | 1× bricklayer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £360.00 |
| Wall ties, cavity insulation and closers Bricklayer · 0.10 h/m2 | 6.60 m2 | 0.66 | 0.66 | 1× bricklayer @ £30.00/hr blended | £19.80 |
| Fit glazed frames on dwarf wall Carpenter / joiner · 1.20 h/m · min 8h | 11 m | 13.2 | 26.4 | 2× carpenter / joiner @ £30.00/hr blended | £792.00 |
| Flat roof joists, firrings and deck Carpenter / joiner · 0.90 h/m2 · min 8h | 18.9 m2 | 16.97 | 33.94 | 2× carpenter / joiner @ £30.00/hr blended | £1,018.20 |
| Vapour control layer, insulation and upper deck Carpenter / joiner · 0.30 h/m2 | 18.9 m2 | 5.66 | 11.32 | 2× carpenter / joiner @ £30.00/hr blended | £339.60 |
| Lay epdm rubber roof membrane with adhesives & trims Roofer · 0.50 h/m2 · min 6h | 18.9 m2 | 9.43 | 18.86 | 2× roofer @ £30.00/hr blended | £565.80 |
| Fascia, soffit, guttering and downpipes Carpenter / joiner · 0.50 h/m · min 4h | 13.4 m | 6.7 | 10.05 | 1× carpenter / joiner @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £301.50 |
| Form upstand and fit roof lantern Carpenter / joiner · 8.00 h/nr | 1 nr | 8 | 16 | 2× carpenter / joiner @ £30.00/hr blended | £480.00 |
| Excavate, lay and backfill drainage run to the existing system Groundworker · 1.00 h/m · min 6h | 6 m | 6 | 12 | 2× groundworker @ £30.00/hr blended | £360.00 |
| Install inspection chamber and connect to existing drain Groundworker · 4.00 h/nr | 1 nr | 4 | 8 | 2× groundworker @ £30.00/hr blended | £240.00 |
| 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 |
| 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 | 25.3 m2 | 11.39 | 17.09 | 1× plasterer @ £30.00/hr + 0.5× labourer @ £30.00/hr blended | £512.55 |
| Board ceiling Plasterer · 0.55 h/m2 · min 4h | 12.9 m2 | 7.11 | 14.22 | 1× plasterer @ £30.00/hr + 1× labourer @ £30.00/hr blended | £426.60 |
| Fix skirting Carpenter / joiner · 0.30 h/m · min 2h | 14.4 m | 4.32 | 4.32 | 1× carpenter / joiner @ £30.00/hr blended | £129.60 |
| Lay porcelain floor tiles Specialist subcontractor · 1.20 h/m2 · min 4h | 12.9 m2 | 15.5 | 15.5 | 1× specialist subcontractor @ £30.00/hr blended | £465.00 |
| 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 |
|---|---|---|---|---|---|---|
| Orangery | 12.92 | 11.00 | 25.30 | 18.86 | 13.40 | 11.00 |