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FOR UK CONTRACTORS

Priced estimates from someone who's run the jobs, not just priced them.

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Step 01

Send your drawings
Email or upload your drawings, plans or sketches - whatever you have. Tell us your tender deadline. We take it from there, so you can get back to running your jobs.

Step 02

We Price It
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Step 03

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Scroll inside to browse the full estimate ↓
CONSTRUCTION ESTIMATE

Single Storey Rear Extension

14 Oakfield Road, London SW00 0AA
Prepared forMr & Mrs Sample
Prepared byMy Project Estimating
ReferenceMPE-2026-014
Date4 July 2026
Valid for90 days from date of issue
£128,788.03 excluding VAT

Contents

  1. 1. Executive Summary
  2. 2. Basis of Estimate
  3. 3. Drawings & Information Relied Upon
  4. 4. Pricing Summary by Stage
  5. 5. Preliminaries
  6. 6. Detailed Stage Breakdown
  7. 7. PC Sums & Provisional Sums
  8. 8. Value Engineering Options
  9. 9. Assumptions
  10. 10. Exclusions
  11. 11. Qualifications & Site Verification
  12. 12. Stage Payment Schedule
  13. 13. Next Steps
  14. 14. Standard Terms

1Executive Summary

This report sets out our estimate for the construction of a single storey rear extension at 14 Oakfield Road, London SW00 0AA, providing approximately 42 m² additional floor area. It has been prepared for Mr & Mrs Sample on the basis of the drawings and information listed in Section 2.

Net works£113,971.70
Net total (incl. OH&P + contingency)£128,788.03
Total incl. VAT£154,545.64

The net total of £128,788.03 includes overheads and profit at 8% and a construction contingency at 5%. With VAT at 20%, the total is £154,545.64.

The estimate carries PC and provisional sums totalling £27,414.00 for items not yet finally selected (Section 7). We have also set out value engineering options in Section 8 that could reduce the cost by up to £7,150.00 if adopted.

This is an estimate rather than a fixed-price tender. It should be read together with the assumptions, exclusions and qualifications, which define exactly what is and is not included. All dimensions must be verified on site before ordering or starting work.

Key figure: £128,788.03 net  /  £154,545.64 including VAT. Valid 90 days.

2Basis of Estimate

This estimate has been prepared on the following basis. Where information was not available, a reasonable allowance has been made and identified as a PC or provisional sum.

ProjectSingle Storey Rear Extension, 42 m² additional floor area
Location14 Oakfield Road, London SW00 0AA
ScopeConstruction of the extension including groundworks, structure, roof, external envelope, first and second fix, finishes, kitchen and sanitaryware installation, and associated external works.
MeasurementQuantities measured from the listed drawings in accordance with NRM2 principles.
PricingCurrent UK market labour and material rates at the date of issue.
ProgrammeSingle continuous build assumed. No allowance for phasing or accelerated working.
ContractAssumed a standard domestic building contract. Not yet agreed.

If any of the above changes, in particular a drawing revision or a change of specification, the estimate should be revisited.

3Drawings & Information Relied Upon

This estimate is based on the following drawings and their revisions. Pricing relates to these revisions only. A later revision may change quantities and cost.

DrawingTitleRevOriginator
A-100Existing plans and elevationsRev CSample Architects Ltd
A-101Proposed ground floor planRev DSample Architects Ltd
A-102Proposed elevations and sectionRev DSample Architects Ltd
A-200Proposed roof planRev BSample Architects Ltd
S-01Structural layout and beam scheduleRev BConsulting Structural Engineer
S-02Foundation detailsRev AConsulting Structural Engineer
Important: all dimensions shown on these drawings must be confirmed on site before any materials are ordered or works commence. Figured dimensions take precedence over scaled dimensions in all cases.

4Pricing Summary by Stage

The table below summarises the net cost of each stage of the works, excluding VAT. Preliminaries are shown in Section 5 and a full breakdown of every stage follows in Section 6.

StageNet (excl. VAT)
Preliminaries£17,640.00
Groundworks & Foundations£10,452.40
Superstructure & Walls£21,350.00
Roofing£9,976.00
Windows & External Doors£8,020.00
First Fix M&E£6,478.00
Internal Finishes£15,585.30
Kitchen & Sanitaryware£17,550.00
External Works£6,920.00
Net works£113,971.70
Overheads & profit @ 8%£9,117.74
Construction contingency @ 5%£5,698.59
Net total (excl. VAT)£128,788.03
VAT @ 20%£25,757.61
Total including VAT£154,545.64

5Preliminaries

Preliminaries cover the cost of running the project that is not tied to a single trade, site set-up, management, access, welfare, temporary works and general attendance. They are listed as items and priced for a build of this size and duration.

ItemQtyUnitRateNet
Site set-up, welfare unit and temporary fencing1item£2,850.00£2,850.00
Scaffolding to rear elevation, 12 week hire1item£3,420.00£3,420.00
Skip hire and waste removal, 6 x 8yd6each£285.00£1,710.00
Site management and supervision12week£640.00£7,680.00
Temporary services, protection and general attendance1item£1,980.00£1,980.00
Total preliminaries£17,640.00

Preliminaries are time-related. A longer programme, or a stop-start programme, would increase this figure.

6Detailed Stage Breakdown

Each stage is broken down into its works. Under every work, costs are grouped into materials, labour and plant. Rates are net of VAT and reflect current UK market prices.

Groundworks & Foundations£10,452.40
Excavation & Disposal£3,516.80
DescriptionQtyUnitRateNet
Labour
Reduce level dig and cart away spoil38m3£46.50£1,767.00
Excavate for trench fill foundations22.4m3£52.00£1,164.80
Plant
3 Tonne excavator hire3day£195.00£585.00
Foundations & Floor Slab£6,935.60
DescriptionQtyUnitRateNet
Material
Ready-mix C25 concrete22.4m3£142.00£3,180.80
Sand blinding and 1200g DPM42m2£9.80£411.60
100mm PIR floor insulation42m2£21.40£898.80
Labour
Pour foundations, lay and power-float slab42m2£58.20£2,444.40
Superstructure & Walls£21,350.00
External Cavity Walls£15,408.00
DescriptionQtyUnitRateNet
Material
Facing brick, block and cavity materials78m2£118.00£9,204.00
Facing bricks to match existing (PC allowance)3.21000£720.00£2,304.00
Labour
Bricklaying and blockwork to cavity wall78m2£50.00£3,900.00
Structural Openings£4,330.00
DescriptionQtyUnitRateNet
Material
Steel beam to rear opening1item£1,650.00£1,650.00
Labour
Install steel, padstones and make good1item£2,680.00£2,680.00
Internal Partitions£1,612.00
DescriptionQtyUnitRateNet
Material
Blockwork and ties26m2£24.00£624.00
Labour
Build internal partitions26m2£38.00£988.00
Roofing£9,976.00
Flat Roof Structure£2,520.00
DescriptionQtyUnitRateNet
Material
Firrings, joists and 18mm deck42m2£34.00£1,428.00
Labour
Construct flat roof structure42m2£26.00£1,092.00
Roof Insulation£1,596.00
DescriptionQtyUnitRateNet
Material
150mm PIR warm roof insulation42m2£28.50£1,197.00
Labour
Lay and fix insulation boards42m2£9.50£399.00
Roof Covering£1,680.00
DescriptionQtyUnitRateNet
Material
Single-ply membrane and trims42m2£22.00£924.00
Labour
Install single-ply covering and detailing42m2£18.00£756.00
Rooflights & Rainwater£4,180.00
DescriptionQtyUnitRateNet
Material
Rooflights, 2 no. (PC allowance)2each£1,250.00£2,500.00
Fascia, soffit and rainwater goods1item£980.00£980.00
Labour
Install rooflights and rainwater goods1item£700.00£700.00
Windows & External Doors£8,020.00
Bi-fold Doors£4,680.00
DescriptionQtyUnitRateNet
Material
Aluminium bi-fold doors, 3.6m (PC allowance)1each£4,200.00£4,200.00
Labour
Install bi-fold door set and make good1each£480.00£480.00
Windows£3,340.00
DescriptionQtyUnitRateNet
Material
Double glazed windows, 4 no. (PC allowance)4each£680.00£2,720.00
Labour
Install windows and make good4each£155.00£620.00
First Fix M&E£6,478.00
Electrical First Fix£2,450.00
DescriptionQtyUnitRateNet
Labour
First fix electrics to extension1item£2,450.00£2,450.00
Plumbing & Heating First Fix£2,180.00
DescriptionQtyUnitRateNet
Labour
First fix plumbing and heating, 3 radiators1item£2,180.00£2,180.00
Underfloor Heating£1,848.00
DescriptionQtyUnitRateNet
Material
Underfloor heating kit42m2£18.00£756.00
Labour
Install underfloor heating42m2£26.00£1,092.00
Internal Finishes£15,585.30
Plastering & Screeding£6,921.30
DescriptionQtyUnitRateNet
Material
Plasterboard, skim and screed materials1item£2,400.00£2,400.00
Labour
Plaster, skim and screed210m2£21.53£4,521.30
Floor Finishes£2,814.00
DescriptionQtyUnitRateNet
Material
Floor finish supply (PC allowance)42m2£45.00£1,890.00
Labour
Prepare and lay floor finish42m2£22.00£924.00
Decoration & Second Fix Joinery£5,850.00
DescriptionQtyUnitRateNet
Labour
Painting and decorating throughout1item£3,200.00£3,200.00
Second fix joinery, skirting and architrave1item£2,650.00£2,650.00
Kitchen & Sanitaryware£17,550.00
Kitchen£14,400.00
DescriptionQtyUnitRateNet
Material
Kitchen units and worktops (PC sum)1sum£12,000.00£12,000.00
Labour
Install kitchen and connect appliances1item£2,400.00£2,400.00
Sanitaryware£3,150.00
DescriptionQtyUnitRateNet
Material
Sanitaryware to WC (PC sum)1sum£1,800.00£1,800.00
Labour
Second fix plumbing and sanitaryware1item£1,350.00£1,350.00
External Works£6,920.00
Patio & Landscaping£3,850.00
DescriptionQtyUnitRateNet
Labour
Rebuild patio and level rear garden1item£3,850.00£3,850.00
Drainage£1,420.00
DescriptionQtyUnitRateNet
Labour
Drainage connections and gullies1item£1,420.00£1,420.00
Making Good£1,650.00
DescriptionQtyUnitRateNet
Labour
Make good at junction with existing house1item£1,650.00£1,650.00

7PC Sums & Provisional Sums

The items below are allowances, not fixed prices. A Prime Cost (PC) sum is money set aside for materials or fittings not yet finally selected. A provisional sum is money set aside for work that cannot yet be precisely measured. Each is reconciled against the actual cost once selections and details are confirmed.

ItemTypeAllowance (excl. VAT)
Facing bricks to match existingPC Sum£2,304.00
Rooflights (2 no.)PC Sum£2,500.00
Aluminium bi-fold doors, 3.6mPC Sum£4,200.00
Windows to extension (4 no.)PC Sum£2,720.00
Floor finish supplyPC Sum£1,890.00
Kitchen units and worktopsPC Sum£12,000.00
Sanitaryware to WCPC Sum£1,800.00
Total allowances£27,414.00
These allowances are already included within the stage prices and the totals in Section 4. They are listed here so you can see exactly which items are still to be confirmed. Final cost may be higher or lower depending on your selections.

8Value Engineering Options

The following options could reduce the cost without changing the size or layout of the extension. They are optional. Each shows the saving against the net total and a short note on the trade-off. We are happy to talk any of them through.

OptionAreaSaving
Single-ply membrane roof to a high-performance felt system
Reduces roof cost with a proven felt build-up. Slightly shorter guarantee period.
Roofing−£1,260.00
Aluminium bi-fold to uPVC French doors with side lights
Lower-cost door set. Reduces the opening's slimline appearance.
Windows−£2,350.00
Porcelain floor tiles to engineered timber / LVT
Alternative floor finish at a lower supply rate. Subject to selection.
Finishes−£840.00
Standard rooflights to fixed frameless units
Fixed instead of opening rooflights. Loses ventilation via the roof.
Roofing−£700.00
Client-supplied kitchen (trade discount retained by client)
Client procures kitchen directly. MPE installs only. Removes our PC margin.
Kitchen−£2,000.00
Maximum saving if all options adopted−£7,150.00
Net total as estimated: £128,788.03, with all options: £121,638.03 (excl. VAT)

9Assumptions

This estimate is prepared on the following assumptions. If any prove incorrect, the price may change.

  • Pricing is based on the drawings and revisions listed in the Basis of Estimate. Any subsequent revision may change the price.
  • Works are assumed to proceed continuously, with clear and uninterrupted access to the rear of the property throughout.
  • Existing foundations, drains and services are assumed sound and in the positions indicated. Any diversions are excluded.
  • Ground is assumed to be firm and free from rock, running water, contamination or made ground. Standard trench-fill depths assumed.
  • Existing walls where the extension connects are assumed sound and suitable to be built off and made good.
  • Mains water, drainage and electricity are available at the property and of adequate capacity.
  • All PC and provisional sums are allowances only and will be reconciled against actual selections and costs.
  • Working hours are standard weekday hours. No allowance is made for weekend, night or accelerated working.

10Exclusions

The following are not included in this estimate. If any are required, they can be priced separately on request.

  • VAT reliefs or zero-rating (priced at standard rate unless confirmed otherwise)
  • Party wall awards, surveyor fees and any associated works
  • Planning fees, building control fees and statutory charges
  • Architect, structural engineer and other consultant fees
  • Asbestos survey, removal or licensed disposal
  • Removal of unforeseen obstructions, rock, contaminated or made ground
  • Diversion or upgrade of existing incoming services and meters
  • Tree removal, root protection measures and arboricultural works
  • Landscaping and planting beyond the patio and levelling stated
  • Loose furniture, white goods and appliances (unless within a stated PC sum)
  • Works to the existing house beyond making good at the junction with the extension
  • Temporary alternative accommodation for the client during the works

11Qualifications & Site Verification

This estimate is issued subject to the following qualifications.

  • All dimensions and quantities are taken from the drawings listed and MUST be verified on site before any materials are ordered or works commence.
  • This is an estimate, not a fixed-price tender. Final cost is subject to confirmed selections, site conditions and any design development.
  • Where a specification is not yet fixed, a reasonable allowance has been made and flagged as a PC or provisional sum.
  • Structural elements are priced to the engineer's current design. Any change following building control review may affect the price.
  • The estimate assumes a single continuous build programme. A phased or stop-start programme would be repriced.
  • Prices are held for the validity period stated on the cover. Beyond that, material prices in particular are subject to review.
All dimensions and quantities are taken from drawings and MUST be verified on site before any materials are ordered or works commence. Figured dimensions take precedence over scaled dimensions.

12Stage Payment Schedule

On acceptance we would propose the following stage payments, each due on completion of the stage and against a valuation. Percentages are of the net total (excl. VAT). VAT is added to each payment.

Stage%Net amount
Mobilisation / deposit on acceptance10%£12,878.80
Groundworks and foundations complete20%£25,757.61
Superstructure and roof watertight25%£32,197.01
First fix M&E and plastering complete20%£25,757.61
Second fix, kitchen and finishes complete20%£25,757.61
Practical completion and snagging signed off5%£6,439.40
Net total100%£128,788.03

This is an indicative schedule for discussion. Final stage payments are agreed and set out in the building contract.

13Next Steps

To move this forward:

  1. Review this estimate and the assumptions, exclusions and qualifications in full.
  2. Confirm any PC and provisional sum selections so those allowances can be firmed up.
  3. Let us know which, if any, value engineering options you would like us to apply.
  4. On acceptance, we issue a contract sum, programme and a stage payment schedule.
  5. Contact us with any queries and we will be happy to talk them through.

We look forward to hearing from you.

My Project Estimating
info@myprojectestimating.co.uk  •  020 3576 2913
myprojectestimating.co.uk

14Standard Terms

This estimate is issued on the following terms. It is an estimate of likely cost based on the information available at the date of issue and is not a fixed-price tender or an offer to contract. Prices are held for 90 days from the date of issue, after which they are subject to review, in particular material prices. Quantities are measured from the drawings listed and must be verified on site before ordering or commencing works. PC and provisional sums are allowances only and are reconciled against actual cost. The assumptions, exclusions and qualifications in this report form part of the estimate and define its scope. No liability is accepted for matters outside the stated scope or for changes arising from revised information, site conditions or design development. Any contract arising will be documented separately and will take precedence over this estimate.

My Project Estimating  •  4th Floor, Silverstream House, 45 Fitzroy St, London W1T 6EB
Company No. 11255002
info@myprojectestimating.co.uk  •  myprojectestimating.co.uk
What You Receive

Every estimate comes as a complete, editable document – in PDF, Word and Excel. Everything you need to bid the job or hand it to your client, broken down and easy to read.

Cover Page

Your project title, address, and company details presented in a clean, professional layout.

A short covering letter you can send straight to your client with the estimate.

The headline numbers – net, VAT and total – with each stage summarised so the price is clear at a glance.

Every element measured and priced, grouped into materials, labour and plant, so you see exactly where the cost sits.

A clean, itemised BoQ measured to NRM2, ready for tender or to price against.

Site set-up, management, access and temporary works, priced separately so nothing is hidden in the rates.

Allowances for items not yet selected, listed clearly so you know what’s still to be confirmed.

A suggested stage payment schedule you can use to agree terms with your client.

Send your drawings

Send Us Your Drawings

Send your drawings or project details and we’ll get straight to work on your estimate. Full measured takeoff, priced on real UK rates, delivered to your tender deadline. Built for contractors and subcontractors who need numbers they can bid from.

Who We Work With

Estimating built around how contractors work

 We price for the people who bid and build the work, not the ones who commission it.

My Project Estimating
Main Contractors

Full measured takeoffs and priced estimates so you bid competitively without giving away your margin. Numbers you can submit with confidence.

Subcontractors

Your package measured and priced from the drawings, so you tender your trade accurately and don’t get caught short on site.

Small & Medium Builders

No QS in the office? We are your estimating team. Send the drawings, get back to running the job, and we’ll have your estimate ready.

Trades

Pricing a job for a client? We turn your drawings into a clean, itemised estimate you can hand over and win the work with.

Common Questions

Most Popular Questions.

Picking someone to price your job is a big call, so you’ll have questions. Here are the ones contractors ask us most, covering how we work, what’s included and how fast you’ll get your estimate. Can’t see what you need? Contact us and we’ll answer it straight.

A full measured takeoff and priced estimate, broken down into materials, labour, plant and preliminaries, with PC and provisional sums flagged. You get it as an editable document in PDF, Word and Excel, ready to bid from or hand to your client.

Standard turnaround is a few working days, depending on the size of the job. If you're up against a tight tender deadline, ask about our express service and we'll work to it.

No QS needed, that's what we're for. Just send whatever drawings, plans or sketches you have, tell us your deadline, and we'll take it from there.

A clean, itemised document in PDF, Word and Excel. Easy to read, easy to edit, and ready to drop straight into your bid or send to your client.

Every element is measured from your drawings to NRM2 and priced on current UK rates, so nothing's missed and nothing's padded. It's an estimate, not a fixed-price tender, so final cost depends on confirmed selections and site conditions, but you get numbers you can bid on with confidence.