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Loft Conversion Price Guide

Location: London (Zones 5–8), North-West London

Typical Market Price (North-West London) – August 2026

£86,400 (including VAT)

Our Fixed Price - £71,800 (including VAT) – August 2026

Cost Breakdown Price

Materials £24,300

Labour £39,900

Scaffolding £5,800

Waste removal £1,800

Total £71,800

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Loft Conversion Scope of Works

Typical Property 

  • Mid-terraced house

  • Existing footprint: 6.0m × 8.0m

  • Roof pitch: 30–40°

  • Loft head height: 2.7m+

Proposed Accommodation

  • Rear dormer loft conversion

  • One bedroom

  • One shower room

  • New staircase (two winders)

  • 2 front roof windows

  • Rear dormer windows:

    • Bedroom: 1.2 × 1.2m

    • Bathroom: 0.6 × 0.9m

Scope of Works

Preliminary Works

  • Site setup

  • Welfare facilities

  • Dust protection

  • Full scaffolding

  • Temporary weatherproof canopy

  • Skip hire and waste removal

Structural Works

  • Structural calculations

  • Install 5 structural steel beams

  • New floor joists

  • New structural timber

  • Dormer construction

  • Roof strengthening

Roofing

  • Remove existing roof covering as required

  • New Redland 49 concrete roof tiles to pitched roof

  • New breathable membrane

  • New treated battens

  • New lead flashings

  • GRP fibreglass flat roof to dormer

  • Fascias, soffits and rainwater goods

Windows

  • 2 front roof pivotal windows

  • Dormer bedroom window

  • Dormer bathroom window

  • Flashings

  • Installation

Staircase

  • Bespoke timber staircase

  • Two winders

  • Handrails

  • Balustrades

  • Trim works

(Client supplies internal doors only.)

Insulation

Kingspan PIR insulation

  • Roof: 150mm

  • Front roof: 150mm

  • Dormer walls: 100mm

  • Floor acoustic insulation

  • Vapour barriers

Internal Construction

  • Timber stud walls

  • Fire-rated plasterboard

  • Skim plaster finish

  • Boxing-in services

Bathroom Installation

Includes

  • Pipework

  • Waste connections

  • Shower tray installation

  • Basin installation

  • WC installation

  • Extract fan

  • Electrical towel rail

  • Waterproofing

  • Client supplies:

    • sanitaryware

    • shower enclosure

    • wall tiles

    • towel rail

Plumbing & Heating

  • Extend heating circuit

  • Install one radiator

  • Hot and cold water services

  • Soil and waste connections

Electrical

Includes

  • First fix

  • Second fix

  • Consumer unit connection (where suitable)

  • Spotlights installation

  • Switches

  • Smoke alarms

  • Extractor fan

  • Electrical Installation Certificate

(Client supplies light fittings.)

Carpentry

Includes

  • Floor T&G boards installation

  • Door installation

  • Skirting

  • Architraves

  • Window boards

  • Ironmongery fitting

(Client supplies doors and ironmongery.)

Decoration

  • Mist coat

  • Two finish coats to walls and ceilings

  • Gloss/satin to woodwork

Final Works

  • Building Control inspections

  • Snagging

  • Professional clean

Exclusions

  • Final flooring

  • Upgrading the existing consumer unit if required

  • Boiler replacement or heating system upgrades

  • Asbestos removal

  • Unexpected structural repairs

  • Decorations below the new staircase opening

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