Trade-by-Trade Breakdown

Build Cost Estimator

Itemised construction costs by trade. Regional adjustments. Three quality tiers. Know what every part of your build should cost.

Project Type

Specifications

Include

Kitchens
Bathrooms & En-suites
Windows & External Doors
External Works

Total Build Cost

£158,400

Cost / sqft

£132

Cost / Unit

£26,400

Midlands·Regional factor: 1x
£132/sqft — Industry benchmark for HMO Conversion in Midlands: £55–£140/sqft

Cost Split by Category

Structure£26,400
Services£37,800
Finishes£28,800
Fit-Out£21,600
External£18,000
Fees£11,400

Itemised Trade Breakdown

Structure

£26,400

Demolition & Strip Out

Soft strip, removal of existing fittings, skips, waste disposal

£4,800

£4/sqft · 3.3%

Structural Works

Steel beams, load-bearing walls, lintels, structural openings

£14,400

£12/sqft · 10%

Partition Walls

Stud walls, soundproofing, fire barriers between units

£7,200

£6/sqft · 5%

Services

£37,800

Plumbing & Heating

Hot/cold water, central heating, boiler, radiators, underfloor heating

£15,600

£13/sqft · 10.8%

Electrical First & Second Fix

Consumer unit, wiring, sockets, switches, lighting, testing

£12,000

£10/sqft · 8.3%

Fire Alarm & Detection

LD2/LD3 system, smoke/heat detectors, alarm panel, emergency lighting

£3,600

£3/sqft · 2.5%

Ventilation & Extraction

MVHR, bathroom fans, kitchen extraction, ductwork

£3,600

£3/sqft · 2.5%

Gas Installation

Gas supply, meter, pipework, safety certificates

£3,000

£2.5/sqft · 2.1%

Finishes

£28,800

Plastering & Rendering

Skim coat, dot & dab, external render, drylining

£7,200

£6/sqft · 5%

Decoration

Painting, wallpaper, feature walls, coving

£4,800

£4/sqft · 3.3%

Flooring

Laminate, LVT, carpet, tiling, engineered wood

£7,200

£6/sqft · 5%

Tiling (walls)

Kitchen splashbacks, bathroom walls, en-suite tiling

£4,800

£4/sqft · 3.3%

Internal Doors & Ironmongery

Fire doors (FD30), handles, locks, closers, frames

£4,800

£4/sqft · 3.3%

Fit-Out

£21,600

Kitchens

Units, worktop, sink, taps, splashback, appliances (hob, oven, extractor)

£12,000

£10/sqft · 8.3%

Bathrooms & En-suites

Suite (WC, basin, bath/shower), screen, taps, accessories, tiling

£9,600

£8/sqft · 6.7%

External

£18,000

Windows & External Doors

Double/triple glazed windows, front door, patio doors

£10,800

£9/sqft · 7.5%

External Works

Landscaping, fencing, driveway, drainage, bin stores, bike storage

£7,200

£6/sqft · 5%

Professional Fees

£11,400

Architect / Designer

Design, planning drawings, building regs drawings

£3,600

£3/sqft · 2.5%

Structural Engineer

Structural calculations, beam sizing, inspections

£1,440

£1.2/sqft · 1%

Building Control

Building regs application, inspections, completion certificate

£960

£0.8/sqft · 0.7%

Planning Fees

Planning application, CIL/S106 if applicable

£1,200

£1/sqft · 0.8%

Project Management

Site management, contractor coordination, quality control

£4,200

£3.5/sqft · 2.9%

Build subtotal£144,000
Contingency (10%)£14,400
Total Build Cost£158,400
Benchmarked against RICS regional data. 28 trades, 6 categories, 11 regions.

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Contractor rates

Local avg.

Material costs

Q1 2026

Estimate only — Costs are based on industry benchmarks and regional averages. Actual costs vary by site conditions, contractor availability, specification choices, and market conditions. Always obtain formal quotes. This is not financial advice.