What is the average cost of a 100 m² full refurbishment?

Comprehensive refurbishments for a 100 m² home typically range from £150,000 to £280,000 (excluding VAT) depending on structural alterations, specification and property condition.

How long does a whole-house refurbishment project take?

Most whole-home refurbishments take 16–28 weeks, split across strip-out, structure, first fix, finishes and snagging. Larger structural changes or bespoke joinery can extend schedules.

Do I need planning permission for a refurbishment?

Internal refurbishments often proceed without planning permission, but external alterations, conservation areas or structural amendments may require planning approval and Building Control oversight.

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How much does a builder cost on a refurbishment project?

Builder stages for your refurbishment project

Please note that these are rough guides only. To get a clear cost breakdown of each stage for your refurbishment project, please post your project and get up to 5 free quotes

Remodelling / Renovation Project

Once your plans and specifications are finalised, your builder takes the lead on-site — carefully transforming your home while maintaining safety, quality, and minimal disruption to daily life.

Pre-Start & Planning

Confirm the scope, schedule, and responsibilities

Site Setup & Protection

Prepare the live home for safe refurbishment works

Strip-Out & Demolition

Create the blank canvas for your new layout

Structural Alterations

Form new openings and reinforce the structure

First Fix Services

Install the hidden services that power your home

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How does a builder work on a refurbishment project?

Builder step-by-step cost guide for your refurbishment/renovation project.

(Please note that these are rough guides only; to get a refurbishment cost breakdown of each stage, please post your project and get up to 5 free quotes.)

Builder Cost Breakdown – Typical Remodelling / Refurbishment / Renovation Project

All figures are rough guides only and vary by location, design complexity, and specification. Based on 2025 averages, excluding VAT.

Typical overall cost: £1,500 – £2,800+ per m²

Example: 100 m² full house refurbishment ≈ £150,000 – £280,000

Pre-Start & Site Setup

2–5%

Approx. cost: £3,000 – £10,000

Strip-Out, Demolition & Structural Alterations

10–20%

Approx. cost: £15,000 – £40,000+

External Repairs & Fabric Upgrades

10–15%

Approx. cost: £15,000 – £30,000

First Fix Services (Mechanical, Electrical & Plumbing)

10–15%

Approx. cost: £15,000 – £30,000

Internal Walls, Plastering & Finishes

8–12%

Approx. cost: £12,000 – £25,000

Builder stages for your refurbishment project

Pre-Start & Planning

Site Setup & Protection

Strip-Out & Demolition

Structural Alterations

First Fix Services

Need a Refurbishment architect in your area?

Builder step-by-step cost guide for your refurbishment/renovation project.

Pre-Start & Site Setup

Strip-Out, Demolition & Structural Alterations

External Repairs & Fabric Upgrades

First Fix Services (Mechanical, Electrical & Plumbing)

Internal Walls, Plastering & Finishes

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