Kitchen Extension Statistics UK 2026

50+ Stats You Need to Know

Last Updated: February 2026 | Next Update: May 2026

Looking for the latest kitchen extension statistics in the UK? We’ve compiled over 50 up-to-date stats from government sources, industry bodies, and property research to give you the complete picture of kitchen extensions in 2026. Whether you’re a homeowner planning a project, a journalist researching the market, or a property professional advising clients, these statistics provide the data you need.

Key Kitchen Extension Statistics (2026)

Before diving into the details, here are the most important kitchen extension statistics:

A well-designed kitchen extension can add 10-15% to a property’s value in the UK. (Source: RICS, 2025)
The median spend on UK home renovations reached £21,440 in 2024, up 26% year-on-year. (Source: Houzz UK Survey, 2025)
Single-storey kitchen extensions cost £2,200-£3,300 per square metre in 2025-2026. (Source: FMB/Industry Data, 2025)
87% of all planning applications in England were approved in the year ending September 2025. (Source: DLUHC, 2025)
89% of householder development applications were granted approval in 2025. (Source: DLUHC Planning Statistics, 2025)
51% of UK homeowners renovated their homes in 2024. (Source: Houzz UK Survey, 2025)
61% of renovating homeowners plan to stay in their home for at least 11 years after completion. (Source: Houzz UK Survey, 2025)

Kitchen Extension Cost Statistics

Average Costs by Size and Type

A typical single-storey kitchen extension costs £50,000-£120,000 depending on size and specification. (Source: Homebuilding & Renovating, 2025)
Kitchen extensions in London cost £1,700+ per square metre on average. (Source: FMB, 2025)
Single-storey extensions cost £2,200-£3,300 per square metre across the UK. (Source: Industry Average, 2025)
A 20m² single-storey extension typically costs £50,000-£70,000 in London and Surrey. (Source: DeVis Architecture, 2025)
A 30m² kitchen extension with mid-range specification costs approximately £82,500. (Source: Homebuilding & Renovating, 2025)
Side return extensions in London typically cost £30,000-£60,000. (Source: Checkatrade, 2025)
Double-storey extensions range from £80,000-£130,000 for a 20m² footprint. (Source: DeVis Architecture, 2025)

Key Finding: Kitchen extension costs have stabilised after a 28% drop from previous highs, with the UK construction market set for a modest 4% price increase by late 2025.

Cost Breakdown

Structural work (foundations, walls, roof) accounts for 50-60% of total kitchen extension costs. (Source: Industry Standard, 2025)
Professional fees (architects, planning, structural engineers) add 10-15% to project costs. (Source: RIBA, 2025)
Kitchen fitting and finishes typically represent 20-30% of total spend. (Source: Houzz Kitchen Trends, 2025)
First fix (electrics, plumbing) costs approximately £2,500-£3,500 per square metre. (Source: DeVis Architecture, 2025)
A mid-range kitchen fit-out costs £15,000-£25,000, with high-end options exceeding £50,000. (Source: Industry Data, 2025)

Regional Cost Variations

London kitchen extensions cost 10-20% more than the national average. (Source: RICS BCIS, 2025)
Northern England and Scotland projects can be 10-15% cheaper than the South. (Source: Industry Data, 2025)
Planning permission application fees are £528 in England. (Source: Planning Portal, 2025)

Property Value & ROI Statistics

A kitchen extension can add 10-15% to a property’s value. (Source: RICS/Industry Research, 2025)
Home improvements that add floor area can add up to 25% to a property’s value. (Source: Nationwide Building Society, 2023)
A new kitchen alone can add approximately 4% to a property’s value. (Source: RICS, 2025)
The average extension delivers a 71% return on investment. (Source: Property Research, 2025)
Double-storey extensions deliver the highest returns, adding 15-20% to home values. (Source: Industry Analysis, 2025)
An extra bedroom created through extension can add nearly 15% to property value. (Source: Nationwide Building Society, 2023)
An extra bathroom adds approximately 6% to the value of the average home. (Source: Nationwide Building Society, 2023)
Removing internal walls to create open-plan spaces can add up to £48,000 in London. (Source: HomeOwners Alliance/FMB, 2025)

Key Finding: Property experts recommend spending no more than 15-20% of your current property value on extensions to maximise ROI potential.

Planning Permission Statistics

National Planning Statistics

87% of all planning applications in England were granted in the year ending September 2025. (Source: DLUHC, December 2025)
Approximately 327,000 planning applications were received in the year ending September 2025. (Source: DLUHC, 2025)
89-90% of householder development applications are approved. (Source: DLUHC Planning Statistics, 2025)
93% of householder applications are decided within 8 weeks or the agreed time. (Source: DLUHC, 2025)
Householder developments account for 51-52% of all planning decisions. (Source: DLUHC, 2025)

Permitted Development Statistics

Over 20% of extensions in 2025 were completed under permitted development rights. (Source: Resi, 2025)
Large householder extensions account for 51-57% of all permitted development applications. (Source: DLUHC, 2025)
78-80% of permitted development applications achieve overall acceptance. (Source: DLUHC, 2025)
Many single-storey rear extensions up to 3m (4m for detached) fall under permitted development. (Source: Planning Portal, 2026)

London Borough Variations

Planning approval rates in London boroughs range from 64% (Hounslow) to 98% (Hammersmith & Fulham). (Source: London Forum, 2025)
26 of 32 London boroughs show approval rates between 70% and 89%. (Source: DLUHC/London Forum, 2025)
Over 90% of applications in most London boroughs are delegated to officers for decision. (Source: DLUHC, 2025)

Homeowner Trends & Motivation Statistics

Renovation Activity

51% of UK homeowners renovated their homes in 2024, up from 48% in 2023. (Source: Houzz UK Survey, 2025)
The median spend on home renovations was £21,440 in 2024, a 26% increase year-on-year. (Source: Houzz UK Survey, 2025)
The top 10% of renovating homeowners spent £169,000 on home renovations in 2024. (Source: Houzz UK Survey, 2025)
49% of homeowners plan to renovate in 2025. (Source: Houzz UK Survey, 2025)
60% of homeowners plan to decorate or furnish in 2025. (Source: Houzz UK Survey, 2025)
78% of homeowners prefer to improve rather than move. (Source: Beams Research, 2024)

Motivations for Extending

Pent-up demand is the strongest motivator, with 36% citing financial means and 33% citing time. (Source: Houzz UK Survey, 2025)
61% of renovating homeowners plan to stay in their home for at least 11 years post-project. (Source: Houzz UK Survey, 2025)
46% of homeowners cite improving energy efficiency as highly important. (Source: Houzz UK Survey, 2023)
53% of renovating homeowners live in homes built in 1940 or earlier. (Source: Houzz UK Survey, 2025)
30% of homeowners want to customise a recently purchased home. (Source: Houzz UK Survey, 2023)

Key Finding: Kitchens are the most popular room to renovate and command the highest spend, with median kitchen renovation costs reaching £12,000.

Professional Hiring Trends

94% of renovating homeowners hired professional help in 2024. (Source: Houzz UK Survey, 2025)
59% of homeowners hired electricians for their renovation projects. (Source: Houzz UK Survey, 2025)
56% hired plumbers for their projects. (Source: Houzz UK Survey, 2025)
Demand for architects increased to 25% of projects in 2024. (Source: Houzz UK Survey, 2025)
Kitchen designers were hired by 25% of renovating homeowners, up from 19% in 2021. (Source: Houzz UK Survey, 2023)
Average kitchen fitter day rate is approximately £300. (Source: FMB/Red Box, 2025)

Project Timeline Statistics

Most kitchen extensions take 10-16 weeks from breaking ground to completion. (Source: Industry Standard, 2025)
A standard 5-10 week timeframe applies to simpler kitchen extension projects. (Source: MyJobQuote, 2026)
Planning permission decisions typically take 8 weeks for householder applications. (Source: DLUHC, 2025)
91% of major planning applications are decided within 13 weeks or the agreed timeframe. (Source: iHowz, 2025)
Complete bathroom renovations typically take 2-4 weeks. (Source: Industry Standard, 2025)

UK Housing Market Context

The average UK house price rose by approximately £600 between January and March 2025. (Source: Property Market Data, 2025)
The average house price in the West Midlands was £274,000 as of February 2025. (Source: Land Registry, 2025)
87% of owner-occupied properties have at least one spare bedroom. (Source: English Housing Survey, 2023)
53% of owner-occupiers are classified as ‘under-occupiers’ with two or more spare bedrooms. (Source: English Housing Survey, 2023)
47% of UK housing stock is now rated EPC ‘C’ or higher, up from 16% in 2011. (Source: Nationwide, 2023)
225,067 annual rolling new home approvals—the lowest since 2012. (Source: iHowz, 2025)

Frequently Asked Questions

How much does a kitchen extension cost in the UK?

Kitchen extensions typically cost £50,000-£120,000 depending on size and specification. The average cost per square metre is £2,200-£3,300 for single-storey extensions, with London and the South East at the higher end of this range. A 20m² extension would typically cost £50,000-£70,000 before VAT and professional fees. (Sources: FMB, Homebuilding & Renovating, DeVis Architecture, 2025)

How much value does a kitchen extension add to a house?

A well-designed kitchen extension typically adds 10-15% to a property’s value, according to RICS and industry research. In some cases, particularly in high-demand London areas, this can reach 20% or more. Extensions that add floor area and create open-plan living spaces are particularly valued by buyers. (Sources: RICS, Nationwide Building Society, 2023-2025)

Do I need planning permission for a kitchen extension?

Many single-storey rear extensions fall under Permitted Development rights and don’t require full planning permission. Under current rules, you can typically extend up to 3 metres from the original rear wall (4 metres for detached properties) without planning permission, subject to conditions. Over 20% of extensions in 2025 were completed under permitted development. When permission is required, 89% of householder applications are approved. (Sources: Planning Portal, DLUHC, Resi, 2025)

How long does a kitchen extension take to build?

Most kitchen extensions take 10-16 weeks from breaking ground to completion, depending on size and complexity. Simpler projects may complete in 5-10 weeks. Planning permission decisions typically take up to 8 weeks for householder applications, with 93% decided within this timeframe or the agreed extension period. (Sources: Industry data, DLUHC, 2025)

What percentage of planning applications are approved?

In the year ending September 2025, 87% of all planning applications in England were approved. For householder developments specifically (including extensions), the approval rate is higher at 89-90%. London borough approval rates range from 64% to 98% depending on the area. (Source: DLUHC Planning Statistics, December 2025)

Methodology & Sources

This statistics page was compiled from authoritative sources including:

Government Sources: Department for Levelling Up, Housing and Communities (DLUHC) Planning Statistics, Planning Portal, Office for National Statistics (ONS)

Industry Bodies: Federation of Master Builders (FMB), Royal Institution of Chartered Surveyors (RICS), National House Building Council (NHBC), Nationwide Building Society

Research Surveys: Houzz UK Annual Home Study (2023-2025), Checkatrade Price Index, HomeOwners Alliance Research

Trade Publications: Homebuilding & Renovating, Self Build & Design, The Construction Index

All statistics include their original publication date. This page is updated quarterly to ensure accuracy.

Last reviewed: February 2026

Next scheduled update: May 2026

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