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We’re the UK’s largest architectural service for everyday homeowners. We provide home surveys, planning drawings, planning submission and building regulations.

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Our Connect service can introduce you to vetted building contractors, structural engineers and more. We’ll also guide you through the tendering process.

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Finance

Resi Finance is our in-house finance team, which has access to over 90 lenders. They can help you secure the funds needed to complete your project.

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Find out how much it costs for architectural design and planning support.

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Can I use Permitted Development?

This option can help you avoid subjective planning decisions.

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What value can I add to my home?

Discover the untapped potential in your property.

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What will my project cost to build?

Use our wealth of experience to estimate your construction costs.

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Our in-house finance team can help you explore the market.

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Resources

Extending your home

All you need to know about every variety of home extension.

Read Article

Garden room extensions

Expert advice for bringing your garden room to life.

Read Article

Kitchen extensions

A guide to kitchen extensions of all shapes and sizes.

Read Article

Single storey extensions

Top tips about our most popular type of home extension.

Read Article

Remortgaging your home

Key advice on how to finance your project when it’s time to build.

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Services

Design

We’re the UK’s largest architectural service for everyday homeowners. We provide home surveys, planning drawings, planning submission and building regulations.

About Design and Planning

New builds

Get a quick quote

Connect

Our Connect service can introduce you to vetted building contractors, structural engineers and more. We’ll also guide you through the tendering process.

About Connect

Building contractors

What will my project cost to build?

Finance

Resi Finance is our in-house finance team, which has access to over 90 lenders. They can help you secure the funds needed to complete your project.

About Resi Finance

Explore finance advice

Find a loan

Portfolio

Select a project type

Select a project type

Browse our completed projects and get inspired

Loft

Garden

Garage

Ground floor

First floor

View all

View all

Tools

Book a free architectural advice call

Speak to our design and planning team about your project.

Get Started

Get a quick quote for design

Find out how much it costs for architectural design and planning support.

Get Started

Can I use Permitted Development?

This option can help you avoid subjective planning decisions.

Get Started

What value can I add to my home?

Discover the untapped potential in your property.

Get Started

What will my project cost to build?

Use our wealth of experience to estimate your construction costs.

Get Started

Can Resi help me find a loan?

Our in-house finance team can help you explore the market.

Get Started

Resources

View All

Extending your home

All you need to know about every variety of home extension.

Read Article

Garden room extensions

Expert advice for bringing your garden room to life.

Read Article

Kitchen extensions

A guide to kitchen extensions of all shapes and sizes.

Read Article

Single storey extensions

Top tips about our most popular type of home extension.

Read Article

Remortgaging your home

Key advice on how to finance your project when it’s time to build.

Read Article

View all articles

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Construction cost calculator

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construction costs!

Answer a few quick questions below and we'll estimate the costs involved from our extensive experience working with projects like yours

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Construction cost estimator

The three main factors are extension type, the size and your location

Which part of the property are you looking to extend?

Select a part of your house to choose an extension type

Loft

Mansard Roof

L Shaped Dormer

Outrigger Dormer

Main Dormer

Hip To Gable With No Dormer

Hip To Gable With Main Dormer

No Dormer

Basement

Main House

Outrigger

Part House

Whole House

Ground

Side Infill

Side

Side And Rear

Rear

Wraparound

First

Side

Side And Rear

Rear

Rear Over Outrigger

Rear Over Ground Floor

Two Storey

Side

Rear

How big is the area being changed in square metres?

The total of the new area being added, and existing area impacted

Select an extension type above to see size options

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Kitchen Bedroom Bathroom Garden Facade Ground floor First floor Loft

Portfolio

Kitchen Bedroom Bathroom Garden Facade Ground floor First floor Loft

Resources

Advice centre FAQs House extension guide Single storey extension guide Kitchen extension guide Loft conversion guide Garden room extension guide Garage conversion guide

Resources

Advice centre FAQs House extension guide Single storey extension guide Kitchen extension guide Loft conversion guide Garden room extension guide Garage conversion guide

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Copyright © 2022 Resi Design Ltd.

Resi Design Ltd. trading as 'Resi' | Company No: 10471125

We are proud to employ architects registered with the Architects Registration Board and were awarded the mark for The Mayor's Good Work Standard for fair pay & conditions, wellbeing, skills, progression, diversity and recruitment.

Resi Finance Ltd is an appointed representative of Mortgage Advice Bureau Limited and Mortgage Advice Bureau (Derby) Limited who are authorised and regulated by the Financial Conduct Authority. Resi Finance Ltd. Registered Office: International House Canterbury Crescent, Floor 4, London, England, SW9 7QE. Registered in England Number: 12327535