Double storey extension costs and ideas

How much does a double storey extension cost? 

As a basic rule of thumb, a two storey extension will cost around 50% more than a single storey extension. Read about extension costs per square metre in our guide here. Based on this guide a (3x6m) two storey extension would be upwards of £60,000 for the basic build cost.*

*Figures have been updated in 2022 following recent price increases in constructions costs of approximately 30%, according to a survey of architects and designers on Design for Me.

• Add on 10-15% for professional fees (architect, planning application, building regs, structural engineer) (£9000 at 15%)
• VAT (£12,000)

Double storey house extension cost = upwards of £81,000

Please note this does not include kitchens or bathrooms, and applies to most areas in the UK. Costs in London and SE can be considerably higher.  

For more detail, read our blog on calculating your a house extension cost here.

Double storey extension design ideas

Before meeting your architect for the first time, it’s useful to have a rough idea about the kind of style you like and what your design priorities are. To get you started, here are some inspirational renovation designs from the architects and interior designers on Design for Me.

Click on the images below to see their full profiles and see if they’re interested in working on your next home project by posting your home project!

Featured image above by Jan, architect from London. Click here to see more and shortlist him for your home project.

Design by Matt, architectural designer from Hammersmith. Click on the image to see more and shortlist them for your home project.

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Design by Stephen, architect from Southwark, London. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #slidingdoors

Design by Linda, interior designer from Haringey, London. Click on the image to see more and shortlist them for your home project.

#interiordesign #interiors #homedecor #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #glazing #architecturalglazing #naturallight #roofgarden #roofterrace

Design by Callum, architectural designer from South Staffordshire, West Midlands. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #glazing #architecturalglazing #naturallight

Design by Jennifer, architectural designer from Waverley, South East. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #kitchens #kitchendesign #kitcheninspiration #kitchenideas #kitchengoals #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #glazing #architecturalglazing #naturallight #slidingdoors #doubleheightspace

Design by Svinder, architect from Richmond upon Thames, London. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #doubleheightspace

Design by Martin, architect from Hackney, London. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #slidingdoors

Design by Hannah, architect from Southwark, London. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #slidingdoors

Design by James, architect from Hackney, London. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #slidingdoors

Design by james, architect from Cardiff. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #slidingdoors

Design by Tom, architectural designer from Hackney, London. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #glazing #architecturalglazing #naturallight #bifolddoors #bifolds

Design by James, architect from Bristol, City of, South West. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #glazing #architecturalglazing #naturallight

Design by Ian, architect from Kensington and Chelsea, London. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #glazing #architecturalglazing #naturallight

Design by Callum, architectural designer from South Staffordshire, West Midlands. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension #glazing #architecturalglazing #naturallight

Design by Laura, architect from Wandsworth, London. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension

Design by Daniel, architect from Hackney, London. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension

Design by Elena, architect from Islington, London. Click on the image to see more and shortlist them for your home project.

#architecture #homedesign #modernhomes #homeinspiration #extensions #extensiondesign #extensioninspiration #extensionideas #houseextension

We have 100s more architects and interior designers all over the UK that we’ll quickly match to your requirements and see who’s interested. After you post your project you can choose up to three interested design professionals for an initial consultation. And it’s all completely free!

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Here at Design for Me we match you with the right design professional, from thousands all over the UK. Get quotes & arrange up to three no obligation consultations. And it’s all completely free! Find out more here or get started below…

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