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Extension types
Double storey extensions
A double storey (two storey) extension adds space on both floors: a bigger kitchen or living area downstairs and an extra bedroom, en-suite or home office upstairs. Because the foundations and roof are shared across two floors, it’s often better value per square metre than building single storey.
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- Building regs
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- 5.0 Google ratingRated by our clients
- Planning to completionOne team, every stage
- Wyboston LakesBased near St Neots
- Cambs & BedsHomes and businesses
Is it right for you?
What a double storey extension is great for
- Extra bedrooms and en-suites
- Growing families
- Home offices
- Adding value with more floor space
Things to think about
- Impact on neighbours’ light and privacy is key for planning
- Matching brickwork, roof tiles and windows to the existing house
- Opening up the first floor means some upstairs disruption
- Building over a garage needs careful structural design
Joe managed our two storey extension in 2016 and I am about to engage Tier One Developments for our next project. I trust Joe to deliver honest advice and high quality results. He’s realistic in his budgeting and takes time to plan…
FAQs
Double storey extensions: your questions
Can’t see your question? Call us on 01480 272 600 or send us a message.
Is a double storey extension better value than single storey?
Often, per square metre, because foundations and roof are shared across two floors. If you may need more bedrooms later, building both storeys now is usually far cheaper than adding a second storey afterwards.
Do two storey extensions need planning permission?
Most do. A limited number of two storey rear extensions can be permitted development, but side and larger designs need an application. We prepare the drawings and handle the application for you.
Can you build an extension over my garage?
Often, yes. It needs careful structural design, and we work with a structural engineer from the start. Our Dovehouse project in St Neots is a good example.
Guides
Helpful reading on double storey projects
GuidesSingle or double storey extension: which is right for your home?Both can transform a home. We compare space, cost, planning and disruption to help you choose.Read article 
GuidesDo I need planning permission for an extension?Many extensions can be built under permitted development, without a full planning application. Here’s how the rules work and when you’ll need permission.Read article 
GuidesBuilding regulations explained: what you need for an extensionPlanning is about how a building looks; building regulations are about how it’s built. Here’s what approval involves, from drawings to the completion certificate.Read article More options
Other types of extension
- Single storey rear extensionsThe most popular way to add space: a bigger kitchen, family room or open-plan living area at the back of the house.Find out more
Side return extensionsMake use of the narrow passage beside your house to widen the kitchen and transform a dark, awkward layout.Find out more 
Wraparound extensionsCombine a side and rear extension in an L shape for the biggest possible open-plan ground floor.Find out more 
Kitchen extensionsCreate the kitchen-diner you’ve always wanted, designed, built and fitted by one team.Find out more 
Garage conversionsTurn an under-used garage into a living room, office, gym or self-contained annex.Find out more 
Loft conversionsAdd a bedroom, en-suite or office in the roof space without losing any garden.Find out more 
Garden rooms and orangeriesLight-filled spaces that blur the line between house and garden, built to be used all year round.Find out more 
Porches and front extensionsImprove your home’s kerb appeal and add useful space at the front, from a porch to a ground floor bedroom.Find out more
Double storey extensions near you
- Extensions in St Neots
- Extensions in Little Paxton
- Extensions in Great Paxton
- Extensions in Buckden
- Extensions in Brampton
- Extensions in Godmanchester
- Extensions in Hemingford Grey
- Extensions in Hemingford Abbots
- Extensions in Houghton
- Extensions in Hilton
- Extensions in Kimbolton
- Extensions in Grafham
- Extensions in Olney
- Extensions in Hanslope area
- Extensions in MK Village
- Extensions in Bow Brickhill
- Extensions in Woburn Sands
- Extensions in Aspley Guise
- Extensions in Woburn
Planning a double storey project?
Let’s talk about your plans
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