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Double Storey Extension


Storey Extension

Opting for a double extension not only gives you that extra space but will also add value to your property.

Many homeowners consider a two storey extension over a single one as whichever option you choose, you only need one roof and set of footings.

Hence the reason of getting more value from your build and that extra space for bedrooms or bathrooms you require.

There are many options for where to have your extension built, the rear is normally the best location.

Keep in mind not to take too much away from your garden but if you have land to the side of your property this works well with many designs.

Before you start you will need to consider how to use the extra space, extra living space, kitchen and bathroom are the best use and easier to blend in to you existing property.

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Till now we have completed above 90 Projects like single storey extension , Double storey extension,
Convert to Flat, Loft Conversion, Basement Extension, 3D Visualisation, New Build, Change of Use, Interior Design, Commercial Architecture Service



  • This all comes down to your location, project size and final fixtures and fitting you want for your new two storey extension.
  • Costs that you can expect are those of tradesmen and labour, materials and planning fees.
  • To get quotes from builders they will need a set of plans for the build and at Extension Architecture we can offer you a free quote for plans.
  • Once you have your plans, aside from the actual build cost you will need to budget for the non build fees.
  • These include any party wall agreements you may need, application fees for your planning and building control charges.
  • Other cost that should be factored in are if you require a project manager, structural engineer or any survey costs.
  • The time of year can also play a factor in to the overall cost of a two storey extension with summer being the prefered option.
  • Once the ‘cut through’ from the new build to your home has been done you will have cold spots making the overall temperature drop meaning more heating costs.
  • Building work can be delayed by bad weather with bricklayers being ‘rained off’ and roofers unable to work in adverse conditions.
  • This will prolong the extension build and if you have electrical and other tradesmen booked in, they may need take other work until you are ready meaning finding last minute tradespeople.

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