Our easy guide to planning a timber frame extension

Planning an extension can be difficult if you don’t know where to start, which is why we have put together this helpful guide. It is a common misconception that planning permission is required; however, this is not needed for timber extensions for such areas as porches and outbuildings. We are CPM in Exeter we are and are local Exeter timber framed extension specialists.

Timber Framed Porches

Timber porch extensions extension
Timber Framed Porches, which are no bigger than 3m2 in width and height, don’t require permission.

(See Reference: General Planning Information Dartmoor Specific Permitted Development & Planning Policy Statement 7)

Single Storey Timber Framed Extensions

timber frame extension extensions

Single storey extensions are permissible if the following requirements are met:

  • Extension is less than half the area covered by the original house (as it was first built)
  • It’s not forward facing or side facing where there is a road
  • If extended to the rear, it would need to be less than 3 metres width and less than 4 metres height – sideways are less than half the width of the original house

Timber Framed Outbuildings

timber frame buildings extensions extension

Timber framed outbuildings include sheds, greenhouses, swimming pools, and cabins. They are permitted if they are not positioned in front of the principal wall of the main property, they are a single storey, no taller than 2.5 metres in height, and they do not include verandas, balconies or raised platforms. You are allowed to have carports attached to the outbuilding.

Why choose a Timber frame extension?

  • Historically, one of the reliable construction methods, dating back to Roman and Egyptian civilizations.
  • Typically quicker and easier to erect as most timber frame kits are produced in the UK – some are even put up within a matter of days.
  • Timber is strong and durable, some varieties such as glued laminated timber and cross-laminated timber can be precision engineered to rival and surpass the strength of steel and concrete.
  • Due to the speed of off-site manufacturing, low amount of wet trades, which dramatically reduces waste, timber frame extensions are often the most advantageous construction material.
  • Lower Carbon Footprint: Apart from being a renewable material, another advantage of timber frame construction is that is has a much lower embodied energy rating in comparison to concrete and steel. Timber is classified as carbon neutral, which refers to the amount of energy used to process, manufacture and delivery, and how it is offset by the amount of CO2 the timber frame will absorb during its lifetime.

How much does a Timber Frame Extension cost?

Timber frame extensions can be bought and erected from anywhere between £20,000-£40,000 depending on the size, layout, design and amount of windows.

In conclusion

If you’re considering an extension, definitely consider both timber or traditional brick and block. Why not get two quotes for both types, and see what they come back as. We are Complete Project Management (CPM) based in Exeter and working all across Exeter, Exmouth & Mid to East Devon. Contact us today if you would like a specialist out for a free quotation.