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7 Single-Storey Extensions Design Ideas

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Often built within Permitted Development, a single storey extension can provide much needed extra space for your home

Light-filled Extension to a Victorian Home
(Image credit: Simon Maxwell)

A single storey extension can add much needed space to a home, while often being achievable under Permitted Development rights, saving you the headache of having to achieve planning permission.

Whether it’s to create a larger kitchen or you dream of an open plan space for your main living areas, a single storey extension can unlock the potential of a plot and reinvigorate all manner of houses, from listed buildings to bungalows.

1. A Timber-clad CLT Extension

CLT extension to a listed barn conversion

(Image credit: James Morris)

This CLT extension to a listed barn conversion is a prime example of how to marry contemporary with traditional.

  • Build cost: £250,000
  • Build time: Five months
  • Location: Hampshire

2. Transformation of a Post-War Detached House

A stunning, utterly unique contemporary remodel and extension to a standard post-war detached home

(Image credit: Simon Maxwell)

This incredible extension from the rear of a post-war detached house has allowed for the existing home to be transformed into a dramatic double-height open plan space.

  • Build Cost: £295,000
  • Build Time: 11 months
  • Location: Hampshire

3. Light-filled Extension to a Victorian Home

Light-filled Extension to a Victorian Home

(Image credit: .)

After living in the house for two years, the homeowners added this beautiful single-storey extension to create a living space that was flooded with natural light.

  • Build Cost: £280,000
  • Build time: 13 months
  • Location: Greater London

4. Contemporary Extension to a Listed Cottage

Grade II listed cottage renovated and extended

(Image credit: Mark Boulton)

These homeowners enlisted the services of Charlie Luxton to help them create this fabulous contemporary extension scheme that has opened up the living space of a listed cottage.

  • Build cost: £258,600
  • Build time: 12 months
  • Location: Wiltshire

5. A 1930s Bungalow Transformed

extended bungalow with timber clad gable

(Image credit: Paul Arthur)

This 1930s bungalow has been remodelled and extended to open out onto the mature garden.

  • Build cost: £150,000 (£714/m²)
  • Build time: 8 months
  • Location: Worcestershire

6. Creating an Open Plan Living Space

A contemporary extension to a family home

(Image credit: Andrew Priest)

Built under Permitted Development, this extension provides covered inside/outside entertaining space.

  • Build cost: £68,000
  • Build time: 4 months
  • Location: Oxfordshire

7. Light-filled Kitchen Extension

Glazed rear extension

(Image credit: Paul Arthur)

By extending their home, Penny and Douglas Dawson have replaced a small, dark kitchen with a light-filled, open place space.

  • Build cost: £120,000
  • Build time: 4 months
  • Location: West Midlands

(MORE: Building an Extension: Beginner's Guide)