Rear Extensions
in Portsmouth and Hampshire

C. Lillington builds rear extensions using available land in your back garden to create more floor space over one or more storeys. Plan for a new kitchen or a relaxation room where you can enjoy views of the outside world. If you are building over two storeys, why not add an extra bedroom as well? We have a talented workforce with the skills needed to increase your property’s footprint but without the expense of a house move.

Rear extensions are popular when constructed as single-storey additions to period properties in Portsmouth and Hampshire.

Edwardian and Victorian builds have less integration to the rear, so an extension is one of the most effective ways to create more open and free-flowing interior space.

We cover all phases of construction to include:

  • Surveys, Consultations and Quotations
  • Help with Planning and Design
  • Advice on Planning Permission
  • Clearances and Bulk Excavations
  • Groundworks and Foundations
  • Carpentry and Joinery
  • Plumbing and Heating
  • Electrical and Lighting
  • 1st-Fix and 2nd-Fix Services
  • Plastering and Rendering
  • Painting and Decorating
  • Roofing and Roofline Work
  • Snags, Sign-Off and Certification
  • Managing the Build from Start to Finish


To see what previous customers have to say about our rear extensions, please take the time to read their testimonials.

Planning Permission for Rear Extensions

It is usually possible to build rear extensions in Portsmouth and the surrounding Hampshire area without local authority approval. For the build to fall inside permitted development, it can only take up half of the garden space. The uppermost part of the extension shouldn’t exceed the original eaves. If it comes within two metres of the property’s boundary, then the eaves cannot exceed a height of three metres.

Rear extensions must not extend beyond four metres of the build’s rear wall or beyond three metres of other properties.

Rear Extension

Separate regulations apply to double-storey extensions.

  • Working to the drawings of your architect or to our own design, we hold an initial meeting with the customer to finalise measurements and to listen to their ideas.
  • C. Lillington Carpentry advises you on planning approval by using its many years of combined experience in dealing with local authorities and building control officers.
  • With a solid plan in place, we submit quotations for rear extensions. These have detailed breakdowns of the overall costings for labour, materials, fixtures and fittings.
  • The pre-build phase begins with us finalising the plans and gaining build-over agreements from utility companies. We assess risk and prepare detailed method statements.
  • Construction begins on an agreed date. Throughout each phase of development, the assigned project manager will assess standards and co-ordinate all trades onsite.
  • With construction complete and any snags rectified, C. Lillington Carpentry liaises with building control to gain electrical, plumbing, gas and building certificates.

Homeowners in Portsmouth and the Hampshire area can have rear extensions built under the management of just one company instead of having to deal with multiple tradespeople on a separate basis. Project management is a key factor in the completion of any successful build, and it is an area in which we genuinely excel when working on conversions and extensions.

We also construct side-return and wraparound extensions.

For rear extensions in Portsmouth and all Hampshire areas, call C. Lillington Carpentry on 07796 201100.