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Extension Projects for Under £50k

Oak frame extension with glazed link
(Image credit: Border Oak)

Careful attention to detail, sourcing local materials, carrying out any work you can on a DIY basis and keeping one eye on the costs can all help to bring your extension project in on a tight budget.

If you are in need of some extension inspiration, take a look at this selection of projects that have all been achieved within a £50,000 budget.

(MORE: Building an extension? Follow this beginner’s guide)

1. A Sympathetic Extension

Oak frame extension to a stone house

(Image credit: Welsh Oak Frame)

Looking to add a new kitchen diner to their farmhouse in north Wales, the homeowners of this project chose Welsh Oak Frame to design and build their new addition. The oak frame complements the original farmhouse and adds character and warmth to the new space.

  • Location: North Wales
  • Cost: £40,000

(MORE: Get a quote for your extension project)

2. An ICF Addition

ICF extension to a stone cottage

(Image credit: Beco Wallform)

This cottage on the Scottish Borders has been subject to a large extension constructed using insulating concrete formwork (ICF) from Beco Wallform.

  • Location: Scottish Borders
  • Cost: Approximately £12,000 (for the Wallform structure)

Oak frame extension with glazed link

(Image credit: Border Oak)

Completed by Border Oak, this oak and glass single room extension has been added to a listed Arts and Crafts house, and joined with a modern frameless glass connection so that the two parts can be easily distinguished.

  • Cost: £45,000 (for the supply and erection of the oak frame)

(MORE: Get a quote for your extension project)

4. A Modern Orangery

Glazed sunroom extension

(Image credit: Anglian Home Improvements)

The owners of this period home wanted to introduce more space, and commissioned Anglian Home Improvements to add an orangery extension.

  • Cost: £18,000 (for design, materials and installation)

5. A Kitchen Diner Extension

Kitchen-diner extension with country-style kitchen

(Image credit: Chris Snook)

With a view to creating a more traditional space in keeping with the existing building, the clients behind this project were keen to knock down the old side extension to make way for a new addition.

The extension, designed by Design Squared, is clad in white render, and houses an open plan kitchen/dining/living area that is connected to the rear reception room.

(MORE: Get a quote for your extension project)

6. A 1930s Semi Extension

Modern single storey extension to semi-detached home

(Image credit: Clive Doyle)

The challenge for Samantha Worrall, an architect by profession, and Philip Osborne was how they could create more space for their growing family within their 1930s semi-detached home on a limited budget.

The answer to the problem came in the form of a crisp and contemporary rendered extension to the rear of the property, along with a small side extension that runs down one side of the house.

  • Cost: £40,000

7. A Glazed Lean-To

Conservatory extension to stone-clad property

(Image credit: David Salisbury)

The owners of this stone-clad home in Frome, Somerset were looking to create additional space off their existing kitchen. The couple opted for a lean-to conservatory filled with natural light.

Enlisting the services of David Salisbury, the design team at the company created a simple but effective design to perfectly fit the bill, complete with two skylights and top-hung windows for ventilation.

  • Cost: £40,000

8. A Seamless Addition

Contemporary extension to a 1970s semi-detached home

(Image credit: Eclipse Property Solutions)

After previously carrying out a garage conversion to this 1970s semi-detached home, Eclipse Property Solutions was enlisted once again by the homeowners to build a new kitchen/dining/family space to the rear.

  • Cost: £49,000

(MORE: Get a quote for your extension project)

9. An Oak Frame Kitchen Extension

A single storey extension with vaulted ceiling

(Image credit: Croft Architecture)

With a growing family, the owners of this three bedroom detached house in Staffordshire were becoming increasingly constrained by the property’s size.

Reluctant to move out of the area, the homeowners appointed Croft Architecture to come up with a design concept that would see their old, cold, leaking conservatory replaced with a modern, light-filled, open plan extension.

  • Cost: £50,000

10. A Semi-Detached Home Extended

Contemporary kitchen-diner extension

(Image credit: Eclipse Property Solutions)

When the homeowners bought this semi-detached home in London, they knew immediately they wanted to create a new extension to the rear of the property.

A new 8m x 5m flat roof extension was built and clad in London Stock bricks to match the existing brickwork, with reclaimed bricks, also London Stock, used internally as a feature wall. A bank of rooflights brings natural daylight into the new space.

  • Cost: £45,000

(MORE: Get a quote for your extension project)

Calculating Your Extension Costs

Looking to work out the build costs of your extension? Find out how much yours could cost with our extension cost calculator.

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