Home Extensions in Berkshire: A Complete 2026 Guide to Types, Costs, and Planning

With Berkshire property prices continuing to outperform the national average, extending your home has never made more financial sense. Rather than face stamp duty, estate agent fees, and the stress of moving, thousands of Berkshire homeowners every year choose to extend — creating the extra space they need without leaving the neighbourhood they love.

Nuova Home Improvements specialises in home extensions across Berkshire, from single-storey rear extensions to double-storey side returns. In this guide, we cover everything you need to know.

Types of Home Extension

Single-Storey Rear Extension

The most common type of extension in Berkshire, a single-storey rear extension is perfect for creating an open-plan kitchen-diner, a larger living room, or an additional reception room. Under permitted development, you can extend a detached house by up to 8 metres from the rear wall without planning permission (4 metres for terraced and semi-detached properties).

Cost: approximately £1,500 – £2,500 per square metre, meaning a 20sqm extension typically costs £30,000 – £50,000.

Double-Storey Extension

A double-storey extension adds space on both floors simultaneously, making it excellent value. The ground floor might become a larger kitchen while the first floor gains an extra bedroom or en-suite bathroom. These almost always require full planning permission.

Cost: approximately £1,800 – £2,800 per square metre.

Side Return Extension

Common in Victorian and Edwardian terraces — which are abundant in Reading, Newbury, and other Berkshire towns — a side return extension fills in the narrow alley alongside the house. This can dramatically open up and enlarge the ground floor, particularly the kitchen.

Cost: approximately £25,000 – £45,000 depending on size and specification.

Wrap-Around Extension

Combining a rear and side extension, a wrap-around creates the maximum possible ground floor space. This is a transformational project that completely changes how a home feels and flows.

Cost: approximately £50,000 – £100,000+.

Do You Need Planning Permission for a Home Extension in Berkshire?

Under permitted development rights, many single-storey rear extensions do not require planning permission — provided they meet specific size and design criteria. However, permitted development does not apply in all situations:

•       Properties in conservation areas (e.g. parts of Windsor and Newbury) have stricter rules

•       Listed buildings always require listed building consent

•       Flats and maisonettes are excluded from permitted development

•       Extensions exceeding permitted development limits need full planning permission

Nuova Home Improvements works with experienced local architects and handles all planning applications on your behalf. We know the specific requirements of Berkshire councils — including West Berkshire, Windsor and Maidenhead, Reading Borough, and Wokingham Borough Councils — and ensure every project is fully compliant.

What to Consider Before Starting a Home Extension

•       Budget — get detailed, itemised quotes from at least two or three contractors

•       Planning — check permitted development rights early to avoid delays

•       Structural survey — essential for any work that removes walls or alters foundations

•       Party wall agreements — required when building near a neighbour's boundary

•       Disruption — consider how the build will affect your daily life and make contingency plans

How Long Does a Home Extension Take?

A single-storey rear extension typically takes 12–16 weeks from groundworks to completion. A larger double-storey extension may take 20–26 weeks. We provide a full project programme at the outset so you can plan ahead with confidence.

Will an Extension Add Value to My Berkshire Home?

In most cases, yes — significantly. Adding an extra bedroom through a double-storey extension, for example, can increase the value of a Berkshire property by 10–20%. An open-plan kitchen-diner created by a rear extension is consistently cited by estate agents as one of the features most likely to achieve a higher sale price.

📞 Thinking about extending your home in Berkshire? Contact Nuova Home Improvements for a free consultation. We cover Reading, Newbury, Windsor, Maidenhead, Wokingham, and surrounding areas.