Your perfect extension starts here

Many of us have thought about extending our homes – whether it’s just adding a small conservatory to the back of your house, or building a multi-storey extension that brings a number of new rooms to your home. With property prices as they are, an extension can even be a financially sensible choice over and above moving to a bigger home.

However, many homeowners are put off by the potential stress involved in such a large home-improvement project. Do I need planning permission? Or an architect? Which tradespeople should I use? At Detail, we think building an extension should be as easy and stress-free as possible. That’s why, with our home-extension service, we take care of everything from planning permission and technical drawings to those last few finishing touches – so the only thing left to worry about is what to do with all that extra space.

Types of Extensions

Undertaking an extension on an existing property is a great way to make maximise space potential and add value to the property. If done properly, it is deemed a good investment and will up the property value. The different types of extensions are:

Building a single storey extension is the perfect way to create extra living space in your home, while transforming your space to better suit your lifestyle. It is also the perfect opportunity to get more natural light into interiors with the addition of rooflights and much sought after bi-fold doors.

Single storey extensions are built onto a part of the house whereby one or more sides of the extension is attached to the property and there is only the ground floor plus any basement built to it. Single storey extensions require building control but they might not require a planning permission. Depending on the size and the space required, single storey extensions can cost anywhere between £30K to £50K and above, but this is dependent on many different factors.


Multi-Storey extensions can be built into any part of the existing building. A double storey side extension can be used to add an additional bedroom or bathroom upstairs or even the creation of a dining room with a spectacular ceiling height.

Your options depend on whether your house is terraced, semi-detached, or detached, where you live, and the type of house. In some situations, you may only be able to build a rear extension with limited space on the upper storeys, whereas in others you may be able to extend to the side and the rear of your home.

For a double storey extension, budget anywhere from £65K upwards depending on the size and scope of the project.


An orangery is made up from solid brick pillars, large glazed windows, brick or stone bases, a lantern roof and a corbel gutter, creating a parapet inside the orangery. They were traditionally built for the aristocracy of the world to house exotic fruits. Many of them had stoves, underfloor heating or shutters to ensure they were warm all year round.

Technology has advanced a lot since the original orangeries were first built, with various new designs being introduced, giving you many more options for how your orangery looks. The original lantern roof is fantastic at adding even more light into a room, but to take it one step further, you can get orangeries with a full glass roof. The average price of an Orangery stands at around £19k, although wood is generally more expensive with average prices from £20k onwards.


A conservatory is a room made with a glass roof and walls. Like an orangery, conservatories were originally built to maintain citrus fruits and tender plants that weren’t native to the UK throughout the winter. A conservatory tends to have 75% or more glazing on the roof, whilst it is the opposite for orangeries.

Insulated glazing is what brought the conservatory into the mainstream with architects and builders recreating Victorian style conservatories for our homes in the 1970s-80s. Now we have all sorts of styles available, from Edwardian and Elizabethan to Verandahs and lean to conservatories. Conservatory costs vary from around £6k to up to £20k, depending on what design to you decide to take on, the size of your property, and your location.


Wrap Around extensions are created by combining a side return extension and a rear extension together. Mostly they involve building the side wall closer to the neighbouring building border and moving the rear wall of your property into the rear garden, creating an L shaped house extension. Benefits of this extension type include high flexibility and the huge increase of value to your home.

When planning this type of extension there are various aspects you might want to consider, such as the overall design balance of your home and the more disruptive nature of this type of extension.

Wrap around extensions cost approximately £55K upwards.


Why choose Detail Group?


Regardless of the scale, we will analyse and tailor every measurement to create tactical storage solutions.


We have years of experience within the construction industry, therefore our team have the knowledge to deliver projects to the highest standard, on time and to your budget.


With the expertise of our creative design team, we will take the time to find the latest trends, mateials and colours suited to your preferences!


Put your trust into an NHBC certified building contractor.

Plan your extension

Extension Guide Download

Click on the link below to download your free extension guide!