Home Extensions, Alterations using Sips Insulated Panels

Is an extension suitable for me?

An extension to your house can be an easier option to moving for gaining more living space. But how much will it cost for different types of extension? Will I need planning permission or do I fit current building regulations? Who will do the drawings and application process?
We will! We will do it all from start to finish!

Typical prices for an extension

As a rough idea you can typically say that it will cost £1000 to £1200 per m² or £93 to £111 per square feet. If you prefer old money for a basic extension. It includes basic plumbing and electrical work. This price is per unit area of internal floor space and so a 5x4m single floor extension will have a total floor area of 20m² and a double story will have 40m². Please note that the figure provided is for a standard extension, each project will be different and the above figure is a guide and is not appropriate for a small extension.

Approved drawings

For a accurate quote we will require a set of approved drawings. You will need a set of drawings for building control in any case this will cost around £450 per drawing, we are happy to facilitate this for you.

Why use Sips insulated panels?

SIPS are super insulated panels, a modern building material combining the inherent strength of composite structures with a high level of Insulation, as an off-site manufactured, modern building method. It is very easy to both employ and enjoy using the modularity of Sips, to deliver unique design features, including vaulted ceilings and larger rooms, whilst providing energy efficient solutions and offer 5% extra floor space.

Energy efficiency with Sips

Sips are not only energy efficient, they are incredibly strong and tested to be 5 – 7 times stronger than an equivalent timber frame. They also provide the key to easily achieving the high levels of insulation and air tightness required by recent changes in UK Building Regulations, without significant increase in wall thickness.
In addition, Sips contribute toward building fabric points under the code for sustainable homes and can be used with almost any internal or external finish, including render and cladding.


We spend a lot of time, money and effort when we produce a estimate. The award winning system HXBL downloads live material prices from national builders merchants, its quantity surveying element breaks down each part of the project into a 1000 smaller elements, assigning labour and material cost to produce a accurate and genuine price for your project. It is a expensive and highly sophisticate program but reflects our aim to offer a professional building service.