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Side Extensions

4th June 2018

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Building Your Side Extension: From Planning Through to Final Design

Planning a side extension isn’t necessarily difficult; but a separate set of rules will apply when creating your design. Making sure your side extension complies with planning permission rules and building regulations is, therefore, essential, if you want to avoid problems further down the line.

Side Extensions and Planning Permission

In almost all cases, planning permission is needed when the side of a home is being extended.

As a general guide, you’ll need to make sure that:

  • If you live on designated land - which includes national parks and areas of outstanding natural beauty – you can’t build a side extension
  • Your proposed development isn’t built beyond the principal or side elevation, in the event that it’s facing on to a highway

Otherwise, consent should be granted, as long as:

  • The width of your dwelling is not greater than half the width of your original home
  • Your proposed build is single storey and does not exceed 4 metres in height
  • You use materials that match those used in your home

Other rules and restrictions apply. Your approved Ultra Installer will be able to tell you more and help you to build a design that’s compliant.

The below image shows what can be achieved when you use fluted super-insulated columns with French doors and an Ultrasky roof. The colours tie-in perfectly and the style of our Performance Glass Extension is both modern and classic.

Glass Extension Ideas


Side Extensions and Building Regulations

Building Regulations may apply to your proposed house extension design.

These rules exist separately to planning permission and broadly cover:

    • Access into and out of a building, so that is safe
    • Windows, doors and roofs
    • Electrical systems
    • Drainage

Please speak to the department at your local authority if you want advice about building regulations or refer your queries to your approved Ultra Installer.

Side Extensions: Design Inspiration

Making sure your new room is compliant; but so is refining the design of your room, so that it looks and performs the way you need it to.

Option 1: Performance Glass Extension

Enjoy a space that’s built with light and comfort in mind, while also delivering incredible aesthetics that people are bound to remark upon.

Your side extension will include:

Super-Insulated Columns

Our super-insulated columns deliver thermal efficiency levels five times higher than a brick pier built to the same size specification. Larger columns will sit at the corners of your side extension and smaller inline ones will complete the sequence in between.

Create a classic or contemporary new room by opting for a flat or fluted design. Our super-insulated columns can even sit on top of a dwarf wall, meaning you’ll be able to achieve a traditional design that’s powered by truly modern performance.

Internal Insulated Pelmet

Your internally-plastered super-insulated columns will work beautifully with our insulated pelmet, which can also accommodate bi-fold doors and accept the installation of speakers and spotlights – resulting in a room that feels comfortable always.

Customise your room by adding:

  • Customising the appearance of your installation by choosing any colour, thereby ensuring consistency of design throughout
  • Increasing the width of your side extension by choosing our Ultrasky roof instead of the Classic (a width of 6.5m is possible)
  • Adding a decorative cornice to hide your guttering from view, effortlessly creating stunning external sightline

The below image shows how effortlessly our Performance Glass Extension creates a 'real room' feel. A central lighting panel works with spotlights installed in the pelmet to create a cosy and comfortable space.


Option 2: Livinroof House Extension

Choose an extension that uses a solid conservatory roof like no other. You’ll be amazed at the amount of control you’ll have over the light.

Your side extension will include:

A hybrid design that’s glazed and solid

Where would you like the light to fall? On a breakfast bar? A table? With Livinroof, you’ll be able to focus illumination where it’s most needed. Even better than that, you’ll be able to ask your Ultra Installer to shape the glazing into any format.

Outstanding contemporary design:

  • Streamline the external appearance of this side extension with a decorative cornice
  • Super-insulated columns add dimension and style to this style of side extension
  • Contemporary grey panels in the roof enhance the room’s modern appearance
  • Remove internal doors to make your modern new space even more accessible

This panoramic shot of our Livinroof House Extension showcases flat super-insulated columns with French doors of the same colour. A decorative cornice hides the guttering and masonry is used to soften the external appearance of the room. 

Livinroof Conservatory Reviews


Option 3: Ultraroof House Extension

Similar in some ways to Livinroof, this is a side extension that draws on the benefits of glass and tiled conservatory roofs to deliver incredible performance and visuals.

Two Choices of Glass

Decide how you want light to enter your side extension. Full-height glazing can be used to ensure your room’s never too dark; Velux windows can be substituted, depending on your preference.

You’ll be able to focus the light when its needed either way. The high-performance glass in your Ultra roof will block out most solar rays and make your room thermally efficient.

Customise your Ultraroof by:

  • Selecting from one of three tiled colours, so that your side extension ties in with the look of your home
  • Further improving your roofline by adding a curved decorative cornice that’ll hide your guttering

That’s not to mention the super-insulated columns and insulated pelmet, which will help you build a traditional-looking or contemporary side extension built for entertaining and family time.

As you can see by looking at the picture below, the Ultraroof House Extension can exclude connecting doors. Light is used to great effect in this instance to create a sense of space in a room that's relatively small in scale.

Side Extension Design Ideas


Side Extension FAQs

How long will it take to fit my side extension?

Fitting your side extension won’t take long. Ultraframe’s conservatory roofs are pre-fabricated to speed up installation time on site.

Am I responsible for getting planning permission?

You can liaise with your local authority’s planning department if you want to. Your Ultra Installer will manage this process for you though, to minimise inconvenience.

How do I get prices for my side extension?

The materials you choose, the size of your proposed build – and other mitigating factors – will influence the cost of your project. Ask your Ultra Installer for details.

Are your approved Ultra Installers reliable?

Our nationwide network of installers has been assessed internally. Our scheme has been approved by Which? Trusted Traders for our customers’ further peace of mind.


Contact Your Nearest Side Extensions Installer

Use our search tool to find a trusted installer near you. In the meantime, use our VR tool to take a closer look at our house extensions, conservatories and orangeries.

If you like a particular image, save it to your Scrapbook – which you can access anytime: at home, at work or when you’re on the move.

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