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    How Big Can a House Extension Be?

    How big can a house extension be? When you look to extend your home, it’s helpful to know just how much space you have to use. However, when you start designing it, you could find you don’t have as much as you thought.

    That’s because, when you ask how big can a house extension be, you could end up with different answers. Over the last few months, the rules for extensions in homes have changed. Until May 2019, you could build an extension up to 8×6 metres in many cases as permitted development, meaning it wouldn’t need planning permission.

    However, the rules have recently changed to leave you with half of the room you had before. If you want to build a house extension that exceeds four metres in height, and three metres in width, you’ll need to go through planning permission.

    While that means you can attempt to design any space you want with only your home’s land limiting you, getting the extension finished can take a lot longer. You’ll have to go through a lot of red tape, make several planning applications, and even go to consultations with neighbours and council members to prove your case.

    So, how big can a house extension be? The answer is it can be as big as you’re prepared to build it. If you want to avoid planning permission while still extending your home, you can work with a trusted local installer to design the build around the rules.

    That way, you can maximise the space you have, and use floor-to-ceiling double glazing and bi-fold doors to give the impression of more room. Alternatively, if you’d like a larger addition, you can consult with an installer too. To find one you can trust, talk to Conservatory Online Prices today!

    house extension planning permission

    House Extension Planning Permission

    If you’re planning a house extension, you’ll need to get permission to build it. In many cases, though, you’ll be allowed to build a small extension without planning permission. Doing this is what’s known as a ‘permitted development’ build, where you’re allowed to build on a certain amount of land. When it comes to a house extension, there are several rules you’ll need to follow to meet the regulations, though. Some of these rules include:

    • The extension cannot be higher than the highest part of the roof of your home
    • The eaves of the extension cannot be higher than the highest part of the eaves of your home
    • Your extension cannot extend beyond any wall facing a road if it forms the principal or side elevation of your home
    • The eaves of your extension cannot be taller than 3m if your extension is within 2m of a boundary
    • The exterior materials must be similar to the appearance of your home
    • A side extension cannot be wider than half the width of your home
    • Any extension cannot take up more than half the land around your home

    How Big Can a House Extension Have To Be?

    Because of this, you may be readjusting your thoughts about your extension. If you had a large build in mind, then you may not be able to create it. However, that doesn’t mean you can’t still make a superb extension to your home without needing to go through planning permission.

    When you design your build, you can fit it with features that add natural light and slim sightlines, helping your extension feel closer to nature. An ideal tool for bringing nature towards your home is bi-fold doors. Bi-fold doors fold away into the corner of the room when you open them, leaving a wide-open gateway to your garden, which is even more accessible with a low threshold option.

    You can also expand your space in other ways. For example, a roof could help you get a little more space overhead and gorgeous views as well. With solid and tiled roofs, you can select partial glazing, giving you control of your home’s lighting, and a brighter home throughout the year.

    However, for a truly standout addition, you could select a roof lantern for your extension. A roof lantern raises your roof upward with a vaulted glass skylight. This skylight sits in the centre of the ceiling, and it’s ideal for mealtimes, providing stunning views of the sky above when you eat.

    how big house extension

    House Extension Technical Surveys

    Before you build your house extension, you’ll need to check the land you’re using can support one. To do this, it’s wise to always invest in a technical survey of your property. Most installers do this as a matter of course, and often as part of your quote as well. A technical survey is a review of the land surrounding your property.

    During it, a qualified surveyor will take detailed notes of your garden and other surrounding areas, studying the topography and ecosystem around your home. With a technical survey, you can identify issues that you could face during the build, such as the position of drainage pipes, or check the stability of the land you’re looking to use.

    Without a technical survey, you might be building on land that won’t support your extension. Additionally, you could cause damage to your garden or the ecosystem around your home. Because of this, the survey might affect how big your house extension can be.

    If you run into issues during that, it can affect what land you can build on, and change the dimensions you’ll be able to use if you’re trying to meet permitted development rules. However, you can always build a larger extension, as long as you’re prepared to go through planning permission.

    House Extensions on Designated Land

    Another issue with building a house extension concerns where your home is. You might live in a conservation area, or on designated land. While you’re lucky to be living in a beautiful area like that, as they are often Areas of Outstanding Natural Beauty, you’re unlucky when it comes to how big your house extension can be.

    There are tight rules on what you can build in these areas, as planning authorities will look to preserve the current look of the location. That means you could be forced to build a slightly smaller extension, but you’ll still be able to build without planning permission.

    The exterior of the build can’t use stone, artificial stone, pebbledash, render, plastic, timber or tiles. However, that means brickwork is still on the cards! Also, you cannot extend the build beyond either the principal or side elevation of your home. Essentially, that means you can create your design as long as a tourist wouldn’t be able to spot it easily.

    However, you’ll still be able to build a space of the same size, so long as you can meet these restrictions. If you choose to build beyond any of the rules, whether on designated land or not, then you’ll need to apply for planning permission.

    how big can a house extension be 2020

    Neighbour Consultation Scheme for House Extensions

    If you do decide to build a larger extension than a 4mx3m design, you’ll have more hoops to jump through. One of them is the Neighbour Consultation Scheme, which puts your application to the test. During the scheme, the people who live on your street and around your home can put forward any objections they might have to you building your extension for three weeks.

    Your local planning authority will contact them for you as part of your application. If any objections are raised, then the authority will take them into account when deciding on approval.

    Because of this, you may end up having to go to consultations with neighbours to appeal your case. While this process can be time-consuming and stressful, it’s worth it if you believe your application will be successful. However, how big can a house extension have to be?

    If you don’t need acres of space, then there’s no need to go through the hassle of planning permission. Instead, you can build a bespoke, high-quality extension for your home that meets the regulations and avoids the red tape. That way, you could find that you save money down the line as well.

    How Much Can a House Extension Be?

    Depending on the size of your build, the cost of a house extension is £26,000 on average. However, with Conservatory Online Prices, you can build bigger for smaller prices. That’s because we connect you to local installers in your area. Local companies don’t have the overheads of national brands, which means they can offer lower prices and travel costs.

    They can offer technical surveys and step-by-step advice on planning permission too! And, if you’re wary of trusting a local installer, we have a network of trusted suppliers across the UK that we review constantly. Many of these companies have certifications from bodies like FENSA and CERTASS, so you get a house extension done right for less.

    If you’d like to find out how big your house extension could be, get in touch with us today! You can fill out our online contact form to begin the process of building an extension, or call the team on 0800 124 4307 for advice and information.

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