We design and build house extensions in Cambridge that create practical, high-quality living space tailored to your home. Whether you’re looking to extend your kitchen, add an extra room or create open-plan living, we manage the entire project from start to finish.
With over 40 years of experience, we focus on delivering extensions that are well-built, carefully planned and designed to work for everyday living.
We build a wide range of house extensions in Cambridge, tailored to your property, space and how you want to use your home. Whether you’re looking to expand your kitchen, create open-plan living or add extra rooms, we’ll recommend the right type of extension for your needs.
We follow a clear, step-by-step process for house extensions in Cambridge to ensure everything runs smoothly from start to finish. From initial planning through to final completion, every stage is carefully managed with clear communication throughout.
We also take steps to minimise disruption wherever possible, keeping your home secure, organised and liveable during the build.
We visit your property to discuss your ideas, assess the space and provide practical advice on what’s possible based on your home and budget.
If you already have plans, we’ll work from them. If not, we can recommend trusted architects and guide you through the design process. We’ll also advise on planning permission and permitted development where required.
You’ll receive a clear, written quote outlining the full scope of work, so you know exactly what’s included before the project begins.
We prepare the site and carry out all necessary groundwork, including foundations. We work closely with building control to ensure everything meets regulations from the start.
The extension is built, including structure, roofing, windows and doors. Wherever possible, we complete the external structure before opening up into your home to minimise disruption and keep the property watertight.
All internal work is completed, including electrics, plumbing, plastering and carpentry, managed by our trusted subcontractor team.
We complete all finishing work and carry out final checks to ensure everything is built properly and ready for use, with building regulations signed off where required.
In many cases, house extensions fall under permitted development, meaning planning permission isn’t always required.
However, this depends on:
If planning permission is needed, we can guide you through the process or work alongside your architect to ensure everything is handled correctly.
The timeline depends on the size and complexity of the project.
As a general guide:
Factors that can affect timescales include:
We’ll provide a clear timeline before starting and keep you updated throughout the project.
In most cases, no, you can remain in your home while the extension is being built.
We plan the work carefully to minimise disruption, often completing as much of the external structure as possible before opening up into your existing home. This helps keep your property secure and weatherproof for as long as possible.
We’ll also work with you to manage any temporary disruptions, such as power or water interruptions.
There will always be some disruption with building work, but we take steps to keep this to a minimum.
Where possible, we:
We also keep you informed throughout, so you know what to expect at each stage.
In most cases, you won’t pay more Council Tax immediately after building an extension.
Your property is usually only re-evaluated for Council Tax when it’s sold, not when the work is completed. However, if the extension significantly increases the value of your home (for example, by adding extra rooms or increasing floor space), it could be placed into a higher band when the property is next sold.
If you’re unsure, you can check with your local council, but for most homeowners, there’s no immediate change in Council Tax after the extension is finished.
It depends on your property, but in many cases, building out (a single-storey extension) is often more straightforward and can be more cost-effective than building up.
Building up (such as a double-storey extension or loft conversion) can involve:
However, building up can sometimes offer better value overall if you’re adding multiple rooms, as you’re gaining space across two levels.
The best option depends on your home, layout and what you want to achieve. We’ll assess your property and give honest advice on the most practical and cost-effective approach for your situation.
This privacy policy sets out how RW Jakes uses and protects any information that you give RW Jakes when you use this website.
RW Jakes is committed to ensuring that your privacy is protected. Should we ask you to provide certain information by which you can be identified when using this website, then you can be assured that it will only be used in accordance with this privacy statement in compliance with the UK General Data Protection Regulation (UK GDPR) and the Data Protection Act 2018.
RW Jakes may change this policy from time to time by updating this page. You should check this page from time to time to ensure that you are happy with any changes. This policy is effective from 09/02/2026.
What we collect
We may collect the following information:
What do we do with the information we gather?
We require this information to understand your needs and provide you with a better service, in particular for the following reasons:
Lawful basis for processing
We process your information under the following lawful bases:
Security
We are committed to ensuring that your information is secure. To prevent unauthorised access or disclosure, we have put in place suitable physical, electronic and managerial procedures to safeguard and secure the information we collect online.
How long we keep your data
We will retain personal data only for as long as necessary for the purposes explained above. Certain records, such as consultation forms, may be kept for up to 7 years in line with industry guidelines.
How we use cookies
A cookie is a small file which asks permission to be placed on your computer’s hard drive. Once you agree, the file is added and the cookie helps analyse web traffic or lets you know when you visit a particular site. Cookies allow web applications to respond to you as an individual. The web application can tailor its operations to your needs, likes and dislikes by gathering and remembering information about your preferences.
We use traffic log cookies to identify which pages are being used. This helps us analyse data about web page traffic and improve our website to tailor it to customer needs. We only use this information for statistical analysis purposes and then the data is removed from the system.
Overall, cookies help us provide you with a better website, by enabling us to monitor which pages you find useful and which you do not. A cookie in no way gives us access to your computer or any information about you, other than the data you choose to share with us.
When you first visit our website, you will be asked to accept or reject non-essential cookies (such as analytics or advertising cookies). You can change your preferences at any time by clicking the “Cookie Settings” link in the footer of our site.
Links to other websites
Our website may contain links to other websites of interest. However, once you have used these links to leave our site, you should note that we do not have any control over that other website. Therefore, we cannot be responsible for the protection and privacy of any information which you provide whilst visiting such sites and such sites are not governed by this privacy statement. You should exercise caution and look at the privacy statement applicable to the website in question.
Controlling your personal information
You may choose to restrict the collection or use of your personal information in the following ways:
We will not sell, distribute or lease your personal information to third parties unless we have your permission or are required by law to do so.
Your rights under UK GDPR
Under UK GDPR, you have the right to:
If you would like a copy of the information held on you, please email info@rwjakes.co.uk or write to 12 Egremont Road, Cambridge, Cambridgeshire, CB23 7XR.
If you believe that any information we are holding on you is incorrect or incomplete, please write to or email us as soon as possible at the above address. We will promptly correct any information found to be incorrect.
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The content of this website, including but not limited to text, graphics, images, logos, and software, is the property of RW Jakes or its content suppliers and is protected by the United Kingdom and international copyright laws.
You may not reproduce, distribute, publish, display, modify, create derivative works from, or exploit in any way the content of this website without the prior written consent of RW Jakes.
You may download, print, and store limited copies of the content of this website for your personal, non-commercial use, provided that you do not alter or remove any copyright, trademark, or other proprietary notices.
Any unauthorized use of the content of this website may violate copyright laws, trademark laws, and other laws. RW Jakes reserves the right to take legal action against any unauthorised use of the content of this website.
This website, RW Jakes, uses cookies to improve your browsing experience and to help us understand how users interact with our site. This Cookies Policy explains what cookies are, how we use cookies, and how you can manage your cookie preferences.
What are cookies?
Cookies are small text files that are stored on your device when you visit a website. They are widely used to make websites work, or work more efficiently, as well as to provide information to the owners of the site.
How we use cookies
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Cookies that we use
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Cookie consent
When you first visit our website, you will be asked to accept or reject non-essential cookies (such as analytics or advertising cookies). Essential cookies will be placed regardless, as they are required for the website to function.
Changing your preferences
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Third-party cookies
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Cookie duration
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Managing your cookie preferences
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This website is operated by RW Jakes (the “Website”). By using the Website, you agree to be bound by these Terms of Use (the “Terms”). If you do not agree to these Terms, please do not use the Website.
The Website is intended for your personal, non-commercial use. You may not use the Website for any illegal or unauthorized purpose. You may not use the Website in a way that could damage, disable, overburden, or impair the Website or interfere with any other party’s use of the Website.
The content of the Website, including but not limited to text, graphics, images, logos, and software, is the property of RW Jakes or its content suppliers and is protected by the United Kingdom and international copyright laws. You may not reproduce, distribute, publish, display, modify, create derivative works from, or exploit in any way the content of the Website without the prior written consent of RW Jakes.
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This website (the “Website”) is provided by RW Jakes, on an “as is” and “as available” basis. RW Jakes makes no representations or warranties of any kind, express or implied, as to the operation of the Website or the information, content, materials, or products included on the Website.
RW Jakes will not be liable for any errors or omissions in the content of the Website, or for any actions taken in reliance on the information provided on the Website. RW Jakes will not be liable for any damages of any kind arising from the use of the Website, including but not limited to direct, indirect, incidental, punitive, and consequential damages.
[Name of Website] does not warrant that the Website will be available at all times or that the Website or any content will be error-free. RW Jakes reserves the right to modify, suspend, or discontinue the Website or any content at any time without notice.
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