House Extensions London

At Detailed Planning, we pride ourselves on providing you with an expert, reliable and professional house extension service in London. Every client and every project are treated with excellent care to ensure the success of your new home extension.

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Home Extension Services in London

House extension are an excellent way to make the most of your home or premises and to create a space that truly reflects your home. Whether you need additional rooms or simply want to open up the space you already have, we can help maximise your vision.

Extending your home not only allows you to expand your living space but can also increase the price and add value to your property. More and more people are recognising the benefits of house extensions, but many are discouraged by the fear of failure or expense. Especially when considering recent times and the pandemic, many people are designing new spaces that incorporate the new normal.  Therefore, our practice combines experienced designers with an expert service to deliver high quality house extension plans for our clients. from a kitchen extension to single storey projects, a loft conversion and side return extension services, whether its support your growing family, or you just need more space, Detailed Planning have got you covered.

Property Extension Design & Build Services

Should you be looking for house extension services in London, you’re in the right place, London’s Leading architectural company, Detailed Planning have got you covered. We specialise in providing new extensions for properties across London and the surrounding areas. Should you need further information or have any questions regarding our completed loft conversion and extension solutions, simply call our professional design build team today. Having been creating unique extension designs and providing s site survey service for our customers across London for a number of years, our professional extension builders will ensure that they work closely alongside you to make sure that we fully understand your requirements and provide you with a home extension service of the highest standards. 

We’ve been providing home extensions for clients across London for many years and this has allowed us to develop a renowned reputation for providing an excellent service. From rear extensions to single storey and large double storey extensions, we can help. We pride ourselves on the high level of extension installations that we offer and the fact that we constantly go the extra mile for all of our customers in London. We’ve been offering our extension solutions across London for a number of years now, so you can rest assured and have peace of mind that you’re in good hands with our experienced team of extension builders. If you require any additional information on the extensions we offer across London, for more information call Detailed Planning today, or you can check out our Beginners Guide to House Extensions

Our Services

1. Design Ideas

Whether your family is growing, and you need more space or an extra bedroom, or you want a new bright modern living; we can help find a solution to maximise your space. Here at Detailed Planning, we have a design build team of trained designers who will carry out a site survey, and are specialised in creating amazing spaces for all types of briefs. We understand the cost of developing a property, so we’re sensitive to our cost guidance. We aim to help you stretch your money enough to get the best results! Read More Here

2. Get Approved

We are experts at obtaining planning consent for house extensions. If your house benefits from permitted development rights, we’ll complete the necessary drawing and documents to demonstrate your proposal falls within permitted development guidance. Should your house extensions require planning consent, we can give you the best chance of planning consent by acting as your agent throughout the process. Read More Here

3. Technical

This is the stage where the detailed technical drawings are carried out by our design build team. We believe in providing extra detail so your builder will construct your project with the quality it deserves. Remember, in order for a project to go accordingly, having a good, detailed set of drawings is crucial. Read More Here

4. Ready. Set. Go

At last! Your dream home is now ready to go under construction! This is all very exciting and you now have all the relevant drawings to hand. At this point of the project, we provide continued support service, so feel free to call us whenever you like. All that’s left to do now is grab a cup of tea and relax!

London House Extension Case Study

This house project exceeded our client’s expectations and created a space for their family to enjoy for years to come.

Looking For More House Extension Ideas? Here’s Some of Our Favourites

If you are looking to get a London house extension, look no further, at Detailed Planning we’ve been offering extensions across London for a number of years. Our professional project manager team can be on hand and will cover all aspects of property extensions. If you are choosing to have a home extension in London, to create more room or storage, maybe a kitchen extension, or to avoid moving to a new house, our team has got you covered. We’re specialists in home extensions and we also have all the skills and knowledge required to make sure that your extension meets all of your needs. 

If you’re interested in house extensions and are based in London or the surrounding areas, simply call Detailed Planning today. Our project manager team of highly experienced professionals can assist with all aspects of your house extension. Regardless of how small or large the project is, we’re confident that we can transform your home for the better. Should you have any queries on the house extensions we provide across London, please call our team of extension builders today.

Excellent service. Paul is very thorough and took his time to make his decisions and explain them to me. He is friendly and helpful and has a ‘can do’ attitude.

Would definitely recommend for any detailed drawings required, we got them in late in the day to provide building regs drawings, were really efficient in completing within the required timescales and went into a lot of detail to make sure everything was right.

I felt in very capable hands and expertly advised. I’d highly recommend Detailed Planning. Our new loft conversion has maximised the space available to us. 

Why Choose Us For Your London House Extension Project?

Having offering property extensions in London for many years now, we should be the first port of call when it comes to being in search of house extensions. Regardless of your specific needs and renovation requirements, we can always be on hand to provide you with the best service, from a rear extension to kitchen extensions or ground floor extension, we will help transform your living space. As well as providing top-quality extensions, we also pride ourselves on providing superb customer care and attention to detail. From keeping things clean and tidy to the end results of your extension, London’s leading architectural company, Detailed Planning are the leading choice for those who are in search of property extensions in London. Our specialist project manager team can work with all of your requirements as well as accommodating your services to your budget, giving you complete customer satisfaction. Simply today for property extensions in London and we’ll take care of all your needs.

Having been designing and building property extensions for clients in London and throughout the surrounding areas for a number of years. Here are just some of the main reasons why we’re popular for extensions in London…

  • Range of extension styles to choose from
  • Years of experience in the industry
  • Well-known throughout London
  • Full design and build service available

Your #1 London Property Extension Company

Understanding Your Project Goals

When we begin, we’ll take time to understand your brief, you may also have ideas of how your home extension project or renovation will look. We’ll take this into consideration but also consider costs, planning constraints and buildability. There’s no point in designing something that can’t be built!

Striving to Create Quality Spaces

Our number one goal is to create spaces that meet requirements and go beyond the expectations of our clients. We love to hear that our clients are enjoying their new extension and this gives us the energy to go on.

Believe In Quality Design for Everyone

Good design and planning should not be limited to some Architects and designers only. We are here to provide excellent architectural environments to all, at a more realistic cost compared with some architect fees.

Pushing Technical Detail

Every house extension project and conversion or renovation is unique and ensuring it is buildable should be considered from the outset. Should we provide technical drawings, we’ll make sure risks on site are reduced by considering all parts of your project. This should lead to overall cost savings and minimised delays.

High Planning Success Rate

We never take on a project where the principle of the development seems unlikely to be approved. During the design, we’ll use our knowledge and check planning policies to give your application the best chance of success. We have worked with many authorities and understand how planning applications are decided.

Flexible Design Approach

We are not fixed to one design and build style; therefore we can be used for realist house extension design to ultra contemporary. We will listen to your brief, design and planning for your bespoke home extensions, meeting your needs.

Free Bespoke Quote

Want to talk about your project? We carry out a free review of each enquiry to ensure there is a reasonable chance of success.

Our quotes are free and we can provide free office consultations should your project be viable.

Single Storey House Extension Plan Fees

Whilst every project is entirely unique; presenting its own challenges, demands, and goals, we can give an idea for ball-park fees for various levels of service.

Site Visit/Measure

  • Consultation to Review Brief
  • Laser Measure of Your Property
  • Floor Plans and Elevation Measure
  • Existing Drainage and Property Investigation
  • Photographic Schedule
£250 +vat

*this price is an estimate based on previous project, not an actual quote


  • Existing Drawings
  • Proposed Drawings
  • Up to 3 free revised drawing sets
  • Planning application preparation (exc. council fee)

  • Act as your planning application
  • Negotiations and revisions with your case officer to achieve a successful application

£850 +vat

*this price is an estimate based on previous project, not an actual quote


  • Building regulation specification
  • 1:50 detailed plans
  • 1:50 section drawing
  • 1:10 detailed sections
  • Submission and liaising with Building Control (excl. fee)

  • Liaising with other consultations, i.e. engineer and party wall surveyor

£750 +vat

*this price is an estimate based on previous project, not an actual quote

£250 +vat

*this price is an estimate based on previous project, not an actual quote

£650 +vat

*this price is an estimate based on previous project, not an actual quote

£700 +vat

*this price is an estimate based on previous project, not an actual quote

For House Extensions in London call Detailed Planning Today

When it comes to property extensions in London or any of the surrounding areas, be sure to contact Detailed Planning. We have years of experience in the industry, we have all of the skills and knowledge needed to create the perfect home extension and renovation for you. Whether it’s a small extension or a multi-storey extension, our options include rear extension and kitchen extension projects, as well as ground floor renovations and conversion in your living space, loft refurbishments and rear renovation solutions, we have all of your needs covered. If you’re interested in having a bespoke home extension built, then be sure to get in touch with us to discuss your requirements, we aim to provide value for money building solutions.

When it comes to our home extensions and renovation services we provide them in and around London, this includes Barnet, the Cheshunt area, Edgware and Enfield. We also offer our build projects in Finchley and across Harrow. We offer our house extension services in North London, the South London area, across East London and West London.


1. How much experience do you have?

Detailed Planning have completed hundreds of successful home extension projects and ideas, from small extensions to large glazed modern extensions. We are up to date with planning and regulation policies to help avoid bumps in the process.

2. Have you worked within my local borough?
We’ve worked within every London Borough as well as the surrounding counties; this means we have excellent knowledge of what’s likely to be approved. Should we work further afield, we’ll make sure we’ll study the policies to determine if the development is feasibly, before proceeding.
3. Do you have liability insurance and a quality control process?

Our company has liability insurance of up to £1,000,000. To reduce risk, as well as using our depth of knowledge, we have a project management team to check others work prior to issue of any documents.

4. Will you manage all the pre-construction approvals?
The project will usually involve multiple approvals, not just planning consent. This will likely include, building control plan check approval, party wall agreements as well as structural calculations.
5. Will you assist with liaising with other consultants?

Yes, we will ensure that all the necessary consultants are instructed and are carrying out their duties. We discuss the project with them directly and make sure they have everything they need.

Our Drawings

Have a flick through some of our recent approved projects!

  • Company Number
  • Registered Address

    Detailed Planning Ltd
    1st Floor,
    311 Chase Rd,
    London N14 6JS

Contact Us

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