House Extensions Harrow | Trusted Experts - Detailed Planning
Harrow’s leading…

House Extensions Harrow

Are you thinking about building a single-storey rear extension? Or you want a double-storey extension? House extensions Harrow is frequently searched for by homeowners in the area, with many house extension projects being carried out, but how do you determine the best kitchen or home extension company in the area? 

You don’t have to! Our team here at Detailed Planning are experts in design and architecture, meaning we should be your first port of call when developing your dream home.

At Detailed Planning, we pride ourselves on providing you with an expert, reliable and professional service. Every client and every project is treated with excellent care to ensure the success of your project.

Or call us now on 020 8150 0494

Home Extension Services In Harrow

House extensions are an excellent way to make the most of your property and create a space that reflects your home. Whether you need additional rooms or want to open up the space you already have, we can help maximise your vision. Whether you are looking at rear extensions, need help with planning permission, or even would like to know more about how much a house extension cost can differ depending on what you want, we are the team for you!

Extending your Harrow home not only allows you to expand your living space, but it can also increase the value of your property. More and more people recognise 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 expert service to deliver high-quality house extension plans for our clients.

Here at Detailed Planning, we work closely with our clients to explain the process from start to finish whilst creating a design that will ensure a successful house extension that can be enjoyed for years. We will combine your brief with our expertise to design an extension that is individual to you.

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.

Property Extension Design & Build Services

Should you be looking for house extension services in Harrow, you’re in the right place; Detailed Planning has got you covered. We specialise in providing new extensions for properties across Harrow and the surrounding areas. Please call our professional team today if you need further information or have questions regarding our extension services.

Having been creating unique extension designs for our customers across Harrow for several years, our professional team will ensure that they work closely alongside you to ensure that we fully understand your requirements and provide you with an extension service of the highest standards. 

We’ve been providing extensions for clients across Harrow for many years, and this has allowed us to develop a renowned reputation for providing excellent service. 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 our customers in Harrow.

We’ve been offering our extension services across Harrow for several years now, so you can rest assured that you’re in good hands with our experienced team. If you require any additional information on the extensions, we offer across Harrow, for more information call Detailed Planning today.

Our Services

1. Design

Whether your family is growing, and you need an extra bedroom, or you want a new bright modern open, planned living, we can help find a solution to maximise your space. Here at Detailed Planning, we have a team of trained designers specialising in creating unique spaces for all briefs. We understand the cost of developing a property, so we’re sensitive to our costs and 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 extension 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 our design team carries out detailed technical drawings. We believe in providing extra detail so your builder constructs your project with the quality it deserves. Remember, a detailed set of drawings is crucial for a project to go accordingly. 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 a 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!

House Extension Case Study

This house extension 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 want a house extension in Harrow, look no further; at Detailed Planning, we’ve been offering extensions across Harrow for several years. Our professional team can be on hand and will cover all aspects of property extensions.

Our team has covered you if you choose to have an extension to create more room or storage or avoid moving to a new house. We’re specialists and have all the skills and knowledge required to ensure that your extension meets all your needs. Your dream house is right around the corner; you can have a kitchen extension to offer new usable space or even a conservatory if you want less outdoor space in your garden.

If you’re interested in house extensions and are based in Harrow or the surrounding areas, simply call Detailed Planning today. Our 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 Harrow, 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 House Extension Project?

Having offered property extensions in Harrow for many years, we should be the first port of call when it comes to being in search of house extensions. Regardless of your specific needs and requirements, we can always be on hand to provide you with the best service.

As well as providing top-quality extensions, we pride ourselves on providing superb customer care and attention to detail. From keeping things clean and tidy to the results of your extension, Detailed Planning is the leading choice for those searching for property extensions in Harrow.

Having been designing and building property extensions for clients in Harrow and surrounding areas for several years. Here are some main reasons why we’re famous for extensions in Harrow…

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

Your #1 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 house extension will look. We’ll take this into consideration but also consider costs, planning constraints and buildability. There’s no point 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 should not be limited to some Architects only. We are here to provide excellent architectural environments to all at a more realistic cost compared with some architect fees. If you are concerned about the cost, please speak to our team, we are happy to help! 

Pushing Technical Detail

Every house extension project 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 style; therefore we can be used for realist house extension design to ultra contemporary. We will listen to your brief and design a bespoke extension meeting your needs.

Free 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.

For House Extensions in Harrow call Detailed Planning Today

When it comes to property extensions in Harrow or surrounding areas, contact Detailed Planning. We have years of experience in the industry; we have all the skills and knowledge needed to create the perfect extension for you.

Whether it’s a small extension or a multi-storey extension, we have all of your needs covered. If you’re interested in having an extension built, then be sure to get in touch with us to discuss your requirements.

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


1. How much experience do you have?
Detailed Planning have completed hundreds of successful projects, 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 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!

Our Reviews

George, Phoenix, AZ
Daniel, Brooklyn, NY
Anna, Salt Lake City, UT
Steve, Columbia, MO
John, Jackson, MI
Sara, San Diego, CA

    Did You Know?

    We have completed over 1000 projects
    We have 97.5% success rate on planning application
    100% building regulations approval!

    What Our Clients Say