Are you looking for a house or kitchen extension, renovation or refurbishment in Harrow? House Extension London are here to assist you. We arrange a free no-obligation site visit at your property to assess your house extension aspirations, thoughts, vision, and budgetary concerns. We will help you plan, design and build you extension in Harrow.



Bespoke House Design in Harrow

We understand that no two houses are the same. Therefore, we only do 100% custom design, planning, and consult with you in each step of the process. Our architects will work closely with you to draw ideas into a final set of plans for the extension build phase. Planning permission rules vary from council to council. It is important to choose the right architects who have experience in your council to support your planning permission application.


Our build teams begin construction under the supervision of your personal project manager. We will provide you a detailed plan of the project to ensure that the right trades, tools, and materials will be on-site at the right times for a smooth build. Our construction is only completed when you are happy, the job site is then cleared so that you can start decorating your newly extended living space.


Our team has a lot of experience when it comes to kitchen extensions. A Kitchen extension in Harrow is one of the most popular types of home renovation undertaken by London residents. A newly added kitchen can increase the value of your property by 6% and many buyers in Harrow see this first when buying the property. Our team can offer our expertise and guidance so that your extension process runs efficiently.



You can choose from a wide range of house extension solutions, such as: Single storey extension, Rear Extensions, Double storey extension, Side extensions, Bungalow extensions, Garage & house extensions. We cover the whole of London and the home counties supplying a comprehensive solution to our clients varying requirements.



Most house improvements involve an addition of an extra space to accommodate either a new bigger kitchen, adding a shower or toilet under the stairs, increasing the internal space for big family functions. All modern house extensions nowadays have bi-fold doors, skylights, Velux windows etc. Many London families are opting for the open plan kitchen and dinner as they tend to offer better use of the space and feels spacious too. Contact our team today to discuss your house extension options and free no obligation quote.

What can we do for your Property in Harrow?

If you would like to discuss the ways in which a House Extension could enhance your Harrow property, call us on 0208 1050 675 or email info@houseextensionlondon.com to ask us any questions. For a free site survey and design consultation please fill out the form on the right and our team will get back to you as quickly as possible.



A large town in Greater London, Harrow is one of the principal settlements of the London Borough of Harrow. It has a population of around 150,000 people in an area of 50.48 km2. The town is undergoing a wave of redevelopment after a series of battles it faced in the past. The place is in an excellent economic, agricultural, educational, political, transportation, cultural, and demographic condition. It also provides sports, arts, public services, and other luxurious facilities for its citizens, indicating that they indeed live a luxurious life in Harrow.


As of now, it must be pretty evident as to why having a house in Harrow is one of the wisest choices to take. If you are a new immigrant to this foreign land, looking for a new home or apartment is something you should seek. However, if you are already a resident of this place and wish to add more space and value to your existing home (for any x-y-z reason), you should go for a house extension in Harrow. House extension is a popular choice for people residing in Harrow in general. People who have already availed these services highly recommend it as it proved out to be both cost-effective and a great way of the addition of space in the house. When you've outgrown your living space, expanding your living space becomes necessary. Moving charges are too high in London; hence rather than moving, a house extension becomes the easiest way to fulfil all of your growing needs. Moreover, house extension comes with double profit- it gives the owner additional space at a very cost-effective price. House extension harrow provides a great deal of expansion.

Permission for Planning:

There are certain rules and regulations you may need to follow before going for a house extension in Harrow. Some of the rules are:

  • Width must be lesser than the building if you are going for the side extensions.
  • Single storey building can be extended on both sides
  • Extensions' appearance must sync with the original building.
  • Under the "right to Light" law, your building must not cover the light entering the neighbourhood house.
  • Any of the extension parts should not be higher than the original roof.


Our top-rated company, HOUSE EXTENSION LONDON, happens to be a company specialising in house, loft, kitchen, garage, side-return, wrap-around, and rear extensions. A highly demanded company in Harrow, we accommodate all your extension requirements in West and North London.

We believe in giving our client’s idea about the design of their own house. The priority, as through that only we can reach our target of client satisfaction. Our project managers are of the highest potential that commits to their work and through their years of gaining experience and expertise in this field, offer you the best results. With extensive planning at first followed by a smooth and stress-free trajectory afterwards, we aim to make the process an enjoyable one for you. 

Be it any field related to house extension in Harrow; we guarantee to you services that are beyond satisfactory and instead of a stressful course, a memorable and exciting one!

Is there sufficient access to your house?

Though most of us forget to consider this how important it is, so ensure that you and your builder have access to the property. As an example- from guttering to gateways, you need to ensure that all of the practicalities are being covered, so that the work can be done feasibly.

Will the design suit your existing home?

As the extensions should seamlessly merge into the original part of the house, choose the design or consult with house-extension-harrow to come up with the best suitable designs. However, it doesn't mean that you need to match the materials exactly.

Consider the conditions of your home's surroundings.

Ensure that you've scrutinized everything regarding your home and it's an environment such as soil conditions, surrounding trees, flood, water situation and any other possibilities which could cause problems with an extension.

 Keep the neighbours updated.

Though you are absolutely free to do any extension at your home, do bear a thought for your neighbours. Even if your planning permission got approval, as a courtesy inform your neighbours about your building plans. It will make them aware too about the noises and disturbance.

Have you Chosen the best bit for your extension?

You may have already planned extensions in mind; you need to consider several other facts as well. A professional builder can help you here, and they can discuss the project complexity and possibilities, also they will help you out with the best solution.

Consider the cost

House extension cost depends on your locality, soil condition, extension type and on many other factors, but there are average figures which you can keep in mind. Though it also depends on the storey. On an average, it may cost you around £1,000–2,000 per square metre.

Our Harrow Building extension Services Includes:

Single Storey Home Extension Harrow

This one is one of the traditional types of extension, and an excellent choice for a house extension. It helps to maximize the natural lights in your home.

Rear House Extension in Harrow

It would be a great way to transform your outdoor living space alongside your home. Install bi-folding doors to create seamless merge for interior and exterior appearance.

Two Storey House Extensions in Harrow

If you are looking to create both living space and accommodation at the same time, the two-storey house extension would be the best choice for you. Plus this extension type is the most suitable type of extension for growing families.

Wrap Around / L Shaped House Extension in Harrow.

It combines both, long side extension and a rear extension and looks great for an open plan as well as for living areas.

Sunrooms in Harrow

The sunroom is an additional room in your house that allows natural lights to come in without being unusable or usable for half the year. Its roofs keep most of the sunlight away from the room to keep it cooler, and its central heating allows it to be efficiently heated in winters.


The reason why we should choose over our other fellow competitors is that we have everything planned, and we initiate construction only after our client’s consent. We believe in clearing all sorts of ambiguity and through the pillars of trust, move forward with the renovation process. 

Take a look at our renovation process which has broadly classified to its best 


The specialists that we have firstly take an ample amount of time to know about your dream project and expectations. We appreciate your requirements, consider the restrictions, and give you the best possible layout based on your desires.


To begin with extension work, there is some paperwork in which we require your support to finish. Deliberating with authority and completing this process as fast as we could, we pave a path to continue to your dreams.


With the completion of the previous tasks, our academically qualified builders, electricians, painters, plumbers, and carpenters set off to work with full passion and do not let their focus change till the very last day.


1) THE VALUABLE EXTRA SPACE - House extensions help to get rid of the real-time headaches provided by shifting to a new house. With no worries of changing schools for your children or again adjusting to a new environment- you give a lovely touch up to your previous home, which is a hundred times better than the former scenario.

2) CHEAPER AND EASIER - You need to be honest about your budget and needs. A house extension is the most convenient way out to get your desires and bank balance both in sync. The renovated house that House Extension London provides you with makes your old home way better than any new one as it transforms it completely giving it a new identity.

3) MAKE THE PROCESS ENERGY EFFICIENT- To be within your budget range and at the same time doing a good deed by saving the environment by efficiently using energy during the process and after it is all a person would want. Unlike the wastage of energy caused by the services of other companies, we keep this factor very well in mind and set up installations such that energy conservation has ensured.


Immediately get in touch with us to start the exciting journey. We provide you with FREE CONSULTATION to discuss your dream project. 

There is no doubt that the locals living in Harrow are smart enough to make intelligent choices when it comes to house extensions in Harrow. Our prior customers who have already got their homes renovated by us are living proof that we don’t just talk, we commit, and we do! 

Wasting your time consulting other non-promising services is of no use for you because the earlier you start, the better for you. Therefore, visit our site - https://houseextensionlondon.com/, now to know more about our schemes and processes in detail. At your service, always! - HOUSE EXTENSION LONDON.

Frequently Asked Questions about House Extensions in Harrow

A house or kitchen extension is an investment in your home, so we know you will have a few questions before you get started.

  • How long will my House Extension take in Harrow?

    A standard house extension takes between 7 to 9 weeks for the initial build. And a further 5-7 weeks for installation of kitchen and other facilities. Overall, there size of the building and the scope of the extension are the major factors on how long the house extension will take.

  • How quickly can you start an Extension at my Harrow property?

    Our lead times are currently at 3-4 weeks, assuming you have the architectural plans, structural calculations, and party wall notices ready. House Extension London have teams all over London and the home counties. Wherever you are based, we can get your house or kitchen extension started in as little as two weeks. If you have any questions, contact our highly experienced team who will guide you through the whole process in much more detail.

  • How much value will be added to my house in Harrow ?

    House extension is one of the fastest and most effective way to add value to your house. An expertly constructed and finished house or kitchen extension can add up to 25% value to your house. It’s a fantastic amount of value added to your house instead of spending this on stamp duty when moving home. At House Extension London, we believe you should prefer moving up instead of moving out.

  • How long will plans take to draw if we decided to go with House Extension London?

    Our process of House extension in Harrow starts with a site survey where our surveyor will visit your property and guide you on what is possible. All this will be free of charge as it’s a no-obligation quotation. After the site visit, you will be provided with a rough quote until we have the structural calculations ready. Once you are happy with the quote, we will draw a contract to be signed and give you a start date. House Extension London tries to cater for all our customers needs and we are proud to be one of London’s best extension builders.

  • How long are your quotations valid for?

    We review our prices every quarter to take into consideration price increases of materials and inflation too. Our quotations are therefore value for up to four months. In this time period, you can alter your quote to suit your needs if needed. We will work alongside you to alter any design you want until you are fully satisfied with it.

  • What size of an extension can I build under Permitted Development?

    Permitted development guidelines for the house extension size can vary based on the type of property you are extending. As a general estimate is that 3m is allowed for a terraced and semi-detached properties. Detached properties can get up to 4m without planning permission.

  • When do you need planning permission for an extension?

    You will need planning permission for an extension when the design and size of the extension exceeds the provisions of permitted development. If you live in a flat or conservation area you will need to apply for planning permission regardless of the design and size of the extension.

  • How long does planning permission take for a house extension?

    Once the planning application has been submitted to the local authority, it can take up to 8 weeks. It takes between 4 to 8 weeks for an architect to prepare and submit the plans. Ideally, we suggest to give at least 3 months in advance for the construction company to start the process.

  • Will my Boiler work effectively with my new House Extension?

    By adding a house extension, the demand for current hot water and heating systems will increase. You might need to change to a new boiler that has a bigger output. Many homes tend to install a hot water cylinder when extending their property to the rear.

  • What do I need to know about the Party Wall Act?

    Your neighbours cannot stop you from constructing up to, or even on, the boundary between your properties, even if it requires access onto their land. This issue is not covered by planning or building control. If you are undertaking a house extension that involves digging or building foundations within 3m of the boundary, party wall or party wall structure, or digging foundations within 6m of a boundary, this sort of work will require you to comply with the party wall act. You will need a surveyor to act on your behalf. Such an act does not apply in Scotland.

  • What if my House Extension is near or on a Sewer?

    If your house extension will be built over or near a seer, you have to contact your local water board before work commences. In many cases, your architect will have to draw plans on how you intend to change the pipework, and these will be submitted to the water board for approval. It can take up to 3-4 weeks to get this approved and we strongly suggest not to start any work before obtaining a letter of approval.

  • Can I stay on site during the house Extension?

    Yes, it is normal to live on the site throughout the house extension, however there will be dust and mess and it can slow down the progress as the builders will try to work around your life. If you are not prepared to live with the disruption, then you should surely look for temporary accommodation especially during the dusty stage.

  • Do I need to inform building control of my house extension?

    Yes, before you commence your construction project, you will need to submit either a building notice or a full planning application to building control. A building notice will allow you to start the work quickly but there will be lack of protection that a building control has signed off on the construction work. In this case, you will be liable to correct any work that faults to meet building regulations standard upon inspection.

  • Building regulations in Harrow

    Regardless of whether planning permission is required or not, any sort, any construction project must comply with the building regulations. You need to make sure that whoever undertakes the work can self-certify the work, for example, FENSA accredited window fitters, Gas Safe engineers, NIXEIC registered electricians and so on. If these requirements are not met, you could be served notice to take the extension down and will have trouble selling your home without relevant building regulations certificates.

  • How to brief an architect before starting our project?

    Before starting your house and kitchen extension, its vital you give as much information as possible on what you want from the house extension, your timings, how and when you intend to pay them and what penalties will be in place if deadlines are missed. The architect will send you a detailed plan and a contract to sign.

  • How to get Structural engineer calculations?

    If your house extension requires any structural changes to your home, you may need a structural engineer. A structural engineer can provide the technical drawings and calculations which can be used to get building regulation approval. This will also be used by the construction company during the house extension work.


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