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House extensions in London

We provide bespoke house, kitchen and side return extension building projects to both the public and private sectors with minimum disruption, on time and on budget.




When your kids are growing, you eventually need a bigger house for everyone to have private space. However, that can be too costly especially if you are thinking about moving house. Well, why move house if you have a cheaper option?

House extension is a more practical means to add space to your home. Aside from being more affordable, your family can also avoid the hassle of moving. Nevertheless, you need to consider a lot of things like arriving at the best design concept, getting planning and building permission, and managing the project. This can be a mind-boggling task.

For this reason, you need to contact a trusted property improvement company that provides house extension service.

Extension Builders in london

In London, there is one brand that is most trusted by homeowners when it comes to house extension—and that is no other than Bigness. Our company has been serving the UK households for many years, and we have been the partner of many parents in building comfortable and beautiful homes for their families.

So, what are the reasons why we are #1? Here is a summary:

  • We have experienced house extension specialists
  • We have architects for brilliant designs
  • We use advanced equipment for quick work
  • We use nothing but high class materials
  • We offer cheaper extension services
  • We finish our projects without delays
  • We assist our clients from start to finish

Bigness is London’s best property development service company. We specialise in a varied range of extension projects. Aside from house extension, we provide garage, loft, and basement conversion services as well. We are your one-stop-shop for home improvement.

With all the services we offer, we provide broad and practical solutions. Although we make sure our clients are involved in the project, we guide them in every step so the project will come out excellently. We have skilled project managers who carefully examine the details of our work.


Bigness has professional contractors, engineers, architects, project managers, and other employees. They are highly equipped for their roles through trainings and constant exposure in the fields. They have been in the industry for years, and most of them have worked abroad. In addition, we only hire experienced individuals because we do not want to risk the quality of our services.

Our team maintains professionalism when working on our projects. In the project site, you will find us courteous, friendly, and approachable. We also come on time and work fast because we do not want to miss the target date for finishing each project. That is how we avoid delays. We also make sure that when leaving after work hours, the site is neat and clean. We do not want our clients to be stressed by the mess.


It is our passion to deliver the dream house of our clients according to their expectations. That is why when creating house extension designs, we allow our clients to work hand in hand with our architects. We want them to give us the vision of their new added house wing.

Bigness understands that each project is unique just like the homeowners. For this reason, we carefully listen to them so that we can carry out every single detail they want to be included in the project plan. We do not advise universal designs because we want personal touch for each house extension project. This is the secret why we are effective in finishing each project.


Compared to conversions, constructing house extension is really more expensive. However, this is way cheaper compared to moving house, right?

We do not want budget to hinder our clients from achieving their dream house. Therefore, we come up with solutions that can minimise the project cost. One of the ways we do it is by building connection with material manufacturers so we can get discounted prices. By getting cheaper materials, we can charge our clients less. Of course, we do not compromise quality. We stick to high standard materials because that is what our clients deserve for their money.

Moreover, we purposefully set our prices lower than those of our competitors. Call this a business strategy, but our main reason is giving more affordable options to homeowners who need house extension.


Bigness takes care of clients like family. We treat them with utmost care because they are our bosses. That is why we provide them with all the assistance they need.

First of all, we guide them in the planning process. Our architects help them accomplish the blueprint of their desired output. We want them to be able to express themselves well so we can successfully construct their expected outputs.

Kitchen Extensions in London

We take charge of the requirements for securing building and other permits for kitchen extension. We understand that doing this on their own is a hassle to our clients since they are busy. Also, not everyone is well-versed with processes like this. That is why our project managers also take care of this for them.

Our company also takes responsibility of our project outputs. We provide warranty for the house extensions we work on. We also have company insurance that will ensure the security of our clients.

Home Extensions in London

To know more about the Bigness home extensions in London, please call or visit our office. Our consultants are ready to answer your questions. We can also provide you a non-obligatory quote so you can estimate the budget you need to prepare. You can ask us about permits, warranties, and other legal matters too.

Regarding home extension designs, our architects are available to give advice and plan assistance. You can also ask about the kinds of house extension and which one suits your home best. You can also visit our website gallery so you can check out different house extension designs.

Bigness Construction will gladly take care of your home improvement needs. Read our services page and see what else we can do for your house.

Kitchen and Side Extension Building Services in London

We assure total job commitment and quality Kitchen and Side Extension Building Services that will make any extension that best for the original house. In addition, these new house wings we create are guaranteed to make beautiful kitchens, lofts, or rooms. We combine the visions of our clients and our modern knowledge of house construction and designing.

There are many factors to consider like the size of the space needed and how it will go with the rest of the house. The good news is that people do not have to be stressed by these stuff anymore.

Property Extension Builders in London

Aside from having employees with skills, knowledge, and experiences, we also use nothing but state-of-the-art equipment and technology in doing our house extension projects.

We are often recommended by our previous clients as they are satisfied with how we work. We also provide other services such as loft conversions, basement conversions, garage conversions, garages and outbuildings, landscape and garden work, and many others.

We cover the following locations: Central LondonEast LondonNorth LondonNorth West LondonSouth East LondonSouth LondonSouth West LondonKensingtonChelseaBuilders in KnightsbridgeNotting HillWest BromptonVirginia Water, SurreyCobham, SurreyKeston, LondonEsher, SurreyRichmond, LondonChalfont St. Giles​Radlett, HertfordshireGerrards Cross, Buckinghamshire

We have enjoyed our success due to our passion and ability to combine our clients’ needs and wants with our professional knowledge and years of experience in the construction industry.

Larger jobs will be supervised by a quality control manager who will report to you with regular updates.

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