Extension Builders London

Welcome to Firtree Building Services! We are the best team of house extension builders London has got to offer. Our team of London house extension and loft conversion building experts will stop at nothing to give you the design renovation you most desire. 

Here at Firtree Building Services, we are entirely dedicated to offering each and every one of our London clients the design renovation they need for their house extension or loft conversion. No matter whether your next London house extension includes an extra kitchen or even a new storey, our design building specialists have got you covered.

We are the premier team for loft conversion design here in London. So, if you would like to learn more about our range of added kitchen or storey design plans for your new loft conversion, please contact our London team on 0800 270 7764 to find out more.  

Difference Between Home Extensions and Loft Conversions

There is one key difference between the design plans of home extensions and loft conversions. A loft conversion will work with the surface area of your house in order to expand its design, while a house extension will add on that area and design a new room without altering others. For instance, a loft conversion will change the design layout of your house to fit a new bedroom, while a house extension can be used to expand your kitchen outwards.

Benefits of House Extensions

There are a multitude of benefits to choosing a house extension built by Firtree Building Services. These benefits include:

  • More Space
  • Save Money on Moving Out
  • Increased Property Value
  • More Flexibility to Add Different Rooms

More Space

House extensions are perfect for you in case you need extra room in your house or property since it expands the area of your property. Whether you need a larger kitchen, bedroom, living room, or bathroom, your needs will definitely be tended to. Regardless whether you choose a single- or double-storey loft extension, the space that the house extension builders offer adds plenty of extra space to your property.

Save Money on Moving Out

Moving out of your house is an expensive process because there are so many costs to consider. Investing in an expansion rather than a new home can be more cost-effective because you only have to fund the extension and not the following:

  • Paying Off Final Bills
  • Survey Fees
  • Valuation Fees
  • Stamp Duty
  • Land Registry Fee
  • Local Authority Searches
  • Mortgage Fees
  • Solicitor’s Costs
  • VAT
  • Removal Expenses
Extension Builders in Camden

Increase Property Value

The home extensions you offer your home add more value to your house and make it more attractive for buyers that are looking for a house with extra space. The house extension builders we have here will do their absolute best to make your home better with the new design that our house extensions offer for your beloved house.

Reliable Extension Builders in London

When working on any kind of building extension project, you have to make sure that the team you are working with is reliable and trustworthy. You will want a structured home extension that is free of any detrimental flaws. This is why many clients defer to us here in London to get their home extensions done professionally. You could add any space you like such as a roof, kitchen, loft, etc. Any design you would like to be done can be discussed within the renovation process with our house extension builders.

The extension project with us is simplified and straight to the point. Our years of experience has left us with a great deal of knowledge. The home extensions carried out by our team are executed with precision and finesse. So, if you choose our London house extensions team, you will always be satisfied by the outcome of our efforts.

Bespoke Home Extension Types

We are professional house extension builders in London with years of experience in creating house extensions for our clients. As professional house extension builders in London, you can always be at ease that the design of your home extension is done properly.

Whether you would like to work on a loft, roof, kitchen, building, or anything else, the design of your home extension will be done to your requirements, and you can always make changes during the renovation process. While building your home extension here in London, our house extension builders will adhere to the choices you settled on.

Of course, we pick our house extension builders carefully in order to offer you only the best house extensions you can find in London. Our extension builders are the best team of house extension and renovation building workers in all of London.

There are three types of a house extension available – single-storey, double-storey, and loft conversions. Read on to find out more about these types.

Single-Storey Extension

For people who desire additional living space downstairs, a single-storey extension is ideal. This could range from a larger kitchen and eating area to a more spacious lounge area for entertaining visitors. We will collaborate with you to design a bespoke single-storey expansion that meets your needs and specifications.

Double-Storey Extension

When you need more space both downstairs and upstairs, a double-storey extension is the way to go. This is frequently a combination of a larger kitchen and dining area on the main level and additional bedrooms and a larger bathroom on the second level. Many homeowners with a growing family choose a double-storey extension, and as your London extension builders, we can design and build a bespoke extension for you.

Double-Storey Extension

When you need more space both downstairs and upstairs, a double-storey extension is the way to go. This is frequently a combination of a larger kitchen and dining area on the main level and additional bedrooms and a larger bathroom on the second level. Many homeowners with a growing family choose a double-storey extension, and as your London extension builders, we can design and build a bespoke extension for you.

Loft Conversions

If you don’t have enough outdoor room to expand your home, you might be interested in our loft conversions. Lofts are sometimes overlooked and are used for storage, but they have an abundance of untapped potential. They can be modified to create additional living space for homeowners, including bedrooms, baths, home offices, and more. We can carry out three different types of loft conversions:

  • Internal Loft Conversions
  • Dormer Loft Conversions
  • Roof Off Loft Conversions

Our Proven Building Process

Homeowners require extensions for a variety of reasons, which is why we provide a tailored solution. You might discover that you need a much larger kitchen to cook food and a family dining space to eat together. If your family is expanding, you may require additional bedrooms and bathrooms to accommodate everyone. However, if you find yourself working from home more frequently now, you may only need a home office.

Whatever your reason for needing an extension, we will be able to accommodate you. We can develop any area you desire with our services as skilled extension builders in London.

House Extension Duration and Cost

While there are numerous aspects that can influence the cost of an expansion in London, the most essential consideration is the extension’s size. This is because the project’s size (which is usually measured in square feet) is directly proportional to the total cost.

As a result, you should have a fairly precise estimate of the size of the place you want to create or change.

When deciding on the size of your addition, there may be planning policy problems to consider. Your architect will be able to tell you the maximum size that is likely to be allowed under authorised development laws (if applicable) or through a planning application for your property.

We can begin estimating expenses using some common square metre rates after you know the required size of your project.

You may expect to pay between £1,200 and £1,500 per square metre (£110 and £140 per square foot) elsewhere in the UK.

Structure extensions can take 10-12 weeks to complete on average, but this relies on a number of factors, the most important of which is the size of the building as well as the project specifications — a large build can sometimes take longer. If you look at some of our finished work in London, including districts like Highbury and Holloway, you’ll notice that the projects were rather large, with kitchens, restaurants, bathrooms, and even underfloor heating.

While these projects were completed in a matter of months, it is impossible to predict how long your extension will take. When you schedule a consultation with Firtree Building Services, we’ll be able to provide you with an estimate depending on the amount of work you’d like us to do on your house, as well as an estimate for how long it will take to build an extension. A project manager will oversee every step of the construction process, and any changes in the timetable will be communicated to you immediately.

What’s Included in the House Extension Package?

We will take care of everything during the construction process as the number one house extension builders in North London, so you don’t have to worry about a thing. For all house extension builders services given, this comprises the following:

Architectural Planning (We Will Suggest Architects)

Structural Calculations

Construction Phase

Final Sign-off Complete With Certificates

House Extension Builders

You won’t have to worry about anything with our all-in-one solution. While our house extension construction crew constructs your new extension, you may focus on other things.

Whether you work with an architect or a designer, our specialised house expansion builder team will take their ideas and make them a reality. If you haven’t built your home from the ground up, this is your chance to add your personal touch. All extensions will be tailored to your preferences.

Homeowners forget that moving out (especially to a different area) comes with a whole myriad of issues that are not always paperwork-based. Local amenities are very important to a property, and you may find that you miss having a corner shop when you need to go out for a pint of milk.

House Extensions in Harrow

Other Types of Extensions

In addition to the above additions, Firtree Building Services can also carry out various other sorts of extensions for our clients. Outbuildings and orangeries are included, and you may learn more about them further down.

Outbuildings and Orangeries

For our clients, our skilled extension builders in London can also design and construct sheds and orangeries. An orangery is a brick construction with big windows and a glass roof, which is similar to a conservatory. If you want a peaceful area to unwind or a location to entertain visitors, an orangery is a great option. We will collaborate with you to design a custom orangery that meets all of your needs.

Outbuildings are wholly independent structures that are placed on your land, usually in the garden. We will ensure that your outbuilding is of the finest quality, whether it is a storage unit or a home office. Your outbuilding will be fully equipped, with plumbing and electricity if desired, and will be built to your exact specifications.


If you’d like to see some of our earlier work, visit our gallery page. Many photographs showing our remarkable results across a range of building services may be found here.

Why Choose Us as your Go-to Extension Builders London Residents?

We are a competent team of builders with many years of experience in the field here at Firtree Building Services. We’ve accumulated a wealth of expertise and worked on numerous extension projects for a variety of clients over this time, so we’ve previously handled all requirements. This guarantees that whatever additional requirements you have, we will be able to meet them and deliver excellent service.

Building extensions are something Firtree Building Services has a lot of expertise within London. With over 20 years of experience, we have a reputation for quality and efficiency as house addition builders. Our team of experts will construct each extension to last.

Our company is a member of Which? Trusted Trader and FMB, both of which are industry-recognised accreditations. You may rest assured that if you choose Firtree Building Services, you will receive nothing less than an excellent service. Every expansion will be built to last and will be made of the highest quality materials available.

If you’re interested in our house expansion builder service, you’ll like the fact that we offer free consultations. This will give you the opportunity to ask our staff questions and determine whether an extension is appropriate for you, your home, and your budget. Our team of house addition builders has worked on extensions of all sizes in London and the surrounding areas.

All additions (both loft and home extensions) come with a ten-year guarantee for your peace of mind. Your designers, architects, or structural engineers will collaborate with the house extensions builder team to make your new expansion a reality.

Contact Our Professional Extension Builders Today

While there are many construction companies in London that can complete a property extension, none can match everything we have to offer. We are the best team of expansion builders London has to offer because of our experience and knowledge.

So, to learn more about our service, give us a call on 0800 270 7764 and speak with one of our representatives. You can also contact us by filling out our online form or sending an email to info@firtreebuild.co.uk, and we will get back to you as soon as possible.