How Much Value Does a Basement Conversion Add?

Does Converting a Basement Add Value?

The simple answer is that yes converting your basement can increase the value of your property. Basement conversions are known to provide a great return on investment in cost-effectiveness. However, some factors come into play.

The basement conversion cost can range between £2,500 and £3,000 per meter depending on the level of finishes you choose. It's important to consider the value of your property per foot before making such an investment. For example with rising property prices in London renovations like basement conversions have become increasingly valuable, over the years.

Converting your basement can be a way to maximize the use of your space. However, it's not suitable for everyone as it depends on factors such as your property, budget, and goals. For instance, transforming an existing cellar tends to be more cost-effective and less complicated compared to excavating a basement.

While having the advantage of space is a perk it's important to keep in mind that there is a limit to how much value it can add to your property. Sometimes no matter how luxurious or elaborate your basement conversion may be it can be challenging to exceed a value threshold.

No matter what plans you have and what budget you are working with seeking advice, from real estate agents is crucial when considering the feasibility of investing in a basement conversion. We advise you to contact your local estate agent in your area to discuss more about the costs and increase in value.

What Percentage Can It Boost By? 

There's no reason why your basement conversion shouldn't significantly increase the value of your home. It's widely acknowledged that it can boost your property's worth by, around 10% to 20%.

It's crucial to consult a real estate agent to get an accurate estimate of how much the changes will add in value as the expenses can vary depending on factors like the property's individual worth and the specific area.

If no major modifications are required the cost of your basement conversion will generally be lower. In some cases, the overall cost per meter is usually comparable, to that of a loft conversion. According to a recent study by Independant, it says 20% to 30% is added once a basement is completed to the highest livable standard.

Is it Worth Finishing a Basement?

Finishing a basement is a renovation option that not only adds extra space but also enhances comfort and boosts property value. It's a way to make your living environment more enjoyable. When considering materials and features, for your basement it's important to prioritize meeting your family's needs. Additionally, it's wise to keep prospects in mind as you may want to sell your property. 

What are the expenses involved?

One of the reasons why basements are not as popular, as loft conversions or rear extensions is because of the effort required to complete them. However, with the right team like Basement Conversion London, this process can be made easier. We can work with you to manage your budget and guide you through the process from the start till the completion.

A crucial step in finishing any basement is addressing dampness and creating a barrier against moisture infiltration. This might entail adding drainage systems and moisture-resistant insulation. Additionally, it may be necessary to install ventilation and heating controls in the basement. Therefore it's important to consider not only the costs associated with creating spaces according to your preferences but also the expenses involved in completing the basement at a high standard. These costs will play an important role in determining how profitable any potential increase in property value might be in the long run.

Impact Assessment Before Basement Conversion

Due to the increasing popularity of basement conversions and extensions, many local councils across various London boroughs require the submission of a Basement Impact Assessment as part of the planning application procedure.

Preparing all the information for a Basement Impact Assessment can be quite expensive and usually requires the assistance of a property surveyor. It is important to budget for this cost and have a discussion with your local real estate agent before commencing your basement conversion project.

If you are considering undertaking a basement conversion project you must consult with your local real estate agent beforehand. They will be able to provide advice on the feasibility of your investment and guide you through all the required obligations. 




Guest Lounge



Swimming Pool


Wine Cellar


Kids Room


Tanking and Waterproofing

Tanking is the superior building technique for underground structures that effectively controls water infiltration from the external soil. Our method utilizes draining channels to remove excess water, while a robust tank surrounds the walls and base of the basement, protecting it from infiltrations. We employ top-of-the-line cavity drain membranes, channel drains, and sump pumps, installed redundantly with alarms to ensure flawless operation. Our secondary pumps take over when the primary fails, while alarms signal any issues with the correct functioning of the pumps, such as battery exhaustion. Waterproofing is an essential component of any structure, underground or overground, to prevent dampness caused by water infiltration. At Basement Conversion London, we pride ourselves on our in-house expertise to design and implement the latest technologies and the most effective waterproofing systems, ensuring your basement is built to last.

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Planning and Permitted Development Requirements

In , permitted development for basements is strictly limited to non-substantial alterations. Any excavation for a basement must have planning permission, which requires a complex application process involving extensive documentation, reports, investigations, and specific conditions unique to basement conversions. However, the approval rate for basement conversion planning applications is typically very high, as councils frequently grant permission. While the result is predictable, the application process is longer and more costly than standard extension applications, such as loft conversions or rear extensions.


Shell-and-Core and Fit-Out

When it comes to converting a basement, choosing the right basement conversion company in is crucial. With Basement Conversion London, you have access to a pool of highly specialized basement builders for every stage of the project. Our construction project manager is also a structural engineer, ensuring that the final structure of your basement is not only safe and solid, but that the entire process is carried out with maximum safety and control.


During the shell-and-core phase, we excavate and extend the volume of your basement, using temporary supports to protect your existing structure. The result is a waterproof, reinforced concrete box that forms the external structure of your basement. We only work with subcontractors who have a proven track record of successfully damp proofing basements. Trust Basement Conversion London to deliver a basement conversion that is safe, reliable, and built to last.


The subsequent stage is the fit-out, comprising of electrical and plumbing work, wall construction, flooring, lighting, plastering, and painting. With Basement Conversion London, you need not fret about locating the suitable tradespersons for each task. Our project manager will oversee everything and keep you informed on the project's status, schedule updates, and decision making at the appropriate juncture. They will assist you in clarifying your necessities and making decisions throughout the fit-out's duration until it is finished.


Do you have a question about Basement Conversion in ? Below we have listed the most frequently asked questions.

  • Why Should I Convert my Basement in ?

    If you have outgrown your home and are finding it difficult to move due to the current housing market, a basement conversion may be the perfect solution for you. By adding a whole new floor to your home, you can create a luxurious space for a home gym, cinema room, bedroom, bathroom, entertainment area, or even a swimming pool. Don't hesitate to invest in a basement conversion if you need extra space but don't want to move. It will completely transform your home and give you the space you need to live comfortably.

  • Is Planning Permission Required for a Basement Conversion?

    Planning permission may be required for a basement conversion in , depending on the situation. However, building regulations must always be followed. Our expert basement contractors will guide you through the entire process and handle all necessary applications for planning permission and approvals.

  • Do I need to have an existing Basement?

    You do not require an existing basement for your conversion. Basement Conversion London has the expertise to construct your basement from scratch and can provide guidance on the options available for your property.

  • Do I need to move out during the Construction Process?

    Clients are not required to move out during the construction of their basement. It is completely optional and up to their preference. However, it is possible for clients to live at their property during the conversion process, even when heavy work is being carried out.

  • What is Basement Waterproofing?

    Basement waterproofing is a crucial process that effectively halts water damage in below ground areas of your property in . Our team of basement waterproofing specialists are equipped to determine the most suitable waterproofing system, based on the construction, and intended use of the area. Trust us to provide the necessary solutions to protect your property from water damage.

  • Are Basement Conversions in worth it?

    A basement conversion in is an excellent solution to expand your property and boost its value by 10-15%. If you already have a basement, it's a wise decision to make. Don't hesitate to add extra space to your home with a basement conversion.

  • How long does a Basement Conversion in take?

    A basement conversion project in typically takes several months to complete. We confidently handle all necessary permits and permissions, ensuring a seamless process from start to finish. Simple basement conversions can take just a few weeks to complete, however, basements conversions that require digging out, pumping, floor lowering, and a number of other things can take a number of months to complete. Basement Conversion London will work with you closely to ensure you understand the timeframes involved for each stage of the basement conversion project.

  • Are there any specific building regulations that need to be followed when converting a Basement in ?

    Converting a basement in requires strict adherence to building regulations. Safety codes, fire regulations, and structural requirements must be met without compromise to ensure a legal and successful conversion.

  • Can a Basement Conversion in add value to my property?

    Undoubtedly, a basement conversion in will add significant value to your property. By creating additional living space, you will appeal to a wider range of potential buyers and increase the overall value of your home. Don't hesitate to invest in this valuable upgrade that will pay off in the long term.

  • How much does a Basement Conversion in cost?

    The cost of basement conversion in is determined by various factors, including the scope of work, size of the basement, and addition of natural lighting. Our pricing strategy is tailored to each client, ensuring that they receive a competitive quote that meets their specific requirements. Rest assured that we offer a decisive and efficient approach to basement conversions.

  • Do you need a pumping system for a Basement Conversion?

    Absolutely! If you've experienced basement flooding in , then it's imperative that you have a drainage and pumping system installed before proceeding with your conversion. Moisture levels in basements can be unpredictable, which is why a sump pump is the most reliable choice for ensuring your basement stays dry and protected. Don't take any chances - invest in a pumping system for your basement conversion today.