At APT Renovation Design + Build, is able to deliver original and creative basement design solutions, an integrated design process, eco-friendly building materials and structure safe excavations, high quality and above all, extraordinary attention to detail.

Find out more about how we can improve your existing basement or cellar space.

Basement Conversion Architectural Design and Build in Hammersmith

Reputed architectural designers and builders at APT Renovation – Design & Build are able to take care of all stages of basement conversion and extension project in your property if you live near in Hammersmith.

Process of basement conversion includes whole planning stages and design process, excavation to construction of the core base and waterproofing finalizing with fit-out and completion.

APT Renovation offer well basement conversion and renovation service.

Our builders are able to undertake the whole fit-out phase of your project. The major benefit of our service that you can work with a single team of specialists under one roof.

Our team Include:

Basment design consultants, Basement Structural architectural designers, Structural Engineers and Builders who have over 10 years of experience as a team in modelling, designing and building beautiful homes across Hammersmith. We can also take care of all aspects including planning applications, project cost estimation, development of detailed designs, and specification of fine materials and finishes.

Nowadays basement extension and cellar conversion are becoming popular among London residents who wish to utilize unused space below ground floor or basement to design and build something pleasant to live. Benefits of basements are tremendous can be useful to create hidden space the boiler, water heater, car park, and smart air-conditioning systems; However, in 2016 London basements are often extended or build with exceptional high standard and add up some value to the property as well.

Newly excavated cellar space can be used in to achieve additional below-ground floor of a home.

Basement renovation in single-family detached houses are becoming more popular in London as long as fits with flood risk assessment. Basements are becoming more strict and complicated to construct in central populated areas of London with neighbor at your property in Hammersmith can help to reduce heating and cooling costs.

Design & Build

Benefits of converting basement space into something liveable and beautiful with a help of qualified architectural designers and fine builders who are able to undertake any cellar extension projects.

Our first contact site visit will be towards starting basement extension works, which during we will be valuating and making sketch plans for quotation of your property in Hammersmith. We will discuss your basement conversion projects requirements and your ideas with you to form a design brief. This brief becomes our main objective. Using our extensive knowledge and experience we will advise you where the design will need to be tweaked to get the most out of your proposal and we will strive to exceed your expectations.

After the initial design approved by you, if required APT Renovation can take care of all the necessary plans etc, we will submit the basement conversion designs for a planning application when required and the building control application.

We will act as agent on behalf of you, so for the most part all you need to worry about is paying the fees and waiting for the decision. We ensure that the designs that go in for the planning application have had the construction thought out and can be built without fundamental modification to the design. If you are looking for home renovation specialist or whether you need basement extension London contact APT Renovation.

Who we are

APT Renovation – Design & Build offer full-service design and build services tailored to suit basement renovation or extension to your personal needs, projects delivered and managed by team of

• Project managers

•architectural designers

• Design consultants

• Quantity Surveyors

• Structural Engineers and professional Builders.

We are one of the very few firms who choose not to ask for deposits or upfront payments.

We take care of everything

APT Renovation offer full-service basement conversion design and build services:

• Architectural Drawings

• Planning applications

• Building Control

• Project cost estimation

• Detailed architectural CAD / 3D designs

• Construction

As well as detailed specification of fine materials and finishes.



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created study room with basement conversion


children playground room


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we can help to transform your basement space


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Start the process of designing and building house or kitchen extension. Call today!

Our design and construction team will help you create a space you will love, delivered on time and on budget.

Let’s Talk House & Kitchen Extensions

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APT Renovation is basement specialist in London who has extensive experience and able to deliver basement conversion requirement on time, budget and meet your expectation.


basement conversion company free site visit

Free a No Obligation Site Visit / Consultation

APT Renovation will visit you at your premises to discuss what would you like to create within your new or existing basement space. We are happy to answer all essential questions you may have during our initial visit.
APT Renovation can offer a full service which includes submitting plans right through to the very last detail, or we are happy to just create your basement conversion project from your already gained plans.
APT Renovation will ensure to send you a quotation within 4 days.

basement conversion company design service

Design Service

If you require a Planning and Design service for your basement conversion project, our in-house architectural designers, Structural Engineer, and Party Wall Surveyor are at hand to help you visualise your plans and go through them with you until you are completely happy with the final ideas. Our primary concern is to make our clients happy, so every process will be explained to you from beginning to end.

basement conversion british standard

British Standard 8102:2009

British Standard 8102:2009 is the ‘Code of practice for protection of below ground structures against water from the ground’. In essence, it is the primary design guide for structural waterproofing in the UK, with the recent update being released in November 2009. If you are producing a waterproofing design, or you have advisors that are designing on your behalf, this document should cover every consideration possible. If you have further questions in regards to the BS8102, please feel free to contact us.

basement conversion tanking and excavation


Tanking, or ‘Type A barrier protection’ (BS8102 definition), is a specific form of waterproofing, although it is a common term applied to all forms of waterproofing. In the true sense of the word, tanking means blocking water out of a structure by employing a barrier product which is installed internally, sandwiched within, or applied externally to a structure. Tanking is still widely employed in new construction, but has declined in popularity in recent years where retrofit protection is required for existing basements.

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An intuitive construction process of all basement conversion projects is monitored and overseen by managing director, Andi Pepaj, and managed by our project managers onsite.

APT Renovation has over 17 years experience in underpinning and basement excavation following standards at very high level finish.

You will be advised by your Project Manager who will be on site all day, every day and will be your first point of contact.

basement conversion company

Health and Safety on every stage

Health and Safety is of the utmost importance on every site that we work on, as it not only concerns all of our staff members, but everyone else in the vicinity; including you, your neighbours in AHammersmith and even passers-by. Due to the nature of our work, there is always the risk of injury or even death, as ladders, tools and various other materials can be hazardous. Basement conversions in particular are technically very challenging, and can pose a number of different risks, with a large proportion of these projects in London regularly failing safety checks. Unguarded excavations and unprotected floor openings represent serious dangers to all those concerned. That is why our staff are expertly trained and will always diligently adhere to all necessary Health and Safety procedures and issues.

basement conversion waterproofing


Waterproofing is a very important aspect in basement conversion, particularly as the UK experiences a very high level of rainfall each year. A lack of waterproofing will eventually result in damp on walls, which not only look bad, but smell bad as well, and can cause significant damage to the paint job, the plastering and the finish. Worse still, damp can also lead to breathing problems and other health issues, so it is something that should be nipped in the bud.

APT Renovation have had huge success over the years in waterproofing with Delta Membrane Systems and pumps. For basement waterproofing, the Delta sealed system ensures that all membranes are expertly sealed and secured, as well as any protrusions or crevices. Delta Systems are incredibly effective in dealing with adverse water conditions and especially have the propensity to flood. There is an offer of a 30-year guarantee on all Delta membrane systems.

Visit the Delta website

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Our construction team will be ready to make the rooms or space in your basement at your house or flat in Hammersmith that you have been dreaming of, come to life. Our dedicated and experienced tradesmen will work tirelessly to complete your project on time with no stone being left unturned. Our aim is for you to be completely happy with the work, and we will only sign off the project once you have deemed it necessary to.

basement conversion company insurance guarantees

Insurance and Guarantees

APT Renovation hold public liability insurance, and an all risks cover. This will cover you and our builders. APT Renovation Ltd offer a 15 year warranty on all structural work.

With hundreds of basement conversion projects completed in London and Hammersmith to date, APT Renovation has an outstanding reputation for being conversion specialists, dedicated to creating state of the art spaces, with immaculate attention to detail.

Upon final completion of project the client will receive following documentation where applicable:

Gas Safety Certificate, Electrical Sign Off Certificate, Drainage Layout, Plans as Built Drawings, Manufacturers Instructions For Appliances, Manufacturers Guarantees For Appliances, 10 Year Structural Guarantee


A Building Inspector will visit at regular stages throughout the project, their job is to make sure that we are adhering to all the latest building regulations. Upon completion of works The Building Inspector will make a final visit and you will be issued with a completion certificate.


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We can take care of all aspects of basement conversion project throughout whole planning stages and design process, excavation to construction of the core base and waterproofing finalizing with fit-out and completion. APT Renovation offer a complete basement space extension and renovation service. Our own construction team will undertake the whole fit-out phase of the project. The major benefit of our service that you can work with a single team of specialists under one roof. These Include:

Design Consultants,architectural designers, Structural Engineers and Builders who have over 10 years of experience as a team in modelling, designing and building beautiful homes across London. We can also take care of all aspects including planning applications, project cost estimation, development of detailed designs, and specification of fine materials and finishes.

APT Renovation is Basements conversion company in based in Balham, London are leading cellar and basement conversion specialists in design and build CAD designs, groundwork, excavation, delta membrane waterproofing, tailored for residential homes. We are bale to convert your existing or new basement space to simply gain extra space or whether it is comfortable living space such as entertainment area, playground for children and wet rooms to the extend even building a swimming pool s and gym, We have vast experience to create outstanding living space beneath your property.


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