Basement Conversions

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Requesting a survey is a simple process, call us free on 0800 622 6573 or complete a service request by Clicking Here we are open 7 days a week.

There are various methods to help create a prefect living space by performing a basement conversion. Cementious tanking and epoxy systems can be used to achieve a conversion but ideally cavity drain membrane applications far exceed performance and potential lifetimes.

Which should I choose?

Cementious systems / epoxy systems are great option for when areas are limited and drainage cannot achieved.

Why use these options?

This is a Single component, polymer modified cement “tanking” system for walls and floors. It provides an effective way to damp proof brickwork, concrete or any cementitious substrate.

Is every application the same?

Dependant on the surface the application needs to be correctly prepared. This includes:

  •  Surfaces being free from loose materials.
  •  Floors by direct application.
  •  Wall applications should be applied within a sandwich approach between the sand/cement render coats.

Please note Fillet Seal is a pre-packed, cement based and polymer modified product for use to form a “floor to wall junction seal” during waterproofing works when using cementitious slurry coatings and renders. Fillet Seal helps to ensure a smooth transition between horizontal and vertical surfaces which minimises the risk of leaving gaps or holes unsealed during the waterproofing works.

Which properties would benefit from having this treatment?

Basement areas, with outer external ground levels often higher than levels internally, can result dampness by lateral penetration.

Additionally with high cost properties the recommendation of such treatments are considered very cost effective within cellar areas if they are to form part of the living space. In order to protect this area this would include internal remedial structural water proofing and associated damp proofing works and re-plastering.

What happens during an inspection?

Our surveyor will investigate the area specified, and conclude a number of options for the property to eliminate dampness. Dependant on findings a variety of options may be provided including a cementatious type chemical vertical membrane or ‘tanking’ application, or perhaps a cavity drain membrane system, which is becoming more popular, involving less initial destruction and preparation works.

What happens when the work is taking place?

When providing the application a series of schedules will take place as follows:

  1. Removal of plasters or renders The cementatious systems normally requires plasters and renders to be removed back to the original masonry, and it may also be necessary at the same time to consider incorporating within the cementatious system (or the cavity drain membrane system) a chemically injected damp proof course depending on the external ground levels or adjoining property levels which will be taken into consideration by our surveyor during his inspection.
  2. Application of render coat Generally cementatious systems require a render coat of washed sand and cement to be applied to the prepared clean brick or stone masonry with the cementatious membrane applied to the surface of the new render as per the manufacturers recommendations in a minimum of two coats (green on green) with suitable overlap detailing between the vertical membrane of the walls with any proposed horizontal membrane depending on floor construction or proposals.
  3. Instalment of sump pump (situation dependant) The cavity drain membrane systems provides an alternative to conventional cementatious tanking systems. Cementatious systems work by holding the water back within the wall structure, the cavity drain membrane system works on the principal of allowing water to continue to penetrate the structure, but controlling the dampness in the air gap and diverting it to a suitable drainage point. Depending on circumstances this could involve the installation of a suitable sump pump which may incorporate a backup and failure warning system. This system does not allow pressure to build up against the internal construction, and the air gap behind the membrane allows the structure to breath ‘and to some extent dry’. Membranes are of plastic, type, and are fixed to the masonry using special damp proof seal plugs, sealing tape and rope, with overlap detailing at junctions, which involves minimal preparation required to the substrate. It is often a requirement when installing cavity drain membrane systems however as mentioned earlier, to incorporate within the programme the installation of a drainage sump pump system which may include a backup pump and failure warning alarm.

The Cavity Pump Systems


The cement based systems including sika and cementitious applications should only be used on cellars and basements that are not at risk of flooding. In the event of this context the most beneficial option is the application of a membrane system.

Water Based Epoxy Coating

  • Two coat system comprising primer and top coat.
  • Epoxy based waterproof coating for walls and floors.
  • Suitable for use as a damp proof finish.
  • Water based formulation safe for use in confined spaces.

Product can be used as a damp proof membrane where none exists or the original has failed, or as a tanking layer in a “sandwich” construction between sand and cement renders. It is also suitable for use as a durable finish.

Product can be applied to most building substrates and to damp surfaces. When fully cured product resists petrol, oil and mild chemicals. Application can be by brush or roller.

What is a water vapour suppressant?

It is a solvent free, two part epoxy resin coating, typically used as a surface damp proof membrane and a water vapour suppressant.

This a great option as a water and water proof barrier for situations beneath raised access floors, in plant rooms and bundled areas.

It is also a great choice for application on damp surfaces, such as sand/cement and cement floors subject to rising damp or containing residual construction moisture. Product can be used as a general purpose coating for surfaces subject to foot and light wheeled traffic. Product can be applied using a brush or medium pile roller onto sound, clean surfaces.

NB: New concrete subfloors or sand/cement screeds should be left for a minimum of seven days to cure before applying this product.

Want a Dry Basement or wish to create greater living space? Why not contact us today for a highly competitive quotation. Group Garage Conversions

Here at pride ourselves on our knowledge regarding Garage Conversions.

We believe we can be your recommended and go-to option as a Garage Conversion Company.

Why use for your Garage Conversion?

  •  Quality and Qualified Yes you could choice the option of using a local builder, a man and a Van, a brand new business that will be considered cheaper than but be careful. If your building work is not 100% fulfilled you could be left in a situation where you have an ingress of water, damp or mould or in the worst case be required by building control to rebuild the conversion.
  •  Competitive Take away all and any risk and allow the pleasure of providing a highly competitive, fair and reasonable quotation to convert your garage into a suitably dry and perfect living space.

Who is the good who is the bad?

Here are some useful tips to avoid those that are going to cause you stress, money and time.

  1. Trading time: staff have traded for the last 20 years.
  2. Register? : Research if the company is part of a trade association or professional body?
  3. Paying the piper? Can you find evidence of VAT registration.
  4. Number matching: Look at company guarantees? Match the years they can be providing for their guarantee and their time in trading. This should match e.g. Trading 5 years with a 5 year guarantee.
  5. Mobile and on the move: If a company only provides a phone number that is always a mobile. This means you can run the risk of them being too mobile and not finishing your work. It may also mean they are too mobile to return if things go wrong!

The result of any of the above practices will almost certainly be a financial loss for you the consumer.

Our prices include a fully comprehensive 30 year guarantee against defects and dampness.

How long does a Garage conversion take?

At garage conversion we aim to complete all work in less than 21 days. This includes all include all brickworks, electrics, damp proofing and plastering.

Why have a garage conversion?

Answering yes to the following?

  • ‘don’t use my garage a lot’
  • ‘we need more space’
  • ‘We need another room’
  • ‘I need a study’

You may be the ideal person to consider a garage conversion!

Why Choose

  1. We guarantee to provide you with a free quotation and site survey.
  2. We guarantee that the quotation will be competitive with no hidden charges.
  3. We guarantee the conversion will add valuable living space to your property.
  4. We guarantee to complete the conversion to the highest standards possible and leave your property tidy when we are finished.
  5. We guarantee to assist you with the building regulation and planning process while keeping the building inspector informed throughout the conversion process.
  6. We guarantee to provide you with a written schedule of the project start the conversion on time and complete the conversion to the agreed schedule.
  7. We guarantee that you complete payment only when you are 100% satisfied with our work.
  8. We guarantee our work with a 20 year assurance backed ISRT certificate, which also guarantees your initial deposit.
  9. We guarantee all Dampness and humidity elimination.
  10. We guarantee protection against Radon gas.

Building Regulations

Will my garage conversion need building regulations approval?

This is an important element to the process. You will need approval to adhere to building regulations to comply with legalities. This includes obtaining a completion certification after the work has been fully achieved. Consequences of not having his are because local councils can force you to reverse the work you have paid for. Additionally you need to keep this safe and our 20 years assurance backed guarantee, given to you when we complete your garage conversion, in a safe place. This certificate will show new owners that all work was done according to local building control and the insurance certificate will cover the conversion for the remainder of the insurance period.

Would I require planning permission for my garage conversion?

This can be situation specific. Many do not require his element however if necessary we can take this stress away from our customers, complete the application, provide, drawings and liaising with the planning department to get planning for your conversion. This process can take 6 – 8 weeks after the application has been accepted to complete planning. It is worth noting that we have never been refused planning to date. Specification

This is lawfully necessary. An application for approval needs to be submitted to adhere to the Building Regulations must be made before work starts. The submission of a Building Notice is an appropriate way to achieve this.

Permission will need to be sought in all cases and the following points will be considered before permission can be granted. As well as the regulations being met, it is as well to consider the type of flooring you intend to use. will arrange all such permissions.


It will be necessary to make sure the walls and roof are insulated to industry standards. Windows should achieve a ‘U’ value of 2.0 W/m2/K, Wall insulation value should be equal to 0.35 W/m2/K.


To comply with all necessary measurements all windows must incorporate opening vents of an area equal to 1/20th of the floor area of the room, and trickle vents to provide background ventilation of 8000mm2. A window suitable for escape purposes will be required if the new room can only be accessed through another room. The correct balance of ventilation is essential to avoid mould and dampness. Elimination and prevention of mould and dampness is covered by the comprehensive Damp-Proofing.com20 year guarantee.

Wall Thickness

If the existing wall is single leaf construction with piers it must be checked for stability and freedom from defects. If satisfactory it is likely the wall would be considered are experts in wall stability.


A foundation must be provided to carry any additional masonry loads such as a new inner leaf to external walls or to the garage door infill. The condition and suitability of the existing foundation/floor can be checked when the door infill area is excavated.

Weather Resistance

In order to made sure that your property is resistance to all forms of precipitation a wall of single leaf construction must be treated to provide satisfactory resistance to the passage of moisture

The way in which this can be successfully achieved is with the application of a waterproof compound applied on the internal face and incorporated into a floor membrane. The provision of an inner leaf to create a cavity wall will require a cavity tray at the base of the wall.

Floors (new and existing) should also have a suitable damp proof membrane. provides a vapour membrane to protect from dampness and harmful gases such as Radon. The product can be laid directly on existing garage floor slab.

Requesting a survey is a simple process, call us free on 0800 622 6573 or complete a service request by  Clicking Here we are open 7 days a week.

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