Damp Proofing Coal Vaults in London
The Benefits of Converting a Basement in London
Getting a basement converted is becoming a more and more popular trend in the UK, especially in London where space is at a premium. With the rising price of property in the UK, more and more homeowners are considering converting their basements into a useable and liveable space rather than upgrading to a larger home. Utilising the space underneath a house has long been a popular option in other countries such as Canada and the US, and now there is a bigger move to convert basements in the UK as homeowners realise how much it can benefit them. Here are some of the main benefits of converting your basement in your London home.
Ideal for City Living
While there are different ways to add space to your home, any homeowner is aware that building into the back garden is often the only option if you want to build an extension on a house. This can often be a very restrictive option that might not always be possible if you are living in a city like London, where space is at a premium and outdoor spaces are often small. Some houses in London don’t even have a garden and you may be lucky to have a small back yard. Because of this, a basement conversion in London is the perfect option for anybody who doesn’t want to give up the small amount of precious outdoor space that they have.
Utilise the Space
Having a basement conversion carried out can be an ideal way to add a surprisingly large additional useable space to your home. Right now, if your basement has not been damp proofed, you may not even be able to use it effectively for storage, which can lead to a huge amount of space going wasted underneath your home. Many basements span the entire ground floor of the property, so when it comes to the ways that you can use it, the opportunities are endless. Some people use a basement for additional storage, while for others it becomes an ideal home office space. Or, you could turn your basement into an additional living room, bedroom, games room, or even a home cinema – the choice is yours.
Make Money
When you consider the price of properties in London, the benefits of getting your basement converted become even clearer. According to experts, getting a basement conversion in the UK capital could potentially increase the value of your home by up to a massive thirty percent. Along with this, you could even make money from your converted basement if you don’t want to sell your house. Depending on the size of your basement, you could turn it into a bedroom with an en-suite bathroom or even an entire apartment with its own entrance that you could rent out to a lodger or offer as tourist accommodation in London.
Improve Energy Efficiency
After having a basement conversion carried out, you will notice that your home is more energy efficient overall. This is because you will need to damp proof and seal the foundations of your home in order to ensure that the new room in your basement is not at risk of damp and flooding. Along with keeping moisture out of the basement, this treatment will also prevent cold air from getting in, which can make a massive difference to the temperature control in your home and make it easier for you to heat your home in the winter without the central heating system working quite as hard. Properties with a basement tend to have fewer external walls that are directly exposed, and getting your basement converted will mean that you need to invest in improved floor and wall insulation.
Space for Your Growing Family
With the current prices of homes in the UK – and London in particular – it’s no surprise that more and more homeowners are looking for new ways to improve the space in their existing property rather than purchasing a new one. Additional space might be necessary if you are thinking of extending your family, but buying a new home might not be in your budget right now. Along with that, buying and moving into a new property can be an extremely stressful process. A basement conversion can give you an entire new floor that you can use for living and storage space, providing you with the extra room you need for an expanding family in the home that you currently live in.
Protect Your Belongings
If you have a lot of belongings and want somewhere to store them, then you might have considered a basement conversion. While there are lots of options for storing items including self-storage units, these can get expensive over time. If all you want to use the basement for is storage, then you will only need to damp-proof it. Once it is damp-proofed, you can put whatever you like in there and it should be well protected. Despite the amount of space that is often available in many basements, if the space has not been damp-proofed or converted into a suitable storage area then you might find that after just a few days or weeks in there, your items have gotten damp and there will be a high risk of mould.
Avoid Structural Issues
The preparation work that goes into getting your basement ready to be converted to a useable room or storage area in your home can also help to protect your property from structural issues. Many homeowners are aware of and prioritise structural issues on the ground floor or the higher floors of the house, but overlook the basement. However, since the basement is so close to the foundation of the property, it’s not uncommon that this is where a lot of structural issues and other problems start. By converting your basement, you can seal the foundations and add reinforcement that will prevent issues from developing in your property over time. Damp-proofing the basement can also be effective at helping to prevent issues like rising damp in the future.
Damp Proofing Coal Vaults – Preparing for a Basement Conversion
Whether you want to convert a large basement into a living space or have a small coal vault that you’d like to be able to use for additional storage, there are several ways that you can do this. The two most popular ways to damp proof your basement or coal vault are to either apply a waterproofing slurry or tanking product or have a cavity membrane system installed.
Damp Proofing Coal Vaults in London With Tanking Slurry
Tanking is a process that involves applying a waterproof slurry to the walls of the basement or coal vault. The purpose of this is to seal the walls and floor and prevent any moisture from entering. It is typically the best option if you have low-level damp problems in the space. However, it can be a big job to carry out as there is a lot of preparation work involved. Firstly, you will need to make sure that all coatings that are currently on the walls such as existing rendering, plaster, paint, wallpaper, and more are completely removed and that it is stripped back to the original masonry substrate. You may also need to prepare the masonry for the slurry to be applied beforehand by repairing any cracks and holes in the bricks, repointing, and using a salt-neutralising product. Without the right preparation, there is a higher risk of damage once the slurry has been applied as the water pressure can build up and cause issues if the walls are not strong enough and in good enough condition to withstand it.
London Coal Vault Conversion – Damp Proofing With Cavity Membrane System
Another option to consider when it comes to damp proofing your basement or coal vault conversion is to use a cavity drain membrane system. A high-density studded plastic membrane is applied to the basement floor and walls, and in some cases the ceiling. Unlike the slurry, which is applied directly to the wall substrate, this option allows for a cavity to be left behind the membrane that ultimately allows any water that does get in through the walls to be drained away to the cavity underneath the floor membrane, where it eventually drains away completely from the basement and outside away from the foundations via a drainage system.
You may also need to have a sump pump installed to aid with this. If your basement or coal vault has severe damp problems or is prone to flooding issues, this might be a better option for you compared to tanking. Along with this, having a cavity drain membrane system installed requires less preparation work beforehand. This system is designed to withstand larger amounts of moisture, so will work better if your basement is prone to damp.
If you have a basement that currently serves as a place to gather dust and cobwebs, then you’re missing out on a lot of space that could be used in your home. In London where space is at a premium, there are lots of great reasons to get a basement conversion.
Equipment Used During Our Surveys
Equipment Used During Our Surveys
Purpose:
Takes comparative moisture readings from walls, ceilings, floors and timber to identify abnormal moisture patterns.
Common Uses / Notes:
Used when investigating rising damp, penetrating damp, condensation and leaks. Readings support the survey but are not a diagnosis on their own.
Subsurface Moisture Meter
Purpose:
Detects moisture beneath the surface of suitable building materials.
Common Uses / Notes:
Helps determine whether moisture is confined to surface finishes or extends into the building fabric.
Non-Damaging Moisture Scanner
Purpose:
Scans surfaces for hidden moisture without causing damage.
Common Uses / Notes:
Ideal for decorated walls, ceilings and flooring where pin testing would be undesirable.
High-Resolution Borescope Camera
Purpose:
Inspects hidden or difficult-to-access areas without opening up large sections of the building.
Common Uses / Notes:
Used beneath floors, inside cavities, behind walls and around pipework to identify damp, leaks, decay and concealed defects.
4K Aerial Inspection Drone
Purpose:
Captures high-resolution images of roofs and other inaccessible external areas.
Common Uses / Notes:
Inspects roof coverings, chimneys, flashing, gutters, valleys, parapets and high-level masonry. Subject to weather, safety requirements and flight regulations.
Atmospheric Humidity Sensor
Purpose:
Measures indoor relative humidity levels.
Common Uses / Notes:
Helps assess condensation and mould risk alongside temperature, ventilation, heating patterns and room usage.
Gas Detection Monitor
Purpose:
Screens for certain airborne gases where unusual odours are present.
Common Uses / Notes:
May detect gases associated with drainage, combustion or flammable substances. Does not replace inspection by a Gas Safe registered engineer where gas appliances or pipework are involved.
Thermal Imaging System
Purpose:
Identifies temperature differences across building surfaces.
Common Uses / Notes:
Helps locate cold spots, thermal bridging, insulation defects and areas associated with concealed moisture. Results always require further investigation to confirm the cause.
Basic Socket and RCD Tester
Purpose:
Performs limited electrical checks during comprehensive surveys.
Common Uses / Notes:
Can identify basic socket wiring issues, AC voltage and RCD operation. It is not an Electrical Installation Condition Report (EICR).
Chemical Vapour Testing Device
Purpose:
Screens for airborne volatile organic compounds (VOCs) and formaldehyde.
Common Uses / Notes:
Used where chemical odours, emissions from materials or indoor air-quality concerns are suspected after leaks or refurbishment.
Fine Air Particle Counter
Purpose:
Measures airborne particulate matter (PM1.0, PM2.5 and PM10)
Common Uses / Notes:
Assists with investigations involving dust, smoke, mould concerns, post-construction contamination and indoor air quality following water damage.
Extraction and Air-Movement Tester
Purpose:
Measures the performance of extractor fans and mechanical ventilation systems.
Common Uses / Notes:
Used in kitchens, bathrooms and utility rooms to identify poor ventilation that may contribute to condensation and mould growth.
Survey Levels and Equipment Provided
Basic Moisture Survey
Standard price: £299 + VAT
Special offer: £199 + VAT until the end of this month
The Level 1 survey provides a basic assessment of the main accessible internal surfaces. It is most appropriate for simple, localised damp concerns where advanced testing is not required.
Equipment Included
- Professional damp meter
Survey Checks
- Accessible walls
- Accessible floors
- Ceilings
- Visible plumbing and drainage leak inspection
- Damp-control and prevention information
Suitable For
This survey is suitable for a customer who has found an isolated damp patch, suspects rising damp in a limited area or wants a straightforward check of the property’s accessible surfaces.
Only a standard damp meter is included. Customers requiring deep moisture detection, timber inspection, thermal imaging or roof inspection should select a higher survey level.
The survey fee will be deducted if we carry out the recommended work.
Damp, Moisture and Timber Survey
Standard price: £399 + VAT
Special offer: £299 + VAT until the end of this month
Level 2 includes everything in the Level 1 inspection and adds deeper moisture detection, non-invasive scanning and timber assessment.
Equipment Included
- Professional damp meter
- Deep-reading moisture meter
- Non-invasive moisture scanner
Survey Checks
- Accessible walls, floors and ceilings
- Visible plumbing and drainage leak checks
- Subsurface moisture readings
- Non-invasive scanning of appropriate materials
- Accessible underfloor and subfloor checks
- Wet rot inspection
- Dry rot inspection
- Woodworm inspection
- Damp prevention information
Suitable For
This level is intended for customers who require a more detailed inspection of dampness and timber condition. It is appropriate when moisture may be concealed within building materials or beneath accessible flooring.
The survey may identify evidence of timber decay or wood-boring insects and assess moisture in locations that cannot be properly examined with a surface meter alone.
Level 2 is particularly useful for homebuyers and sellers who want more information about damp and timber before completing a transaction.
The amount paid for the survey will be deducted from repairs undertaken by us.
Full Damp and Property Condition Survey
Standard price: £499 + VAT
Special offer: £399 + VAT until the end of this month
Level 3 is our most detailed inspection. It combines the checks from Levels 1 and 2 with advanced diagnostic technology, ventilation measurements and external roof-level assessment.
Equipment Included
- Professional damp meter
- Deep-reading moisture meter
- Non-invasive moisture scanner
- Thermal imaging camera
- Indoor humidity sensor
- HD borescope camera
- Airflow and ventilation tester
- 4K inspection drone
- Socket and RCD testing device
Survey Checks
- Accessible walls, floors and ceilings
- Visible plumbing and drainage
- Deep moisture investigation
- Non-destructive moisture scanning
- Accessible floor voids and subfloors
- Wet rot, dry rot and woodworm
- Infrared thermal imaging
- Indoor relative humidity
- Extractor-fan performance
- Borescope examination where suitable
- Visible damp-proof course
- External brickwork and pointing
- Roof coverings and junctions
- Chimney stacks and flashing
- Guttering and rainwater systems
- High-level exterior areas
- General visible structural condition
- Basic Electrical Test, socket and RCD screening
- Drone photographs, subject to safe flying conditions
Suitable For
The Level 3 survey is recommended for buyers, sellers and existing owners who want the most extensive moisture assessment available.
It is especially useful for older properties, houses with several reported defects, basement buildings and cases involving damp, mould, leaks, poor ventilation, timber decay or roof problems.
The inspection considers the property as a connected building rather than examining only the visible damp patch. A roof or gutter defect, for example, may allow water to enter at a high level and appear some distance away internally.
The drone component provides valuable information about roofs, chimneys, parapets and guttering that cannot normally be seen from the ground. These areas may contain hidden repair costs capable of affecting a property purchase.
Identifying damage before buying can help the purchaser budget correctly, request further specialist advice or use the findings during negotiations. Even a relatively small roof defect may cost more to repair than the difference between the survey packages.
If we complete the recommended remedial work, your survey payment will be credited against the price.
Specialist Survey Add-On Services
For complex damp investigations, we offer three specialised laboratory and environmental testing add-ons:
Laboratory Analysis of Plaster Samples
Price £299 + VAT
Description: Small plaster samples are extracted from affected masonry walls and submitted to an independent testing laboratory. The lab analyses the sample for hygroscopic salts (specifically nitrates and chlorides).
Value: Scientifically differentiates true rising damp (which deposits ground salts over time) from surface condensation or lateral penetrating damp. Ensures that remedial recommendations are based on chemical analysis rather than surface meter readings alone.
This service can be beneficial when:
- The cause of low-level dampness is disputed.
- Moisture-meter readings are inconsistent.
- A property has undergone previous damp-proofing.
- Old plaster continues to attract moisture.
- Independent laboratory evidence is required.
- Several possible moisture sources are present.
Note: Salt analysis is only one part of the investigation. Results must be assessed alongside the location of moisture, condition of the masonry, external ground levels, damp-proof course and potential plumbing or rainwater defects. Requires minor invasive plaster sampling (the only add-on requiring material removal). Survey fee credited when repairs are completed by us.
Mould Identification & qPCR DNA Testing
Price £299 + VAT
Description: Surface swab samples are collected and sent to an accredited laboratory for advanced qPCR DNA analysis. Identifies exact mould species, measures spore concentrations and detects hidden fungal growth behind furniture, within void spaces, or under floorboards.
Value: Provides precise scientific data regarding mould toxicity and contamination levels, helping establish the exact scale of cleaning, drying and structural remediation needed.
Laboratory mould testing may be useful when:
- There is an unexplained musty odour.
- Visible mould repeatedly returns.
- Water damage occurred previously.
- Mould is suspected behind cupboards or furniture.
- Contamination may be present in a concealed location.
- The visible extent of growth is uncertain.
- Independent results are needed.
- Remediation work is being planned.
Note: The results can provide a clearer indication of whether contamination appears minor, concentrated or potentially widespread. This information may be used when deciding the scale of cleaning, removal, drying or remedial work required. Testing should be combined with an investigation of the moisture source. Removing visible mould without resolving the underlying condensation, leak or ventilation problem may allow it to return. Survey fee credited against subsequent remediation works completed by us.
Air Quality, Gas, Vapour & Airborne Particle Screening
Price £299 + VAT
Description: Comprehensive environmental air testing including:
- Indoor environmental quality – IAQ
- Volatile organic compounds – VOC and TVOC
- Formaldehyde – HCHO
- Fine airborne particles – PM1.0, PM2.5 and PM10
- Dust and smoke particles
- Sewer gases – H2S, NH3 and CH4
- Flammable gases – CH4 and C3H8
- Carbon monoxide – CO
- Hydrogen sulphide – H2S
- Ammonia – NH3
- Oxygen measurement – O2
- Ventilation and stale-air assessment
- Drain-smell investigation
- Chemical-odour investigation
- Air checks following a leak or flood
- Combustion-related screening
- Building-material off-gassing assessment
- General airborne pollutant monitoring
Value: Pinpoints invisible airborne hazards, toxic sewer gases, chemical off-gassing and foul odours resulting from damp or trapped water.
This service can assist when investigating:
- Persistent foul smells
- Suspected sewer or drain odours
- Chemical smells
- Stale indoor air
- Odours following water damage
- Possible stagnant water
- Building material emissions
- Fine dust after construction work
- Poorly ventilated rooms
Note: Unpleasant odours can have several possible sources. Measurements for specific gases, compounds and particles may help identify which source requires further investigation. The assessment is a screening service and does not replace specialist gas-safety, environmental or medical testing where this is necessary. Survey fee credited against subsequent repair works completed by us.
