Reclaim Your Basement From The Damp With Basement Tanking
It’s a sad truth that despite the high prices of London real estate, many homeowners aren’t using their living spaces to their fullest potential. London’s soggy ground and wet climate have caused many residents to just give up on their basements, which are all too often a damp, dark place that is the domain of spiders and other creepy crawlers! It’s really a shame, surely they would like to have the extra room be usable, wouldn’t they? In most cases, they just give up and shut the door, but it doesn’t have to be that way- let’s find out what can be done to save the basement!
The first thing to do is to summon the expert help of an independent damp surveyor in London who can identify the source of the damp that has turned your basement into a boggy mess! They can then advise you on ways to transform your basement into a pleasant, dry space that is habitable and inviting.
The best way to save your basement is with a process called tanking, let’s take a look at how it works!
Basement tanking is a method of waterproofing that can prevent the cold damp from ever creeping in. The ground water under and around your home is always trying to push its way inside by seeping through microscopic cracks in the walls, powered by a force called hydrostatic pressure. Basement tanking protects your basement from the ground water’s push by making the space watertight. Just think of your basement as a fish tank pushed below the water’s surface, the glass will keep the water outside!
The basement tanking process begins with an independent damp survey of your basement to locate the source of the encroaching moisture that has turned it into a wet, inhospitable cave. Once the extent of the damp’s ingress has been assessed, any existing water, damaged wall paper or plaster, and patches of mould and mildew will be removed, revealing the surfaces that the tanking system will be affixed to.
The following are the two main types of tanking systems:
Membrane Tanking – If your independent damp surveyor recommends this method, a waterproof basement tanking membrane will be affixed to the floor and walls to create an impermeable physical barrier against the damp attempting to penetrate the structure. This sturdy and flexible membrane form fits to the corners to provide complete moisture protection within.
Cementitious Tanking – A specially formulated cement-based coating adheres seamlessly to the basement’s surfaces, creating a robust barrier that is impervious to the damp, it will keep the water from penetrating for decades.
At London Damp Specialists, our qualified surveyors utilise cutting edge technology to diagnose damp issues, so our inspections are always performed to the highest standard. If you have a rising damp problem, just call London Damp Specialists on 020 7523 5882 and we will dispatch an independent damp surveyor near you to help ascertain your damp problem.
Damp Survey Costs
Transparent pricing with no hidden fees for our independent, unbiased surveys.
Level 1
What’s included:
- Inspection of walls
- Inspection of floors
- Inspection of ceilings
- Leak inspection of drains and plumbing
- Damp information and prevention guide
Level 2
What’s included:
- Everything in Level 1
- Dry rot inspection
- Wet rot inspection
- Woodworm inspection
- Damp information and prevention guide
Level 3 (Most Popular)
What’s included:
- Thermal Imaging
- Air humidity testing
- HD boroscope camera
- Brickwork pointing inspection
- DPC inspection
- Ventilation flow test on extractor fans
- 4K drone imagery roof, chimney stack
and guttering inspection - Structural condition inspection
- Inspection of walls
- Inspection of floors
- Inspection of ceilings
- Leak inspection of drains and plumbing
- Dry rot inspection
- Wet rot inspection
- Woodworm inspection
- Damp information and prevention guide
Survey Add Ons
Add On 1
Laboratory analysis Of plaster identifies hygroscopic salts such as chlorides and nitrates. which indicate whether damp is caused by rising groundwater or by plumbing leaks, This testing removes guesswork, allowing the exact source of moisture to be identified so the correct treatment is applied rather than carrying out unnecessary damp-proofing work.
Add On 2
qPCR DNA mould testing detects microscopic mould spores that are invisible during a normal inspection and van remain hidden behind walls, floors. or inside building rkaterials. It identifies the exact mould species present and the contamination level, allowing hidden mould problems to be confirrned and properly treated before they affect the property or occupants’ health.
Qualifications: All our surveyors are PCA and CSRT qualified for remedial treatments and also CSSW qualified for structural waterproofing.
Next day report: You will receive the report within 24 hours of the inspection taking place.
These are the tools we use
Damp Meter
A damp meter is a diagnostic tool used to detect and measure moisture levels within building materials such as plaster, brick, timber, and concrete.
Borescope camera
borescope camera is a small inspection camera attached to a flexible semi-rigid cable that allows you to see inside areas that are otherwise inaccessible.
Drone Inspection
A drone is a remotely operated aerial device equipped with a camera that allows visual inspection from above without the need for scaffolding or ladder.
Air Humidity Sensor
Air humidity sensor measures the amount of moisture present in the air, expressed as relative humidity (RH) in percentage. It helps determine whether indoor conditions are contributing to condensation, mould growth, or damp-related issues.
Thermal Imaging Camera
A thermal imaging camera detects temperature differences on surfaces by using infrared technology to produce a heat map image. In damp investigations, it helps identify cold spots, moisture intrusion, insulation defects, thermal bridging and leaks.
Air Flow Ventilation Detector
An air flow ventilation detector measures the movement and volume of air passing through vents, extractor fans, and air bricks. It confirms whether ventilation systems are working properly and achieving adequate air changes within a room. Poor airflow leads to trapped moisture, high humidity, condensation on cold surfaces, and ultimately mould growth.
Mould Lab Swab Testing
A mould swab test is carried out to confirm the presence of hidden mould growth and identify the specific species involved. Surface mould is not always visible, especially behind furniture, inside cavities, or within ventilation systems. Laboratory analysis of a swab sample determines whether active mould spores are present and what type they are, which helps assess potential health risks and decide the correct remediation approach rather than relying on visual assumption alone.
Lab Analysis of Plaster
Laboratory analysis of plaster is used to identify the type of salts present within the material, typically chlorides and nitrates. The presence and concentration of these salts help determine whether the moisture source is consistent with rising damp, ground contamination, or another forms [sic] of water ingress. such as mains water leak, This removes guesswork and prevents misdiagnosis, ensuring the correct remedial treatment is specified rather than applying unnecessary or ineffective solutions.
Professional Survey Equipment
Surface Damp Meter
Purpose:
Takes comparative surface moisture readings across accessible walls, floors, ceilings and building joinery.
Common Uses / Notes:
Maps surface moisture profiles to help identify rising damp, penetrating damp, condensation, or active plumbing leaks.
Deep-Penetration Damp Meter
Purpose:
Detects moisture changes deep below the immediate surface of structural materials without destruction.
Common Uses / Notes:
Evaluates dampness within wall cores, beneath floorboards, inside subfloors and behind finishes without removing plaster.
Non-Invasive Moisture Scanner
Purpose:
Scans surface planes non-invasively without inserting pins or probes into decorated finishes.
Common Uses / Notes:
Checks decorated walls, tiled surfaces and delicate floor coverings to trace sub-surface water migration non-destructively.
HD Borescope Inspection Camera
Purpose:
Provides high-definition visual examination inside enclosed, narrow, or inaccessible building cavities.
Common Uses / Notes:
Inspects subfloor voids, wall cavities, dry lining and enclosed pipework to locate leaks and defects with minimal disruption.
4K Inspection Drone
Purpose:
Captures high-resolution imagery and video of high-level external structures and rooflines.
Common Uses / Notes:
Inspects roof tiles, chimney stacks, lead flashing, parapet walls, valleys and gutters to locate water ingress sources.
Air Humidity Sensor
Purpose:
Measures ambient air temperature and relative humidity (%RH) levels within living areas.
Common Uses / Notes:
Determines whether atmospheric moisture, cold bridging, or insufficient ventilation supports surface condensation and mould growth.
Thermal Imaging Camera
Purpose:
Visualises surface temperature differentials across walls, ceilings and floors.
Common Uses / Notes:
Detects cold spots, missing insulation, thermal bridges, evaporative cooling zones and concealed water leaks.
Airflow & Ventilation Detector
Purpose:
Measures volumetric air extraction performance (L/s or m3/h) of mechanical extractor fans.
Common Uses / Notes:
Tests kitchen, bathroom and utility fans to verify compliance with UK Building Regulations Part F and control condensation.
Gas Screening Instrument
Purpose:
Screens indoor environments for sewer gas intrusion, combustible gases and combustion concerns.
Common Uses / Notes:
Traces foul odours, soil stack leaks and sewer gases (H2S, NH3, CH4, CO, O2). Does not replace Gas Safe registered safety checks.
Chemical Vapour Detector
Purpose:
Screens air for Volatile Organic Compounds (TVOC/VOC) and chemical substances like formaldehyde (HCHO).
Common Uses / Notes:
Investigates unexplained chemical odours, building material off-gassing, post-flood air safety and indoor air quality.
Airborne Particle Detector
Purpose:
Measures airborne particulate concentrations across precise micron size ranges (PM1.0, PM2.5, PM10).
Common Uses / Notes:
Assesses fine dust, smoke, airborne matter and environmental air quality following water damage or mould outbreaks.
Electrical Socket & RCD Tester
Purpose:
Provides basic safety and protective circuit screening in areas affected by dampness.
Common Uses / Notes:
Identifies socket wiring faults, tests RCD trip functions and checks AC voltage in wet areas. Does not replace an EICR.
Survey Levels & Package Specifications
Level 1
Standard Damp Survey
Standard price: £299 + VAT
Promotional Price: £199 + VAT (Limited Time Offer)
The Level 1 service is a straightforward inspection of the main accessible areas for visible damp, leaks and moisture-related defects.
Equipment provided
- Surface damp meter
Inspection coverage
- Accessible walls
- Accessible floors
- Accessible ceilings
- Visible drains and plumbing for signs of leakage
- Damp information and prevention guide
Who should choose Level 1?
Level 1 is suitable for relatively simple concerns, including a visible damp patch, suspected rising damp, minor staining or a general moisture check.
It is intended for customers who require a basic inspection using a damp meter and do not need deeper moisture testing, thermal imaging, timber investigation, ventilation measurements or roof-level drone imagery.
Level 2
Detailed Damp & Timber Survey
Standard price: £399 + VAT
Promotional Price: £299 + VAT (Limited Time Offer)
Level 2 contains the accessible checks included with Level 1 and adds deeper moisture detection and inspections for common timber defects.
Equipment provided
- Surface damp meter
- Deep-penetration moisture meter
- Non-invasive moisture scanner
Inspection coverage
- Walls, floors and ceilings
- Visible drains and plumbing for signs of leakage
- Wet rot
- Dry rot
- Woodworm
- Timber decay
- Deeper moisture investigation
- Non-invasive scanning of accessible floor and subfloor areas
- Damp information and prevention guide
Who should choose Level 2?
This survey is appropriate when moisture may be concealed behind finishes or within building materials. It is also suitable when there are concerns about wet rot, dry rot, woodworm or general timber deterioration.
Level 2 is a useful choice for buyers and sellers who want a more comprehensive inspection than the basic Level 1 service but do not require the complete advanced equipment package or drone inspection included with Level 3.
Level 3
Comprehensive Damp Survey
Standard price: £499+ VAT
Promotional Price: £399 + VAT (Limited Time Offer)
Level 3 is our most extensive standard survey. It incorporates the checks offered by Levels 1 and 2 and adds thermal, environmental, ventilation, concealed-area and high-level external inspections.
Equipment provided
- Surface damp meter
- Deep-penetration moisture meter
- Non-invasive moisture scanner
- Thermal imaging camera
- Indoor humidity sensor
- HD borescope
- Airflow and ventilation tester
- 4K drone
- Socket and RCD circuit tester
Inspection coverage
- Accessible walls, floors and ceilings
- Visible drains and plumbing
- Wet rot, dry rot and woodworm
- Timber condition
- Deep moisture detection
- Accessible floor and subfloor scanning
- Thermal imaging
- Humidity measurement
- Borescope inspection where appropriate access exists
- Brick pointing
- Visible damp-proof course
- Extractor-fan airflow
- Drone imagery where conditions permit
- Roof coverings
- Chimney stacks
- Guttering
- General visible structural condition
- Basic socket and RCD checks
Who should choose Level 3?
Level 3 is designed for homebuyers, sellers and property owners who want the most detailed standard inspection. It is particularly useful when several possible causes must be considered, including roof defects, hidden leaks, dampness, mould, condensation, timber decay and inadequate ventilation.
Roof, chimney and gutter defects can be expensive and may be difficult to see from the ground. A drone inspection can identify visible high-level issues before a purchase is completed, potentially giving the buyer an opportunity to investigate costs or reconsider their position.
Even a comparatively small roof defect may cost more to correct than the price difference between survey levels. Water entering from above can also lead to plaster damage, internal staining, mould and timber decay if it is left unresolved.
Level 3 is therefore the most suitable option for customers who want detailed evidence before buying, selling, repairing or maintaining a property.
Optional Laboratory and Air-Quality Services
Laboratory Testing of Plaster Samples
Price £299 + VAT
Small plaster samples are carefully taken from affected walls and submitted to an independent laboratory for salt analysis. The laboratory tests for the presence and precise concentration of hygroscopic salts, including nitrates and chlorides.
Diagnostic Value: Soluble ground salts are drawn up through masonry during rising damp and remain in plaster permanently. Salt analysis scientifically differentiates true rising damp from condensation or historic leak contamination.
Note: Plaster sampling requires minor material removal and is our only add-on involving minor invasive work.
Mould Laboratory Testing & qPCR DNA Analysis
Price £299 + VAT
Surface swab or lift samples are submitted to an accredited laboratory for advanced qPCR DNA analysis.
Diagnostic Value: Accurately identifies exact mould species, measures contamination concentrations and detects hidden fungal growth inside cupboards or behind dry lining. Delivers impartial scientific evidence to guide safe environmental remediation.
Testing may be helpful when:
- Musty odours persist
- Mould continually returns after cleaning
- Previous flooding or leaks have occurred
- Contamination is suspected behind furniture or within cupboards
- Growth may be concealed in restricted locations
- Additional evidence is required before remedial work
- Occupants have concerns about the internal environment
Results can help establish whether contamination appears limited or more significant and whether it may be connected to an underlying moisture problem. Testing applies to the locations sampled and should be interpreted alongside the property inspection.
Gas, Chemical Vapour & Airborne Particle Testing
Price £299 + VAT
Comprehensive environmental air quality and gas screening tailored to specific property concerns.
Screening Suite Includes:
- Indoor air quality indicators — IAQ
- Volatile organic compounds —
- TVOC/VOC
- Formaldehyde — HCHO
- Fine particles — PM1.0, PM2.5 and PM10
- Dust and smoke particles
- Sewer gas indicators — H2S, NH3 and CH4
- Combustible gas screening — CH4 and C3H8
- Carbon monoxide — CO
- Hydrogen sulphide — H2S
- Ammonia — NH3
- Oxygen concentration — O2
- Ventilation and stale-air assessment
- Drain-odour investigation
- Chemical-smell investigation
- Post-leak air and surface-condition screening
- Combustion gas indicators
- Off-gassing from building materials
- General airborne pollutant screening
Diagnostic Value: Identifies hidden airborne pollutants, drain odours, chemical off-gassing and stale air problems.
Note: This service is intended as preliminary screening. It does not replace emergency gas-leak procedures, professional gas appliance testing, specialist occupational-hygiene assessments or comprehensive laboratory air sampling.
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