Three-Storey House Damp Survey in Catford (SE6)

(The cost of this add-on is credited against remedial work completed by us).

Plaster samples are carefully taken from affected walls and sent to an independent laboratory for detailed chemical analysis. The laboratory measures the presence and concentration of hygroscopic ground salts, including chlorides and nitrates.

Why it matters: Ground moisture carries soluble salts through masonry, which remain trapped in plaster after water evaporates and continue drawing moisture from the air.

Diagnostic value: Differentiates true rising damp from condensation, rainwater penetration, or historic plumbing leaks.

Note: Salt results cannot be considered in isolation. The surveyor will also assess external ground levels, wall construction, ventilation, plumbing, rainfall exposure and any visible damp-proof course. As physical material must be collected, minor holes or damage to the plaster will be necessary. This is the only optional test involving invasive sampling. The cost of the survey will be credited against remedial work completed by us.

(The cost of this add-on is deducted from the final repair cost when we undertake the recommended work).

Swab or lift samples collected from affected surfaces are analysed by an accredited laboratory using advanced qPCR DNA testing methods.

Why it matters: Identifies exact mould species, calculates spore contamination levels and reveals concealed mould growth invisible to visual inspection.

Diagnostic value: Establishes whether mould contamination is minor or widespread, guiding environmental remediation and ventilation strategies.

Note: Results can help determine whether the samples show relatively minor contamination or evidence of a more extensive mould condition. This information may assist with the planning of cleaning, removal and remediation measures. Mould testing does not remove the need for a moisture survey. The water source, humidity problem or ventilation defect supporting the growth must also be identified and corrected. When we undertake the recommended work, the survey amount will be deducted from the final cost.

(The survey fee is deducted if we complete the resulting remedial work).

A broad indoor air quality, gas and particulate screening service tailored to specific client concerns or property conditions.

Testing Options: 

• Indoor air-quality assessment- IAQ
• Volatile organic compounds- TVOC/VOC
• Formaldehyde- HCHO
• Fine airborne particles- PM1.0, PM2.5 and PM10
• Dust and smoke particles- PM1.0, PM2.5 and PM10
• Sewer gas screening- H2S, NH3 and CH4
• Flammable gas screening- CH4 and C3H8
• Carbon monoxide- CO
• Hydrogen sulphide- H2S
• Ammonia- NH3
• Oxygen levels- O2
• Stale-air and ventilation assessment- IAQ and TVOC
• Drain odour investigation- H2S, NH3 and CH4
• Chemical smell investigation- TVOC, VOC, HCHO and NH3
• Post-leak air and surface-condition checks- PM2.5 and TVOC
• Combustion gas screening- CO, O2 and CH4
• Building-product off-gassing assessment- TVOC and HCHO
• General pollutant screening- PM1.0, PM2.5, PM10 and TVOC

Diagnostic value: Damp buildings can sometimes develop air-quality problems that are not visible. Wet materials, microbial activity, slow-drying water damage and insufficient air exchange may contribute to unpleasant indoor conditions.

Note: Foul smells can result from several different sources, including damp building materials, contaminated water, drainage defects, sewer gases or chemical vapours. Targeted measurements can help narrow down the possibilities and guide any further specialist investigation. This service is intended as property-condition screening. It does not replace specialist assessments by environmental consultants, Gas Safe engineers, occupational hygienists or medical professionals when these are necessary.