Damp Survey and Damp Proofing in Olney

Olney's High Street and Market Place are lined with limestone and brick buildings of real age, and the Great Ouse runs along the edge of the town, so both historic construction and water levels come into the assessment. Procure Group Ltd carries out damp investigations, mould and condensation assessments, timber and woodworm inspections, water damage reinstatement advice and below-ground damp assessments throughout Olney, Emberton, Clifton Reynes and the MK46 area. We measure and inspect before recommending anything, and we say what the evidence supports.

Much of Olney's older housing is solid-walled: local limestone rubble, brick, or render over stone, bedded in lime mortar and built without a damp-proof course. These walls were designed to absorb and release moisture. The recurring causes of persistent damp in the town are therefore the things that stop them doing so, along with ground levels that have risen over the centuries so that pavement and yard surfaces now sit above internal floor level. Hard cement pointing, cement render on stone, modern impermeable internal finishes and rainwater goods discharging against a wall base account for the majority of what we find.

The Great Ouse and its flood plain define the lower part of the town, and properties near the river, the mill and the water meadows can be affected by a high water table, by surface water and, in the more serious events, by flood water entering ground floors. After a flood the important question is not whether a wall is wet but how wet, how deep the moisture has penetrated and how the structure is drying, because premature reinstatement traps moisture behind new plaster and finishes. We record moisture profiles at depth, advise on drying, and set out when reinstatement can safely begin.

Away from the historic core, the estates built from the mid-twentieth century onwards and the more recent development on the town's edges are cavity-walled and modern. Their problems follow the familiar modern pattern: cavities bridged by mortar debris or slumped retrofitted insulation, cold bridges at lintels and reveals, and condensation and mould where airtightness and insulation have been improved without matching moisture removal. Distinguishing that from a fabric defect takes half an hour of measurement and observation, and it decides whether the remedy is building work or a change in how moisture leaves the building.

Timber assessment carries particular weight in flood-affected and older buildings. Joist ends bearing into wet stone or brick, ground-floor timbers over damp sub-floor voids, and staircases and skirtings that have been submerged are all at risk of wet rot, and dry rot becomes a genuine possibility where timber stays damp in an unventilated space. Older roof structures frequently carry historic beetle flight holes that no longer represent live activity. We measure moisture content, identify the decay type where present, and state clearly whether structural members are affected.

Damp surveys in Olney

An evidence-led investigation of what is making the wall wet, with readings and findings you can act on.

Damp proofing in Olney

Where a damp-proof course has genuinely failed, the appropriate remedial specification for the wall in question.

Mould removal in Olney

Professional remediation of the contamination, and control of the moisture conditions behind it.

Condensation control in Olney

Humidity, ventilation and surface temperature measured before any equipment is recommended.

Below-ground damp protection in Olney

Damp at or just below external ground level investigated, with localised protection where remediation calls for it. We do not install basement or cellar waterproofing.

What we do in Olney

• Damp investigations
• Rising damp assessments
• Penetrating damp investigations
• Condensation control
• Mould remediation
• Timber preservation
• Woodworm investigations and treatment
• Wet rot investigation and repairs
• Dry rot investigations
• Damp-resistant plastering
• Internal wall insulation
• External damp-related repairs

Nearby towns

• Newport Pagnell
• Wellingborough
• Wolverton
• Stony Stratford
• Bedford
• Kempston

Related advice

• What moisture meter readings can and cannot establish
• Condensation versus rising damp
• Why air bricks and subfloor airflow matter

Frequently asked questions

Our Olney property was flooded. When can we replaster?

Only once the structure has actually dried, which usually takes considerably longer than the surface suggests. Solid stone and brick walls hold moisture at depth long after they feel dry to the touch. We take readings at depth as well as at the surface, monitor the drying, and advise when reinstatement can begin. Replastering too early is the single most common reason a flood-damaged wall stays damp for years afterwards.

Is a limestone building treated differently from brick?

Yes. Limestone rubble walls with lime mortar are permeable by design and often rely on a lime render or limewash finish to shed water while still allowing the wall to dry. Cement-based repairs and modern paints on that construction trap moisture and can accelerate decay of both stone and mortar. Our recommendations use compatible, breathable materials and concentrate on shedding water away from the wall rather than sealing it in.

Do you cover Emberton, Clifton Reynes and the surrounding villages?

Yes. The MK46 area and the villages around Olney are within our working area, along with the rest of the Milton Keynes area and neighbouring Northamptonshire and Bedfordshire.

Will you tell us if no work is needed?

Yes, and we do so regularly. A good number of the properties we inspect need maintenance rather than damp proofing: gutters cleared, a gully unblocked, ground levels lowered, a leaking waste pipe repaired or an extract fan replaced. Our fee buys an evidence-led diagnosis, and an honest finding of nothing structural to treat is a perfectly ordinary outcome.

This page was last reviewed by the Procure Group survey team on 17 September 2026.