Damp Specialists For Period Properties In Hampshire

Almost every pre-1919 property in Hampshire has solid walls – no cavity, no modern damp proof course, no impermeable membrane. Moisture management depends entirely on the wall absorbing small amounts of water and releasing it again through breathable lime mortar, breathable lime plaster internally, and breathable lime render externally where present. When that system is broken, damp follows.

Hampshire is chalk country, and flint is the dominant traditional walling material across much of the county. Flint walls hold a substantial body of lime mortar between the cobbles – the mortar is doing significant structural and moisture-management work. When that mortar has been replaced with cement, or has weathered and failed, flint walls develop their own characteristic damp problems: moisture accumulating between the flints and the impermeable cement, salt staining on internal faces, and a wall that can no longer manage the water it absorbs.

Hampshire’s surviving medieval and Tudor timber-framed buildings depend on the breathability of their wattle-and-daub or lime-plaster infill panels, and on the ability of the whole structure to release moisture. Cement render applied over a timber frame, or modern impermeable infill panels, traps moisture against the historic timber – accelerating decay in exactly the structural elements that matter most.

Across Hampshire’s period stock, patios, drives, paths and landscaping have often been raised over the decades until they sit above the original DPC line – or above the lowest course of breathing masonry where there is no formal DPC. This bridges the building’s defence against ground moisture and is one of the most common causes of “rising damp” diagnoses in the county. It is not rising damp. It is a fixable external issue.

Period properties across Hampshire typically have suspended timber ground floors over ventilated voids, with airbricks around the perimeter. When those airbricks are blocked, painted over, rendered across or buried by raised ground levels, the void stops venting, moisture accumulates beneath the floor, and damp rises into the lower walls. The fix is to restore ventilation – not to seal the floor.

Winchester above all, but also Romsey, Petersfield, Alresford, Titchfield, Wickham and dozens of village conservation areas across the county carry significant listed building stock. Listed status changes the legal framework around damp work – chemical injections and waterproof renders are increasingly unlikely to be consented, and using them inappropriately can breach existing consent and create liability for the owner.

Blocked or leaking gutters, cracked downpipes, failed flashings around chimneys and parapets, raised external ground levels above the original DPC line. The first thing we look at on every Hampshire survey is where rainwater is actually going. On flint properties especially, failed pointing in the flint work allows water directly into the wall body – and on the chalk downland, exposure to driven rain finds every weakness in the external envelope.

Probably the single most common cause we encounter in Hampshire. Cement render applied during the post-war decades to Georgian, Victorian and earlier properties – across Winchester, the market towns, the flint villages – traps moisture inside the masonry. Internal damp follows as the wall pushes moisture inward. Removing the cement and reinstating lime is often the single most effective intervention possible. We documented exactly this work on a Georgian property in Hook, where the cement had bonded so aggressively to the soft brick that pieces of the brick face came away with it.

Properties that have had basement tanking, cementitious waterproof render or impermeable membrane systems applied internally tell the same story across Hampshire. The wall can’t release moisture, salts accumulate behind the system, and eventually the surface fails or the damp emerges above the tanked line. We remove failed tanking and reinstate breathable lime.

Particularly common in properties that have been heavily draught-proofed during recent decades – sealed chimneys, blocked airbricks, gypsum-skimmed walls, modern double-glazing replacing leaky sashes. The building can no longer ventilate, and moisture from daily living condenses on cold internal surfaces. The damp pattern looks like rising damp at the base of walls, but a chemical injection won’t fix it.

In suspended-floor properties, blocked airbricks prevent the void from venting and moisture accumulates beneath the floor. In timber-framed buildings, trapped moisture from cement render or impermeable infill panels accelerates decay in the historic frame. Both have the same root cause – the building can’t release moisture – and the same fix: restore breathability.

Call 0800 037 9063 or submit an enquiry. We’ll come back to you to understand what you’re experiencing, what’s already been tried, and whether a heritage damp survey is the right next step.

A specialist surveyor visits the property and carries out a diagnostic assessment. There is a fee for the survey, which reflects the time and expertise involved.

A specific written report with our findings and recommendations, plus an itemised quotation. You’re under no obligation to proceed.

If you go ahead, we schedule the project, agree start dates, and our team carries out the work. Qualifying works are backed by our 10-year workmanship promise.

Almost always, the cause of the damp wasn’t identified before the treatment was applied. Standard damp treatments – chemical injection, internal tanking, waterproof render – assume the cause is true rising damp. In most period properties in Hampshire, the actual cause is something else entirely: cement render trapping moisture, a bridged DPC, blocked subfloor ventilation, failed flint pointing, or condensation. The treatment seals over the symptom but leaves the cause in place, so the damp reappears.

Genuine capillary rising damp through solid masonry does exist, but it’s far rarer than the damp-proofing industry suggests. In the period properties we’ve surveyed across Hampshire, the cause of “rising damp” diagnoses has almost always been something else – bridged DPCs, cement render, blocked airbricks, failed pointing, or condensation on cold internal walls. A specialist heritage survey identifies which of these is actually occurring.

If your property is listed, work that affects its character or fabric typically requires listed building consent. The good news is that the kind of work we carry out – removing inappropriate modern materials and reinstating lime – is generally what consent expects. Where consent is needed, we can prepare specifications and method statements that support the application. We work with conservation officers across Dorset regularly.

Flint construction has its own characteristics. Flint walls carry a substantial body of lime mortar between the cobbles, and that mortar does significant moisture-management work. When flint walls have been repointed in cement, or when the original lime pointing has failed, moisture accumulates in the wall body and emerges internally as damp. Flint properties need a contractor who understands flint construction specifically – the diagnosis and the remediation both differ from solid brick or stone.

If your property is listed, work that affects its character or fabric typically requires listed building consent. The good news is that the kind of work we carry out – removing inappropriate modern materials and reinstating lime – is generally what consent expects. Where consent is needed, we can prepare specifications and method statements that support the application. We work with conservation officers across Hampshire regularly.

It varies significantly with scope. A focused single-room remediation typically starts in the low thousands. A full-elevation cement render removal and lime re-render is a larger investment. We provide a specific written quotation after the survey so you know exactly what you’re investing and what you’re getting. We never quote without seeing the building.

Smaller projects – single-room remediation – typically run two to four weeks. Larger projects involving cement render removal and lime re-rendering typically run four to eight weeks depending on scale and weather. We programme sensitively around drying times, the weather, and the household’s logistics.

Usually, yes. Most damp remediation projects in Hampshire are carried out with the owners in residence. Dust protection, daily clean-downs and careful sequencing keep disruption manageable. For more extensive projects we’ll discuss logistics during the survey.

Yes – Bramley & Stone holds public liability insurance up to £5 million. Insurance and indemnity details can be provided on request before any work begins.

Damp proofing is the application of a barrier – chemical, physical or cementitious – to stop moisture reaching a surface. Damp remediation is the identification and removal of the actual cause of damp. The distinction matters because damp proofing is designed for modern construction, and damp remediation is what heritage buildings need. Damp proofing a period property in Hampshire usually makes the problem worse over time.