Kingston upon Thames, London KT2 6QW quotes@lianconstruction.co.uk

Building repair specialists

Property Repairs London — Structural, Damp & General Building Repairs

Lian Construction carries out practical property repairs across London, from damp-damaged rooms and cracked finishes to structural making-good, patch repairs and general building defects. We focus on finding the cause, repairing it properly and leaving a finish that is ready to use, rather than covering a symptom that reappears within a year. Homeowners, landlords and managing agents use us for everything from a single urgent defect to a full schedule of repairs cleared before a sale, a new tenancy or an insurance deadline. Repairs range from a single afternoon's work to a coordinated programme across several rooms, and we scope each one properly before quoting rather than pricing a repair sight unseen over the phone.

Service overview

Property repair in London

Repairs that address the source

Patch work only lasts when the underlying issue is understood. We inspect surrounding finishes, moisture paths, failed substrates and access constraints before specifying the repair, rather than skimming over a crack or replacing a section of board without knowing why it failed in the first place. A repair that ignores the cause tends to reappear within a year, sometimes worse than before, because whatever was driving the original damage, a leaking gutter, a failed damp course, movement in the structure, is still active behind the new finish. We'd rather spend the extra time diagnosing properly at the start than come back to redo the same repair twice, and we'll always explain what we think is causing the defect before we start work on it, not just what we're going to do to the surface. This matters most with damp and cracking, where the visible damage is often some distance from the actual source, a stain on a bedroom ceiling might originate from a roof detail at the other end of the house, and a crack at ground floor level can relate to drainage or ground movement well outside the room itself. Getting that wrong means paying for a repair that looks fine for a few months and then fails again in exactly the same place, which costs more in the long run than taking proper time to diagnose it correctly from the start. Access constraints factor into the diagnosis too, sometimes properly tracing a leak or a crack means lifting a floorboard, opening a small inspection hole in a ceiling void, or checking a neighbouring property's boundary wall, and we'll explain why that step is needed rather than skipping it to keep the job looking tidier on paper. Timing matters for diagnosis too, some issues, particularly damp linked to seasonal ground movement or condensation linked to heating patterns, are easier to read accurately at certain times of year, and where it's useful we'll say so rather than giving a definitive answer based on a single dry afternoon's inspection.

Suitable for small defects and larger reinstatement

Whether you need a room made good after water damage or a schedule of defects cleared before letting or sale, we can group the work into a clear, efficient repair programme. A single cracked ceiling or a patch of blown plaster can usually be dealt with as a standalone job, priced and completed within days. A wider schedule, several rooms affected by damp, multiple cracks logged in a survey, or a list of items flagged by a managing agent, benefits from being planned as one visit with one set of access arrangements and one point of accountability, rather than dealt with piecemeal over several separate call-outs. We're equally comfortable with either, and we'll tell you honestly if a job is small enough to fit into a single visit or substantial enough to need proper sequencing. For landlords and agents in particular, bundling several repairs into one instruction is usually the more efficient route, since it means one set of access arrangements with the tenant or vacant property, one invoice to reconcile, and one contractor accountable for the whole list rather than several separate people each responsible for a single item on a schedule of condition. Homeowners tend to fall into the same pattern once they've lived somewhere for a while, a list of small jobs, a squeaky door, a hairline crack, a patch of tired paint, that individually don't justify calling someone out but collectively make sense to deal with in one visit. We'll put together a simple list with you at survey stage covering everything you'd like looked at, even the smaller items, so nothing gets left off and forgotten about once the main repair is finished.

Common causes of building defects in London properties

Cracking and damp rarely appear without a reason, and London's clay-rich soil and mixed-age housing stock produce some recurring patterns. Ground movement from clay soils that shrink in dry summers and swell again in wet weather causes seasonal cracking in many London properties, particularly where a mature tree sits close to the foundations and draws moisture from the ground unevenly. Rising damp affects solid-wall Victorian properties with a failed or absent damp proof course, while penetrating damp usually points to a specific defect such as a cracked render, a blocked gutter or missing pointing rather than a general problem with the wall. Condensation and mould are often mistaken for damp coming in from outside, when the real cause is poor ventilation and cold spots, especially in draught-proofed flats with limited airflow. Previous poor repairs cause their own problems too, a hard cement render on a solid brick wall, or mastic smeared over a structural crack instead of a proper fix, often makes the underlying issue worse rather than better. Cement-based render and modern gypsum plaster don't allow a solid wall to breathe the way traditional lime render and lime plaster do, so trapped moisture behind a hard modern coating can push damp sideways into adjoining walls or force it out somewhere else entirely, which is why a repair on an older property sometimes needs a different, more breathable specification than the same repair would on a newer building. Flat roof defects and failed guttering are another recurring source of problems across London's terraced housing stock, since many properties have a mix of pitched and flat roof sections, rear extensions in particular, and a failed flat roof covering or a gutter that's silted up and overflowing can cause damp damage that shows up on a wall or ceiling well away from the actual leak point.

How we diagnose before we repair

Diagnosis starts with looking at the whole picture, not just the defect itself. We check whether a crack follows a straight line along a mortar joint, which usually points to thermal or minor settlement movement, or whether it's stepped and widening, which needs closer attention and sometimes a structural engineer's opinion. Moisture readings are taken at different heights and depths where damp is suspected, since rising damp, penetrating damp and condensation each leave a different pattern and need a different fix. We look above and below a defect as well as at it, a stained ceiling might trace back to a roof detail two storeys up, or a cracked wall downstairs might relate to movement at foundation level rather than anything visible in the room itself. Where the cause isn't straightforward, or where the property's insurers require it, we'll recommend bringing in a structural engineer or an independent damp specialist rather than guessing, since a wrong diagnosis leads to a repair that fails again. We also factor in the age and construction type of the property at this stage, a solid-wall Victorian terrace, a 1960s ex-council block and a timber-framed extension all move, breathe and hold moisture differently, and treating them all the same way is one of the more common reasons a repair from a generalist contractor doesn't hold up. Photographs and simple sketches taken during the inspection help too, both for our own reference once boards or plaster go back up and hide what we found, and for you to keep as a record of what was actually there before it was repaired.

Repairs for landlords, managing agents and pre-sale schedules

Landlords and managing agents typically need repair work turned around fast and documented properly, whether that's a single reactive repair between tenancies or a full schedule of dilapidations at the end of a lease. We can work within void periods to get a property repaired, cleaned and ready before a new tenancy starts, and we're used to coordinating access around sitting tenants where a property is still occupied. Repairs ahead of a sale are a common request too, items flagged in a Home Buyer Report or full structural survey, such as damp readings, cracked renders or minor timber defects, often need clearing before completion or to satisfy a buyer's solicitor. We can work from a survey document directly, pricing each item individually so you can see what's driving the overall cost, and provide photos of completed work for your records or for onward reporting to a freeholder or insurer. Turnaround speed matters more in this context than in a typical homeowner project, a void period costs a landlord rent, and a delayed completion date costs everyone involved money, so we prioritise scoping and quoting these jobs quickly and can often start within a shorter window than a standard enquiry, particularly where the list of items is already clearly defined. For HMOs and licensed rental properties specifically, some repair items overlap with licensing conditions, such as fire-rated doors or fixed wiring defects, and where that's the case it's worth mentioning at enquiry stage so the repair is specified to satisfy both the immediate defect and the underlying compliance requirement in one visit.

When a repair should become a refurbishment

Not every defect stays a small job once it's properly inspected, and it's worth knowing the signs that point towards a fuller refurbishment rather than another isolated repair. If the same defect keeps recurring in the same spot despite previous fixes, patching it again usually just delays the same conversation. If damp or structural movement has affected more than one room, or more than one type of finish, such as plaster, flooring and joinery all showing damage from the same source, a coordinated refurbishment is often more efficient than several separate repair visits. Cost is a factor too, once repair work starts to approach a meaningful proportion of what a fuller refurbishment of the same space would cost, it's worth weighing up whether spending a bit more now solves the problem properly rather than storing up another repair bill in a few years. We'll flag this honestly when we see it, rather than running a string of repeat repair visits that don't actually resolve anything. As a rough guide, if a repair quote is approaching somewhere around half the cost of refreshing the whole room or area properly, it's usually worth at least discussing the wider option, since the finish, and the reassurance that everything in that space has been dealt with together, tends to be better value over time than another isolated patch. There's no pressure either way from us on this, some clients are happy with a good, honest patch repair and that's entirely reasonable; the point is simply that you should be making that choice with the full picture in front of you rather than discovering it later. If you're weighing this decision up on an older property, our property refurbishment service covers the fuller option, and it's worth reading both pages before deciding which route fits your budget and timeframe better.

General building, damp and structural repairs
Repairs for homeowners, landlords and managing agents
Fast scoping for urgent defects
Repair work that can lead into full refurbishment if needed

Signs to look for

Do you need property repair?

  • A crack has appeared or widened recently, particularly if it's stepped, wider than a few millimetres, or runs through brickwork as well as render.
  • Damp patches, musty smells or mould are appearing on walls or ceilings, especially after wet weather or in poorly ventilated rooms with limited airflow.
  • A previous repair to the same spot has failed again within a year or two of being carried out, suggesting the real cause was missed.
  • You've received a survey report, Home Buyer Report or schedule of dilapidations listing defects that need addressing before a sale or lease end.
  • A leak or water ingress has left visible staining, bubbling paint or soft plaster that hasn't yet been properly made good, or which keeps reappearing after redecoration.
  • A rental property has defects flagged during a routine inspection or by an outgoing tenant that need clearing before the property is re-let to a new occupier.
  • Render, pointing or a damp proof course looks visibly failed, cracked, crumbling or missing in places on an older solid-wall property.
  • You're not sure whether an issue is cosmetic or genuinely structural and want a proper inspection before committing to a repair, rather than spending money on the wrong fix.

How the work is handled

  1. Step 1Inspect the defect
  2. Step 2Explain the repair options
  3. Step 3Protect the work area
  4. Step 4Repair, finish and clean down

Coverage across London

Lian Construction is based in Kingston upon Thames and covers all 32 London boroughs plus the City of London for property repair work.

Local coverage

Property repair in your borough

Dedicated property repair pages for our priority London boroughs, with local landmarks, access notes and typical property types for each area.

Questions

Common property repair questions

Can you deal with damp-damaged plaster and ceilings?

Yes. We repair water-damaged plasterboard, ceilings, walls and finishes after the source of damp or leakage has been resolved, replacing anything that's too saturated or weakened to save rather than skimming over it.

Do you take on smaller property repair jobs?

Yes. We can help with focused repair jobs as well as larger refurbishment and reinstatement projects, and we won't push a small job into a bigger scope than it needs.

How quickly can you get to an urgent repair?

We prioritise scoping urgent defects fast, particularly for landlords and agents dealing with an active issue such as a leak or a safety-related crack. Get in touch with details and photos and we'll assess how soon we can attend, and where the situation genuinely can't wait, we'll aim to look at it before booking in less urgent work already in the diary.

Can property repairs turn into a larger refurbishment if more is found?

Yes. If we uncover a wider issue, such as damp tracking further than expected or a substrate that needs full replacement, we'll explain what we've found and reprice before continuing, and the work can roll into a fuller refurbishment if that makes more sense.

Do you work directly with letting agents and landlords managing multiple properties?

Yes. We regularly repair properties on behalf of managing agents and landlords, including clearing schedules of defects before a new tenancy or a sale.

Will a repair match the existing finish, or will it look patched?

It depends on the surface and how well the surrounding finish has aged. Plaster and paint can usually be blended in so a repair isn't obvious once decorated, but on external render, brickwork or older tiling, a perfect colour and texture match isn't always possible, particularly where the surrounding material has weathered unevenly and faded differently over many years of exposure. We'll tell you honestly before starting if we think a repair is likely to be visible, rather than promising a flawless result we can't be certain of, so you can decide whether that's acceptable or whether a wider area needs treating for a more even finish. Internal plaster repairs are generally the most forgiving, since paint covers a multitude of small variations once it's dry, while natural materials like reclaimed brick, stone or old handmade roof tiles are the hardest to match exactly because the originals have weathered and faded over decades in a way new material simply hasn't yet.

Do you provide a written report or photos for insurance or a landlord's records?

Yes, we can provide photos of the defect before and after repair, which is useful for insurance claims, landlord records or reporting back to a freeholder or managing agent. For anything requiring a formal engineer's report, such as a structural insurance claim, we'll coordinate with the relevant specialist, since that kind of report needs to come from someone qualified to give it rather than from the contractor carrying out the repair itself. Keeping a simple photo record as work progresses, not just before and after, is also useful if a dispute ever comes up later about what condition something was in or what exactly was done to fix it.

Can you repair a crack in a wall, or does that always mean structural work?

Most cracks are cosmetic or related to minor, normal movement such as seasonal expansion and contraction, and can be repaired without structural work. Some, particularly stepped cracks, cracks wider than a few millimetres, or cracks that run through brickwork rather than just plaster, need a closer look and sometimes a structural engineer's assessment before repair, since filling a genuinely structural crack without addressing the movement behind it is only ever a temporary fix. We'll flag which category a crack falls into before quoting the repair. A useful thing to note yourself in the meantime is whether the crack is still moving, a simple pencil mark or piece of tape across it will show whether it's widening over the following weeks, which is useful information for us or an engineer to have.

How do you price repair work if the extent isn't clear until you start?

We price what we can see and assess at survey stage, and flag clearly where the true extent of an issue, such as how far damp has tracked behind a wall, might only become apparent once we start opening it up. If more is found once work begins, we stop, explain what we've found with photos, and agree a price for the additional work before continuing, rather than proceeding on the original figure and adjusting the invoice at the end without warning. This is particularly common with damp repairs, where the visible staining might only represent a fraction of how far moisture has actually tracked behind the surface, so we build a sensible checking point into jobs like this rather than assuming the first impression is the full picture. It's a similar story with timber decay behind old skirting or floorboards, where the surface can look sound while the wood underneath has softened, and we'd rather flag that possibility upfront than let it come as a surprise once the job is underway. Where timber decay is found, we'll also check whether it's simple wet rot from ongoing moisture, which usually stops once the source is fixed and the area dries out, or something that needs a wider look, since the two are treated quite differently.

Do you carry out repairs identified in a Home Buyer Report before a sale completes?

Yes, this is a common request from both buyers and sellers. We can work through a survey report item by item, pricing each defect individually, so you know what each repair costs rather than paying for a vague lump sum. Turnaround before completion is often tight, so it's worth getting in touch as soon as the report is available rather than waiting until close to exchange, particularly if any item might need a specialist such as a structural engineer or damp surveyor involved before we can start. Where the report flags several minor items across the property, it's often more efficient and no more expensive to group them into a single visit than to treat each line of the report as a separate call-out. Buyers sometimes use survey findings to renegotiate price rather than insist on repairs before completion, in which case getting a firm, itemised quote from us gives you a genuine figure to work from in that conversation rather than a rough estimate from the survey document itself, which surveyors often deliberately price on the cautious side.

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Send the site address, photos if available, and the service you need. We can review the scope and arrange the next step for work in London, Kingston upon Thames and surrounding boroughs.

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