A vacant property can start attracting problems quickly, especially in London streets where a dark window, a full letterbox or an overgrown front step gets noticed. We see this with probate houses, empty rental flats between tenancies, shops waiting for refit, and buildings caught up in long insurance claims.
Boarding up a door or window has its place, but it is only one part of proper vacant property security. If the locks are poor, the water is still on, the electrics are unsafe, or the roof is letting rain in, the property is still exposed. The cost can move from a simple security visit to thousands of pounds in damage, lost rent, insurance trouble and emergency call-outs.
The right approach is plain enough: secure the entry points, make the services safe, remove the easy signs that the place is empty, and check it regularly. Below is how we usually talk a London homeowner, landlord or business through the job before we put tools on site.
Why Vacant Property Security Matters Beyond Boarding Up
Most break-ins at empty properties are not clever. They usually start with an easy weakness: a loose basement grille, a timber rear door with tired hinges, an old night latch, a slipped sash window catch, or scaffolding that gives access to a first-floor window. In Kensington and Chelsea, many properties have rear additions, flat roofs, side passages, lower-ground entrances and old timber windows, all of which need checking rather than guessing.
There is also the building itself to think about. A small leak under a sink can run for days if nobody is living there. A failed roof tile above a top-floor flat can soak ceilings before anyone notices. If the heating is off through a cold spell, pipework in a loft, rear outrigger or unheated basement can freeze and split.
Insurance is another common issue. Many UK policies change conditions once a property is empty for more than 30 days, sometimes 45 or 60 days depending on the insurer. They may require weekly inspections, water isolation, alarm use, letterbox management or specific lock standards. If you have not followed those terms, a claim after a break-in or escape of water can become awkward very quickly.
Walk the Site and Record the Weak Points
Start with a proper walk-round, not just a look at the front door. We check the front, rear, side passage, basement lightwells, roof access, garden gates, sheds, garages, meter cupboards and communal entrances. In converted Victorian and Edwardian houses, the rear is often weaker than the street side because old timber doors and low roof sections have been altered over many years.
Take dated photos of each elevation, every door, every accessible window and any existing damage. This helps with insurance, landlord records and later repair planning. If there has already been an attempted entry, avoid touching damaged locks or frames until you have photographed them and spoken to your insurer or the police if needed.
A basic security inspection may sit around £90 to £180 plus VAT for a small flat or shopfront, while a larger house, commercial unit or building with roof access can take longer. If keys are missing, locks are damaged or there is a safety concern, expect additional costs for urgent lock replacement, making-safe works or a second trade attending.
Secure the Doors Before You Worry About Extras
Doors are normally the first job because they take the most abuse. A decent front door should have sound hinges, a firm frame, proper strike plates and locks that suit the door construction. On many London flats, we still find old night latches doing too much work, especially on communal conversion buildings where doors have been repaired several times.
For timber doors, we often look at British Standard BS 3621 deadlocks or suitable insurance-approved alternatives. For uPVC and composite doors, the cylinder should be correctly sized and resistant to snapping, and the multipoint mechanism needs to engage smoothly rather than needing force. If the frame is split near the keep, changing the lock alone is not enough.
Typical costs vary. A straightforward cylinder change may be around £85 to £160 plus parts, a BS 3621 mortice lock supplied and fitted can often be around £160 to £280, and repairing a damaged timber frame may range from £180 to £450 depending on how much carpentry is needed. Emergency attendance out of hours will usually cost more, so it is better to deal with weak locks before the property is visibly empty.
Protect Windows, Basements and Rear Access Properly
Windows are not all equal. A modern high-level window may only need checking and locking, while a lower-ground sash window into a lightwell may need extra attention. We look for loose catches, rotten sills, cracked panes, missing restrictors, weak beading and anything reachable from a bin, wall, flat roof or scaffold.
Boarding should be fitted where there is a real risk, not just screwed randomly across the front of a property. External plywood boarding, fixed into masonry or solid framing, is stronger than a thin board fixed into weak old timber. For a single broken window, temporary boarding might cost roughly £120 to £250 depending on size and access, while multiple openings, shopfronts or high-level work can run from several hundred pounds upwards.
Basement areas need particular care in central and west London. Lightwell gates, coal-hole covers, cellar doors and external staircases are common weak points. If the property has a shared freehold or managing agent, check permission before adding grilles, shutters or visible external changes, especially on listed buildings or properties in conservation areas.
Make Gas, Water and Electrics Safe
Security is not only about keeping people out. It is also about stopping the property from damaging itself while nobody is there. If the building is empty for more than a short gap between tenancies, water, gas and electrics need a practical plan.
Water can usually be turned off at the internal stopcock, but we always check that the stopcock actually works. Older London properties often have stiff valves under kitchen sinks, shared risers in converted houses, or poor labelling in communal plant cupboards. A plumber may charge around £90 to £160 plus parts to replace a simple accessible stopcock, but more awkward pipework or shared supply issues can cost more.
Gas work must be carried out by a Gas Safe registered engineer. If appliances are being isolated, capped, serviced or checked after a period of vacancy, do not treat it as DIY. For electrics, a competent electrician should inspect any damaged wiring, exposed fittings, old consumer units or systems affected by damp. Rental properties should have a valid EICR, usually at least every five years in England for most private rented homes, and electrical work in certain areas falls under Part P of the Building Regulations.
If you need help making services safe, it is sensible to use one firm that can coordinate the trades. Kensington Maintenance Services Ltd can arrange plumbers, electricians and Gas Safe engineers, including practical checks through our plumbing services, electrical services and gas engineers where appropriate.
Remove the Obvious Signs That Nobody Is There
A vacant property should not look abandoned. Full letterboxes, old takeaway leaflets, bins left out for weeks, dark windows every evening and uncollected parcels all give the wrong message. In mixed residential and commercial streets, these signs get spotted quickly.
Arrange mail redirection or regular collection, clear flyers, keep the frontage tidy and make sure bins are brought in. If the garden or entrance area is visible from the street, basic maintenance matters. A small handyman visit to clear the entrance, adjust a loose gate, secure a shed and tidy obvious rubbish can be far cheaper than dealing with vandalism later.
Lighting helps, but it needs to be sensible. Timer plugs, dusk-to-dawn external lights and motion lights can all be useful, provided the wiring is safe and fittings are weatherproof. Do not run extension leads through letterboxes or across damp floors, as that creates a fire and trip risk.
Fit Alarms, Cameras and Smart Monitoring Sensibly
Alarms and cameras can help, but they are not a substitute for physical security. A camera watching a door with a weak frame only records the problem. Fit decent locks and secure windows first, then use monitoring to give early warning.
For many vacant flats and small premises, a temporary wireless alarm or camera can be useful, especially if broadband and power are still active. If a camera records beyond your boundary, such as a pavement, communal hallway or neighbour’s entrance, you should consider data protection responsibilities and clear signage. For commercial premises, speak to your insurer as they may have specific alarm requirements.
Costs vary widely. A simple temporary camera or sensor set-up may start from around £150 to £300 plus any subscription, while a professionally installed alarm system can range from a few hundred pounds to over £1,000 depending on size, monitoring and specification. For higher-risk sites, particularly after a break-in, we would normally recommend a professional security assessment rather than buying kit at random.
Arrange Regular Inspections and Keep a Written Log
Regular inspections are one of the most overlooked parts of vacant property security. Many insurers ask for checks at set intervals, often weekly or fortnightly, and they may expect a record. A quick glance from the pavement is not enough if the policy asks for internal checks.
A proper visit should include checking all entry points, looking for leaks, smelling for damp or gas, checking ceilings for staining, confirming alarms are powered, clearing post, and noting any signs of forced entry. In winter, we also look at heating, frost protection, loft areas and exposed pipework. After heavy rain, flat roofs, parapet gutters, rear gutters and top-floor ceilings deserve attention.
Keep a simple log with date, time, person attending, photos and actions taken. This is useful for landlords, managing agents, executors and business owners. If a problem is found, the log shows you acted promptly rather than leaving the building unchecked.
Repair Damage Quickly Instead of Leaving a Weak Spot
Once a property has obvious damage, the risk increases. A cracked pane, loose board, kicked gate or damaged lock tells people nobody is keeping on top of the building. We always advise making safe first, then planning permanent repairs as soon as possible.
Common repair costs depend on access and materials. Replacing a broken pane in a simple timber window may be around £120 to £260, while specialist sash repairs or listed-building-sensitive work will cost more. A small roof repair after slipped tiles may be around £180 to £450, but access equipment, scaffolding or concealed rot can increase that figure.
Do not ignore water ingress just because the property is empty. Damp plaster, swollen floorboards and mould can turn a security issue into a refurbishment job. If you see staining, loose roof coverings, blocked gutters or damaged flashings, bring in a roofer promptly. Our roofing services team regularly deals with these London roof details, including parapet gutters and awkward rear extensions.
Know When DIY Is No Longer Sensible
There are jobs an owner can reasonably do: collecting post, trimming plants, setting timers, photographing the site and testing that doors close properly. Once you are dealing with lock replacement, damaged frames, boarding at height, gas isolation, electrical faults, leaks, roof access or evidence of forced entry, the safer route is professional help.
Do not climb onto flat roofs, lean ladders into lightwells or remove broken glass without proper equipment. Do not cap gas pipes, alter fixed wiring or bypass alarms. If the property has been entered unlawfully, treat it carefully, because there may be sharps, drug paraphernalia, unstable flooring, live electrics or disturbed asbestos-containing materials in older buildings.
For landlords and businesses, there is also a duty of care to contractors, neighbours and visitors. A cheap DIY board fixed badly can fall, trap water against timber or fail in high wind. A professional make-safe visit should leave the property secure, tidy and recorded, not just covered up.
Plan for Timing, Access and London Property Details
Vacant property security works best when planned before the keys are handed back or the occupants move out. The first 48 hours matter because that is when post starts building up, lights stop changing and any existing weakness becomes obvious. If contractors will be coming in for refurbishment, agree who locks up, who holds keys and who checks the property after deliveries.
London properties often come with access complications. You may need to coordinate with a porter, managing agent, freeholder, shop neighbour, scaffold company or alarm provider. In mansion blocks and converted houses, communal doors and rear fire escape routes must not be obstructed by boarding or stored materials.
Season makes a difference too. In winter, we think about frozen pipes, low heating settings, roof leaks and condensation. In summer, open fanlights, rear gardens, roof terraces and vacant shopfronts can be more exposed. If a building is empty during building works, secure tools and copper pipework because theft from refurbishment sites is a common headache.
As a rough guide, a basic vacant property security visit for a small flat might be a few hundred pounds if the locks are sound and only minor items are needed. A house needing several lock upgrades, window boarding, water isolation, alarm setup and roof or gutter checks can easily run into £800 to £2,000 or more. For a commercial unit, especially with shutters, glazing or multiple access points, it is best to price after a site visit rather than guess.
Frequently Asked Questions
Q1: Is boarding up always needed for vacant property security?
No. Boarding is useful for broken glass, vulnerable rear windows, empty shopfronts and high-risk sites, but sound locks, service isolation, lighting and inspections are just as important.
Q2: How often should an empty property be checked?
Check your insurance policy first, as it may state weekly or fortnightly inspections. In practice, weekly checks are sensible for most empty London properties, especially in winter or after a break-in.
Q3: Should I turn off the water in a vacant property?
Usually yes, unless the heating system or another service needs it left on. Have a plumber check the stopcock, pipework and heating arrangement if you are unsure, particularly in older conversions or houses with shared supplies.
Q4: Can I change the locks myself?
You can change some simple cylinders if you know what you are doing, but insurance requirements, poor fitting and damaged frames are common problems. If the property is vacant or has been targeted, a professional locksmith or maintenance team is the safer choice.
Q5: What should I do after a break-in at an empty property?
Photograph the damage, contact the police and insurer where appropriate, then arrange an urgent make-safe visit. Do not assume the property is safe inside until electrics, glass, doors and possible hazards have been checked.
Vacant Property Security: More Than Just Boarding Up is really about reducing easy risks before they become expensive ones: proper locks, safe utilities, sensible boarding, regular inspections and fast repairs when something changes. Kensington Maintenance Services Ltd can assess, secure and maintain empty homes, rental properties and business premises across Kensington, Chelsea and nearby London areas, so if you want the job done properly, get a quote or contact us for professional services.