Window locksmith - When you might need one
July 29, 2025
Upgrading window locks? Installing new window locks? Do you need extra security on your windows? We'll answer these questions & more....
Window locksmiths in London
Window security and window locks can be just as important as having a good front door lock. This is especially the case in situations where the property has windows on the ground floor. It's just as easy to break into a window if it's not utilizing the correct lock or even if it does have the correct lock however it hasn't been installed correctly.
Different windows require different lock so the first thing we do is look at what your windows are made of. Windows, like doors can be made of different composite materials ranging from UPVC Windows to Aluminium Windows. We will cover the material of the window and then the way in which it opens and options for locks .
Wooden windows - Sash window locks
These often open by lifting the bottom window towards the top window. Wooden sash windows are very common in victorian houses and all over London. they can both be very effective in keeping out intruders, but can also be an extremely weak spot in a properties security. Sash windows should always be secured with bolts that screw into the opposite window. This means that neither the bottom window can be moved up, and the top window cannot be forced down either.
Sadly, most Sash windows in London are not secured with bolts on either side unless they have been visited by a window locksmith . They are usually secured with only a small lock that sits on the top of the bottom window. This will normally slide or screw into a part that installed on the bottom of the top window. These are called "Sash jammers" as well, however they are manufactured from metal and not UPVC. The point of connection is very weak and these are very easily removed from outside the property. These locks are also not insurance compliant and for good reason. As they don't require a key to lock, they can be opened in other ways due to them being right above the gap in the window. We advise upgrading these to bolts on either side of the windows as soon as possible. A Window locksmith in London will normally provide advice on upgrading window locks and which locks will work on which window. If not , just contact us here and we will be happy to help.
UPVC Windows - Sash
Since the introduction of plastic/ UPVC it has been used to update many products that were originally made of wood. This includes Sash windows, however they will most likely cost twice the price of wooden windows. These will protect you from the weather in the best way, and can be offered in double glazing options. Normally when installing UPVC windows its best to check that the correct side bolts are installed as in the above wooden sash windows. Sometimes builders will take the shortcut and only install that little lock between the two windows, even with less of a gap due to them being manufactured from UPVC, they will still be easy to open from the outside of the property with just a flat head screwdriver of the right size. Check out our contact a locksmith pagefor more advice.
UPVC Windows - locks
Normally when a window is manufactured from UPVC (Plastic, often white) It will have three main components. The window itself, locking mechanism that sits inside the window along the frame, and the locking handle. For most UPVC windows it is only possible to open the window from the inside via a key inserted into a handle. These are usually very secure as the only way to open the window is from inside the property - provided the handle is turned with the window fully closed. To ensure full security turn the key to lock the handle as well.
If you are still looking for ways to upgrade security on your UPVC windows you can call a UPVC window locksmith to install "UPVC - Sash Jammers". These hang over the edge of the window/ frame and ensure that if not turned away, from inside the property, will not allow the window to open. It's even possible to get lockable sash jammers , these ensure that not only do you have to be on the inside of the property but also need a key.
Wooden/ Metal windows - Casement
Despite being very common in the UK and London before Sash windows were introduced, these windows can be vulnerable to a number of attacks, as such they need to be secured correctly, we'll go into this once we cover what casement windows even are as they aren't that common anymore. A casement window is a window that is attached to its frame by one or more hinges at the side. They are used singly or in pairs within a common frame, in which case they are hinged on the outside. Casement windows are often held open using a casement stay, they are also locked with this casement stay. The casement stay is normally a length of metal bar at the bottom of the window with multiple holes along the length of it, these holes are used with a pin to hold the window open or closed.
As it's fairly easy to use a slim metal clothes hanger and simply move this stay, we advised installing locking casement stays or bolts that go into the frame and stop the window from opening without a key.
Once secured properly by a window locksmith , these windows do offer more protection from the weather and drafts as the windows close into each other as opposed to sliding against each other.
We hope we have done enough to cover all window types in London, if you happen to see or know of other window types or window locks, why not contact us? Oh and if you can't open a locked window, or can't close an open window (it happens with UPVC Tilt & Turn windows when the UPVC handle fails or the mechanism fails) contact us if you need a Local Window Locksmith .
If you live in Wimbledon’s SW19, you know the vibe - gorgeous tree-lined streets, the buzz of the Wimbledon Tennis Championships, and the charm of the Village or Common just a short walk away. But between the stunning Victorian houses, sleek modern flats, and lively shops on the high street, there’s a catch: lockouts after a late night cheering at the All England Club or the odd break-in, in quieter spots can throw a wrench in your day. Even thing like moving homes or updating your home insurance can come with challenges. That’s when you need a local locksmith you can count on to sort things out fast. At SMS Locksmiths, we're proud to serve Wimbledon and the SW19 area (including Southfields, Merton Park, and Colliers Wood) with 24/7 emergency and planned services. Our DBS-checked, fully insured technicians arrive within 30 minutes, using non-destructive methods and transparent pricing - no hidden fees or call-out charges. Whether you're a homeowner securing your Edwardian semi-detached or a business owner in the Wimbledon Broadway retail hub, we're here to keep you safe. In this guide, we'll cover the top 5 locksmith services we provide to SW19 residents, tailored to local needs like upgrading heritage locks or handling post-match rush lockouts. Read on for practical tips, and remember: prevention is key to peace of mind. 1. Emergency Lock Opening: Back Inside in Minutes, No Damage to basic locks Nothing disrupts a Wimbledon evening stroll like realising you're locked out - keys forgotten after a coffee at Gail's or a tennis viewing party. Our lock opening service gets you back in fast using advanced pick-and-decode tools, bypassing tools and years of skill and experience, avoiding costly door damage. • Why Wimbledon residents love it: SW19's mix of old sash windows and modern uPVC doors means quick, non-destructive entry is essential. We handle everything from front doors to sheds and post boxes without a trace. • Real-life example: A local family in Southfields called us at 10 PM after misplacing keys during a dog walk on the Common. We arrived in 25 minutes, opened the lock in under 10, and advised on a spare key safe. • Pro tip: Always keep a copy of your keys with a family member or a person you trust, but call us immediately for lockouts - DIY attempts often lead to bigger bills. No matter the time, our 24/7 team ensures you're not stranded. Customer review: "SMS saved our night - professional and stress-free!" – Wimbledon Village resident (5 stars on Trustpilot). 2. Lock Changing: Fresh Security for New Starts in SW19 Moving into a charming Wimbledon flat or after losing keys? A lock change is your first line of defence against unknown access. We replace old locks with high-quality, British Standard (BS3621) compliant options that meet insurance requirements. • Tailored for Wimbledon: Many SW19 homes have outdated rim locks on period properties; we swap them for secure euro cylinders or deadbolts that fit seamlessly. • The process: On-site assessment (free quote), removal of old locks, installation (under 45 minutes), and a full test. Costs start from £110, with a 1-year warranty. • Local insight: With rising lettings in Merton Park, tenants often request changes post-move—we've helped dozens secure their new homes and flats without voiding deposits. Don't risk spare keys circulating; a quick change brings instant security. Book via our site for same-day service. 3. Lock Upgrades: Boost Protection Against Wimbledon Burglary Trends SW19 saw a spike in bike thefts and shed break-ins last year, per Merton Council reports. Our lock upgrades modernise your setup with anti-snap, anti-drill cylinders and multi-point systems, deterring thieves in high-traffic areas like Haydons Road. • SW19-specific benefits: Upgrade Victorian night latches to snap-resistant models or add 5 lever British standard deadlocks for Colliers Wood flats – we supply multiple brands for you to choose from on site. • Why upgrade now?: Standard locks fail 70% of tested break-ins; our BS-approved options slash that risk and keep premiums low. • Quick win: A Wimbledon Broadway shop owner upgraded their rear door after a near-miss; no incidents since, and they saved on insurance. We offer free security audits to spot weak points - perfect for families near the tennis grounds during tournament season. 4. New Lock Installations: Seamless Fits for Home or Business Renovating your Wimbledon townhouse or fitting out a new office near Plough Lane? Our lock installation service handles everything from single deadbolts to full master key systems for multi-unit properties. • Local expertise: We specialise in SW19's diverse builds -reinforced locks for ground-floor flats or heavy-duty ones for garage conversions in quiet Merton Park cul-de-sacs. • Step-by-step: Site visit for measurements, custom sourcing (e.g., thumb-turn cylinders for easy exit), professional fitting, and handover with keys and instructions. Most jobs completed in the first visit. • Business perk: For Wimbledon shops and cafes, we install mechanical digital access control for staff shifts, reducing downtime. Invest in lasting quality - our installations come with lifetime advice and no-fuss guarantees. 5. After-Burglary Services: Restore and Reinforce in SW19 A break-in is every homeowner's nightmare, and Wimbledon's green spaces can attract opportunists. Our after-burglary response includes immediate boarding-up, full lock replacements, and forensic-safe repairs to get you secure overnight. • Comprehensive support: We coordinate with police (providing reference numbers for claims), replace damaged frames, board up broken doors and windows to restore security providing you with peace of mind and giving you time to change doors. • Wimbledon focus: In areas like Southfields, where gardens back onto commons, we add perimeter advice like gravel paths for noise alerts. • From the frontlines: After a recent Merton burglary wave, we helped a family in SW19 board up, reinstall high-security locks, and claim via photos - back to normal in 24 hours. Act fast: Delaying repairs invites further risk. We're your second call after the police post-incident, with compassionate, efficient service. Why Choose SMS Locksmiths for Your Wimbledon SW19 Needs? As a family-run business with over a decade in South West London, we know SW19 inside out - from the rush of match days to the serenity of the Common. Our services aren't just fixes; they're tailored solutions with free quotes, 30-minute responses, and eco-friendly practices (we recycle old locks!). Plus, we're fully insured and DBS-vetted for your peace of mind. Ready to secure your Wimbledon home or business? Visit smslocksmith.co.uk to book online or request a free security check. For emergencies, we're just a click away - no postcode too far in SW19! Stay safe, Wimbledon - SMS Locksmiths has your back. #WimbledonLocksmith #SW19Security #EmergencyLocksmith #LockChangeWimbledon #MertonLocksmith ________________________________________ FAQs for SW19 Residents: Q: How quickly can you arrive in Wimbledon? A: Typically 20-30 minutes, 24/7 - no exceptions for rush hour on the A3! Q: Are your services insured for SW19 properties? A: Yes, all work is given a 1 year warranty and compliant with UK standards. Q: What's the cost for a basic lock change in Wimbledon? A: From £110, with no surprises - get a quote today. For more security tips, check our blog or follow us on social for Wimbledon updates!
Below is a more detailed breakdown of each service, which you can place under “Locksmith services we provide in Hounslow”: Lock Changes & Upgrades
 If you’ve just moved into a new home or want to increase your security, we can replace your locks with better, more secure models. Whether it’s euro cylinders, mortice locks, deadbolts or master key systems, we can recommend and install insurance-grade products. Lock Repair & Adjustment Locks wear out over time - maybe the key sticks or you force it to turn. We diagnose whether parts can be repaired (springs, levers, cylinders) or whether it requires replacement. We can also realign misaligned mechanisms so things work smoothly again. Emergency Lockout / Non-Destructive Entry Locked out at an inconvenient hour? We specialize in non-destructive entry, meaning we’ll open your door without breaking it. We carry a full set of specialised tools, from lock picks to tensioners, to gain entry safely and professionally. Burglary & Forced Entry Repair If your property has been broken into, we can repair or replace damaged locks, door frames, or hinges. We can also strengthen weak points and offer recommendations to prevent future incidents (e.g. reinforced strike plates, heavy-duty cylinders). Door & Frame Carpentry / Refurbishment Sometimes the door frame, jamb or door edge is also damaged or poorly aligned. We can carry out carpentry, reinforce the frame, repair door edges, or adjust the door fitting so your locks work properly. UPVC / Multi-Point Door & Window Mechanisms UPVC doors and windows often have multipoint locking systems that require delicate handling. We service, repair, or replace gearboxes, locking rods, handles, and cylinders. We can also realign or replace stuck mechanisms so your windows and doors seal properly. Commercial & Business Services For offices, shops, and commercial premises, we offer: Master key systems Restricted key zones Keyholding & emergency access Panic bars, exit devices, and high-security door furniture Mechanical Digital keypad / access control installations Lock re-keying when staff changeover occurs Area Coverage & Availability We cover the TW3 area and nearby zones in Hounslow, including Feltham, Heston, Cranford, and West Drayton. Wherever you are in Hounslow, we strive to reach you fast. We operate 24/7, every day. Even during weekends and bank holidays, we remain on call.
