Door & Window Maintenance: A Locksmith's Guide for Hertfordshire Homeowners

By Chris Moore, Moore Secure Locksmiths — Borehamwood, Hertfordshire

Most people don't think about their doors and windows until something goes wrong. The handle that takes two goes to catch. The door that's started catching on the frame. The window that rattles every time it's windy. These things creep up slowly — and they tend to get ignored until they become an actual problem.

The trouble is, a poorly maintained door or window isn't just an inconvenience. It's a security weakness. And often, a small job left too long becomes a much bigger one.

In this guide I'll walk you through the most common door and window maintenance issues I deal with across Borehamwood, Radlett, Barnet, Bushey and the wider Hertfordshire area — what causes them, what to look out for, and when to call someone in.

Hinge Adjustment — The Fix Most People Don't Know About

If your door is stiff to close, catches on the frame, or leaves a gap at the top or bottom, the first thing I check is the hinges.

On uPVC and composite doors, the hinges are almost always adjustable. There are three axes of adjustment — up/down, in/out, and side to side — all accessible with a hex key through small slots on the hinge face. It sounds straightforward, but knowing which way to turn and by how much takes experience. Get it wrong and you can make things worse.

Timber doors are a different story. The hinges are usually fixed, so adjustment means repositioning them — which involves removing the door, chiselling out the recess and refitting. It's more involved, but still very much a repair rather than a replacement job in most cases.

Signs your hinges need adjusting:

- The door rubs or catches on the frame when closing

- You have to lift the door slightly to get it to latch

- There's an uneven gap around the door — wide at the top, narrow at the bottom, or vice versa

- The door swings open or closed on its own

Left untreated, a misaligned door puts enormous strain on the lock. The multi-point mechanism is designed to engage cleanly — if the door has dropped even a few millimetres, the hooks and bolts can't seat properly, and eventually the lock fails. A hinge adjustment costs a fraction of a new lock.

Friction Stay Replacement — Windows That Won't Stay Open (or Won't Close Properly)

A friction stay is the metal arm that controls how far a casement window opens and holds it in position. Over time — usually after years of use, UV exposure, and the occasional strong wind catching the window — they wear out, bend, or seize.

When a friction stay fails, you'll usually notice one of the following:

- The window won't stay open — it keeps swinging shut

- The window drops when open and won't hold at a set angle

- The window is stiff or difficult to open in the first place

- The window sits proud of the frame when closed, letting in draughts or rain

Replacing a friction stay is a straightforward job if you know what you're doing — but getting the right size and type matters. Stays come in different lengths, load ratings and fixing patterns, and fitting the wrong one will leave you with the same problem. I carry a range of common sizes and can usually replace one on the same visit.

This is one of those jobs that's easy to put off but really worth sorting quickly. A window that won't close properly or seal correctly is a security risk as well as a draught problem.

Door Shaving — When the Door Just Won't Close

Timber doors are vulnerable to seasonal movement. In summer, the wood absorbs moisture and expands. In winter, it contracts. If your timber door closes perfectly in February but sticks badly in August, that's almost certainly what's happening.

Door shaving — taking a planer to the sticking edge of the door to remove material — is the traditional fix. It works, but it needs to be done carefully:

- Shave too little and the problem returns next summer

- Shave too much and you'll have a draughty gap in winter

- Shave the wrong edge and you affect the lock or hinge alignment

The correct approach is to identify exactly where the door is binding — usually the top or leading edge — remove the door from its hinges, shave back only what's needed, and seal the freshly planed edge to slow down future moisture absorption.

It's also worth checking whether the issue is actually timber movement at all, or whether the door has simply dropped on its hinges. The symptoms can look similar, but the fix is completely different. Shaving a door that's dropped won't solve the problem — you'll just have a door that's too small for the frame by winter.

uPVC, Timber & Composite — How Maintenance Differs by Door Type

Not all doors need the same care. Here's a quick overview of what to look out for depending on what you have.

uPVC Doors

uPVC is low maintenance but not no maintenance. The main things to keep on top of are:

- Lubricating the lock mechanism every 6 months with a dry PTFE spray (not WD-40)

- Cleaning the rubber seals around the door frame — they can harden and crack over time, affecting both draught-proofing and security

- Checking the hinges for adjustment annually, especially on heavier doors

- Keeping the locking strip track clear of debris — grit in the door edge can wear the mechanism surprisingly quickly

Timber Doors

Timber needs more attention, particularly on exposed elevations:

- Repainting or re-varnishing the door every few years seals the wood and dramatically slows seasonal movement

- Check the bottom edge of the door — it's the most exposed and often the first to absorb moisture if the seal has broken down

- Oil or grease traditional hinges annually

- Check that the frame itself isn't moving — older timber frames can shift independently of the door, causing alignment issues that no amount of hinge adjustment will fix

Composite Doors

Composite doors are generally the most stable — they don't warp or swell the way timber does, and they're tougher than uPVC. But they're not maintenance-free:

- The locking mechanism still needs regular lubrication

- The hinges are adjustable and should be checked if the door starts to drop — composite doors are heavier than they look and hinge wear is common

- The rubber seals around the frame need the same attention as uPVC

Window Restrictors — A Small Fitting That Matters More Than People Think

A window restrictor is a simple device that limits how far a window can open. They're most commonly fitted in upstairs rooms — particularly children's bedrooms — to prevent falls, but they also serve a security function on ground floor and accessible windows.

There are two main types:

Key-operated restrictors

lock the window to a fixed position, typically 100mm of opening. They can only be overridden with a key, which makes them effective for both child safety and security. These are the type I'd always recommend for ground floor windows or any window accessible from a flat roof or extension.

Push-button or cord restrictors

Allow adults to release the window easily in an emergency but prevent children from opening it fully. These are better suited to upper floor bedrooms where security isn't the primary concern.

If you're a landlord, it's worth knowing that window restrictors on upper floor windows are a legal requirement in many rental properties. If you're not sure whether your properties are compliant, give me a call — it's a quick and inexpensive job to sort out.

Restrictors wear out, get damaged, or are sometimes removed by tenants and not replaced. A window without a functioning restrictor on an upper floor is both a safety and liability issue.

A Few Other Things Worth Knowing

Letterboxes — A loose or broken letterbox is more than cosmetic. Letterbox attacks — where a hook or rod is pushed through to catch door keys hanging nearby — are a real and common burglary method. A letterbox restrictor plate fitted on the inside takes minutes to fit and makes this type of attack virtually impossible.

Door handles — Handles that feel loose or spongy aren't just annoying. On a multi-point door, the handle drives the gearbox that operates the lock. A worn handle spindle can prevent the lock from engaging fully, even if the mechanism itself is fine.

Window handles — Cockspur and espagnolette handles both wear over time. If your window handle turns but the window doesn't feel secure, the handle may have stripped internally or the lock cam may have worn. Worth getting checked rather than ignoring.

When to Call a Professional

Most of the issues above can be identified with a quick visual check. But if you're not comfortable working on doors or windows yourself — or you've tried an adjustment and things still aren't right — it's always worth getting someone in.

I'd rather come out and tell you it's a five-minute hinge tweak than have you discover a failed lock or a stuck door at the worst possible moment. And if something does need a proper repair or replacement, I'll always tell you what's needed and give you a clear price before I start any work.

I cover Borehamwood, Radlett, Barnet, Bushey, Stanmore, Potters Bar, Edgware, Mill Hill, St Albans, Shenley and the wider Hertfordshire and North London area — and I'm available 24/7 for emergencies.

Call or WhatsApp Chris: 07939 022528

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*Moore Secure Locksmiths is MLA qualified and DBS checked. No call-out fee.*