Letterbox Repair Guide

A letterbox repair in the UK typically costs £60–£180 for the most common faults — sagging flaps, broken springs, draughty brushes, or a sticking inner cover. A full replacement letterbox runs £40–£120 for the part plus £60–£140 labour for fitting, depending on whether the door is timber, composite, or uPVC.

Letterboxes wear out faster than the door itself — the spring fatigues, the brush fills with dust and debris, and the flap rattles in the wind. A 5-minute inspection now saves a £180 callout if you catch wear early.

Common letterbox problems

• Flap won't stay closed — broken or weakened spring. Either replace the spring (£10–£25) or the whole letterbox.
• Draughty letterbox — worn or missing brush insert. Brush kits cost £8–£20 retail and slot into most modern letterboxes.
• Squeaks or rattles — loose mounting screws, or worn pivot bearings. Tighten the inner cover screws first; replace if pivot is damaged.
• Inner cover sticking — typically a design issue or distortion from heat. Often resolved by adjusting the catch or replacing the inner flap.
• Letterbox sagging out of door — screws have pulled out of timber, particularly common on older softwood doors. Repair with longer screws or wood-filler reinforcement.
• Letterbox security concerns — anti-fish bars or hood inserts to prevent letterbox key-fishing attacks. £15–£40 for the insert.

Typical UK costs

Door type matters

Each door material has its own letterbox approach:

• Timber doors — easiest. Standard letterboxes are sized for timber doors; cuts can be enlarged with a router if the new letterbox is bigger. Most common faults: screws stripping in softwood (use longer screws or T-nuts).
• uPVC doors — pre-formed letterbox cut-outs, replacement is straightforward but the new letterbox must match the cut-out size exactly. Manufacturer-specific spares may be needed.
• Composite doors — like uPVC but with extra reinforcement around the cut-out. Cuts can't be enlarged; replacement letterboxes must fit the existing aperture.
• Glazed or partial-glazed doors — letterboxes are typically in the lower half; if cracked, can sometimes be replaced without disturbing the glazing.

Security — TS008 and what it means

If you're replacing a front-door letterbox, consider a TS008-rated unit. TS008 is the British Standard for "letterbox aperture protection" — designed to prevent key-fishing, hand-reaching, and arson attacks. Many home insurance policies discount premiums for compliant front doors. £100–£250 supplied and fitted.

For period homes where TS008 looks too modern, anti-fish bars or restrictor plates fitted behind the existing letterbox are a discreet alternative — £40–£90 installed.

Things people often miss

• Brush kit refresh — most "draughty front door" callouts are just a worn brush. Buy a £15 kit, slide out the old, slide in the new — 5 minutes.
• Spring direction — letterbox springs are handed (left or right). When ordering replacements, photograph the existing one or measure the spring's wind direction.
• Anti-pick mailguard — internal cage that prevents post being grabbed back through the slot. Cheap (£20) and useful in semi-detached or terrace properties where letter theft happens.
• Period property considerations — Victorian, Edwardian or listed-building front doors often have non-standard letterboxes. Conservation officer may insist on like-for-like replacement; specialist suppliers like Willow & Stone or Croft Architectural carry period-correct designs.
• Letter-cage leaks — internal letter cages (boxes that catch incoming post) can rattle in wind, scratch the door, or trap parcels. Position carefully or use a soft-close model.

Frequently asked questions

Can I replace a letterbox myself?

For timber doors with standard letterbox cut-outs, yes — straightforward DIY job, £30–£60 in parts, half an hour with a screwdriver. For composite or uPVC doors, the manufacturer-specific replacement is recommended; a carpenter or door-fitter avoids cut-out damage.

How do I stop my letterbox letting in a draught?

Replace the brush insert first (£10–£20). If brushes are missing entirely, fit a draught-excluder kit (£20–£40) which adds an inner flap with a foam seal. For severe drafts, the whole letterbox may need replacing with a modern unit that has integrated brushes.

What is TS008 and do I need it?

TS008 is the British Standard for letterbox security — anti-fish, anti-arson, anti-grab. Required by some insurance policies (check yours), and increasingly expected on new front doors. If your front door letterbox is more than 10 years old, upgrading to TS008 is worth considering.

Why is my letterbox flap drooping?

Either the spring has weakened, or the pivot bearing is worn. Springs cost £10–£25 to replace and slot in with a screwdriver. If the entire flap rattles or wobbles, the whole letterbox usually needs replacing — pivots wear faster than springs.

Can a carpenter widen the letterbox slot for parcels?

For timber doors — yes, with a router and new letterbox sized to the wider aperture. For composite or uPVC — usually no, the door's reinforcement won't allow it. Better solution for parcels: a wall-mounted parcel box outside.

Should the letterbox have a hood or sleeve?

Hooded letterboxes prevent rain ingress and add a small security benefit. Sleeve letterboxes (chuted into a basket inside) prevent grab attacks. Both are good; pick based on your priority. Don't fit a hood that obstructs the postman's typical handful of A4 mail.

Want a local pro to handle this? A carpenter or door-fitter will diagnose the issue, source the right replacement (especially important for composite/uPVC), and fit cleanly without damaging the door. Quick job, modest cost.