Independent comparisons. We may earn from shop links. More info

Best window lock for the job

Updated: 16 October 2026

Search results for the best window lock often crown a trade restrictor that is not in this set, or they treat a cable as if it locked the house. You are choosing among nine amazon.co.uk listings captured on 15 October 2026. The question is which packet matches the frame, and which to leave. Scores are on the [window lock comparison](/hub/burglar-protection/window-lock). If you buy through our links, we may earn a commission at no extra cost to you. The page is from the Products Compared editorial team. Nothing was tested in a lab.

Search results for the best window lock often crown a trade restrictor that is not in this set, or they treat a cable as if it locked the house.

Our top picks

Schlosser Technik Schlosser Technik cable restrictor, 2 pack

Best overall

Schlosser Technik Schlosser Technik cable restrictor, 2 pack
8.6/10about £13.40
View offer
XFORT XFORT Viper cable restrictor, 4 pack

Preis-Tipp

XFORT XFORT Viper cable restrictor, 4 pack
8.3/10about £18.99
View offer
Yale Yale 8K101 window latch, 4 pack

Alternative

Yale Yale 8K101 window latch, 4 pack
8.4/10about £20.98
View offer
On this page
  1. 1.Screw-fixed keyed cables
  2. 2.Adhesive packs and the shared reviews
  3. 3.The timber latch
  4. 4.The hook to leave

Screw-fixed keyed cables

A screw-fixed keyed cable is the usual second device on a uPVC casement that already locks on the handle. Three listings are sold that way. Schlosser Technik is about £13.40 for two, rated 4.6 from 4,116 reviews, the longest independent file here. The title says uPVC. One stored review describes a high fit, the cable at about 100 mm, after a 2.5 mm pilot. That gap is one person's measurement. The page prints no cable length, and tested to British Standards names nothing. Stored reviews say there were no instructions and one key per lock. XFORT's Viper four-pack is about £18.99, rated 4.4 from 789 reviews, with a claim of hardened steel cable above 1,000 N and no standard number beside it. Four locks at that price, against two at £13.40, is the best value among screw-only restrictors with their own reviews. Several stored reviews found the supplied screws too long for uPVC and used 4 x 25 mm. Cable length is not printed. eSynic is about £16.95, rated 4.5 from 738 reviews, with a 19 cm wire. The title says six restrictors. One bullet says eight, and the unit-count field says 10 Pack. One stored review says screws bite less in uPVC than in wood. Fitting is on how to fit a window restrictor.

Adhesive packs and the shared reviews

Cheaper multipacks offer adhesive or screws, and several also name a fridge or a cupboard. Stored reviews say adhesive alone was pulled off and screws held. Use screws where a fall would injure someone. The £5.99 two-pack, the £11.99 four-pack and the MIVITOOM eight-pack at £19.94 all show 4.5 from 1,587, with the same first 50 stored texts. One pool. The two-pack prints a 188 mm cable and 3 mm wire, and a stored review says a strong child pulled an adhesive fit off. The £5.99 pack is the smallest outlay on that shared file, not a separate best-value award. A different four-pack at £11.99, face 7.5 × 3.2 cm, has no star line and was first listed on 18 August 2026. Fall rules are on window restrictor child safety. Job and frame come first in the window lock buying guide.
Schlosser Technik Schlosser Technik cable restrictor, 2 pack

Testsieger

Schlosser Technik Schlosser Technik cable restrictor, 2 pack
8.6/10about £13.40
View offer

The timber latch

The Yale 8K101 is about £20.98 for four, rated 4.4 from 335 reviews. It is a steel surface latch for hinged timber casements, with a clenching action the listing says can pull the sash in and ease a draught. There is no cable. The box is four locks and a key, and one stored review ordered extras. Buy it when the timber sash must be shut. Skip it on uPVC, and skip it if you wanted the window ajar.

The hook to leave

The chrome hook is about £6.59 for four, rated 5.0 from one review, with no key and no cable length. The listing says it is not for double-glazed UK windows. Leave it. It is not a third choice beside the cable and the Yale latch. More money in this set still does not buy a PAS 24 window.

Common questions

Which listing is the best window lock in this set?
None suits every frame. The top pick is the Schlosser two-pack, on 4.6 from 4,116 reviews and a screw fit, with an unnamed British Standards line. Best value among screw-only restrictors with their own reviews is XFORT at £18.99 for four. A timber sash that must shut is the Yale 8K101.
Who should buy the Schlosser Technik two-pack?
Buy it for uPVC when you want a screw-fixed cable and the longest independent review file here, at £13.40. One stored fit used a 2.5 mm pilot and about 100 mm of stretch. Skip it if you need a named standard, a printed cable length, or a spare key.
Is the cheapest two-pack the best value?
£5.99 is the smallest outlay, not the best value award. Its 4.5 from 1,587 is the same file as the £11.99 four-pack and the £19.94 eight-pack, and stored reviews say pads pulled off while screws held. XFORT takes best value because it is screw-only, with 789 reviews of its own. Use the £5.99 pack if you will screw two locks and accept a shared file.
Is the Yale 8K101 a restrictor?
No. A key locks it around a staple and the listing says it pulls a hinged timber casement shut. It sets no ventilation gap. The capture is £20.98 for four, rated 4.4 from 335 reviews. Use it on timber you want closed. Do not fit it to uPVC because a search result said window lock.
Why do three listings share the same review count?
The £5.99, £11.99 and £19.94 packs show the same 4.5 from 1,587 and the same first 50 stored texts. One pool. Buying eight does not mean 1,587 people reviewed that eight-pack. The other £11.99 four-pack has no star line and is a different listing.
Does a higher price mean a PAS 24 window?
No. More money here buys a brand or a longer review file. PAS 24 tests a complete window. None of these cables prints it. Schlosser's standards line has no number, and XFORT's 1,000 N claim has no standard identifier beside it.

Related pages

Cable restrictor vs window latch

Window locks

Window lock buying guide: job, frame, fixing and key

Window restrictor child safety: gap, key and rules

How to fit a window restrictor on uPVC or on timber

Sources

Public UK sources and the amazon.co.uk listings in this comparison. Listings captured 15 October 2026. Page updated 16 October 2026.

  1. Approved Document K (2013) (retrieved 15 October 2026)
  2. Approved Document Q (retrieved 15 October 2026)
  3. HSE: falls from windows (retrieved 15 October 2026)
  4. CWCT: are window restrictors designed to resist adequate loads (retrieved 15 October 2026)
  5. BSI: PAS 24:2022+A1:2024 (retrieved 15 October 2026)
  6. AXA Connect LC01 locks requirement (retrieved 15 October 2026)
  7. MLA minimum security requirements, January 2025 (retrieved 15 October 2026)
  8. RoSPA: falls (retrieved 15 October 2026)