This is for a sash window that opens out onto the street.
So security is foremost.
Unfortunately it is the only means of room ventilation so it is
important that the window can be left partially open, especially in this
Can anyone suggest an affordable way of allowing the window to have an
option of being open say 4 inches, where it is impossible or very
difficult to open any further from the outside?
Search for "Sash Locks" - pretty sure I've seen some that do exactly
this - they mount part the way up the frame and can be unlocked to allow
The other option is to fit secure louvre shutters either inside or
outside to allow air through whilst the window is open.
I think shutters are a great idea - which I had them.
A variant on a piece of wood or a removable block that prevents the
opening window moving up past a certain point (eg four inches up).
A similar trick can be used on patio doors by adding a drop in wooden
baton to the inside rail track so that no amount of forcing the door
from the outside will do anything apart from exhaust the would be thief.
These are what I use and these guys appear to best value ATM:
They are effective and are available in satin or brass finish. They
require a 10mm hole behind the post and I used beefy no. 12 fixing
screws in place of the lightweight ones provided.
Other ones I have seen have various security flaws or require
inordinately large holes to be drilled in the sashes, these provide a
good balance. Their flaw is that you mustn't overtighten the post when
screwing it in as it will wear out the key/post fit and eventually
result in it spinning. You then just replace the key and post.
If you want similar security with the window closed then fit a second
set of plates below the first.
The sash stops mentioned are about the best you can do, but they do
allow the sashes to be forced apart sufficiently to clear the stops.
Screwing (rather than nailing) the staff beads may delay the casual
burglar a little, which is the most you can hope for with most domestic
I'm a great believer in the little battery operated impact alarms. Any
force sets them off and the burglar is not to know the full extent of
the alarm system.
Thanks for the ideas.
I can see a Yale/Chubb lock that should do the trick, bit for what it is
it seems incredible pricey, and there is an extra charge for keys.
(Amazon.com product link shortened)
There are others that seem to have a flip-out type of stop that are much
cheaper yet look more difficult to fit.
Difficult! Sash windows are only really secure when they're closed and
locked together in the middle. If you have something which prevents the
top sash from moving down too far (say) by having a protruding bit which
sits on the top of the bottom sash, there's not a lot to prevent someone
from pushing both sashes up and creating an equivalent space at the
bottom - which would be more of a security risk.
You really need something which independently locks the bottom sash shut
*and* limits the movement of the top sash at the same time. I suppose
that if you *never* wanted to open the bottom sash, you could screw it
shut and then fit something to restrict the motion of the top one - but
that wouldn't work if you needed it as a fire escape.
How about fitting one of those mechanisms banks have to quickly put a
barrier up between the desks and celing in a robbery,
have a sensor that detects someone putting their fingers in the gap, then
'blam' down goes the sash, the bonus is you catch the scrote as well as
protect the property,
kinda reminds me of that video of the feral youth kicking in a panel in one
of those concrete sectional fences,
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