Where can I buy 12mm square lengths of timber?

[JT101]

I need to put a 12mm deep trim around my window frame so I can add magnetic strips to it, and then a sheet of perspex for secondary glazing.

Ideally, I need 12mm x 15mm x 6m, but 12mm square will suffice since it's more likely a standard size. Obviously it will come in shorter lengths than that.

Just can't seem to find anywhere that sells it. I've searched for "12mm square wood mouldings / trim".

What would I search for?

Thanks in advance

 

[Burnerman]

Most of the big sheds have racks with timber mouldings and trims of different sections - usually 2m lengths.
John

 

[merlin50]

if its 12mm x 15mm its not square is it

 

[joe-90]

Get a circular saw with a small toothed blade and some 6x2 timber and you can cut whatever size you need. Saves a fortune on pre-cut stuff. I do it all the time.

 

[cajar]

I've thought of doing that joe but how many blades do you go through - doesn't that cost more than buying pre-cut?

 

[Diyisfun]

Go to a timber merchant they will cut it as you want it, they charge only for the timber that its cut from, b&q will also do that. f.o.c

 

[joe-90]

A blade will last the average amateur for years. You'll find it useful for all sorts of things. Just watch your fingers.

 

[JT101]

Did a little more research and found it's commonly known as "stripwood" or "square dowels". Managed to get it from local timber merchant which was better to support them than big DIY. And it was cheaper. THanks for your help

And in answer to Merlin, if you read my question you'll see I stated "12mm square will suffice since it's more likely a standard size". I wanted 12mm x 15mm, but I thought 12mm square would be more readily available and so was willing to compromise.