Are door sills universal?

[anything electrical]

Hi
I am changing an old conservatory roof and windows.
The problem I have is that the sill for the french door and the 4 full lenth windows come in 8ft lenths.
Can I get a 12ft universal type of sill to go all the way across the 12ft front view ( door and full lenth windows ) so there are no joints or are they all different.
Also I would prefer the narrower sill.
I am hoping to get 4 of 600mm x 2090 side panels from wicks and use my existing 1 year old 4ft french door.
all in upvc.
Also where can I get 12ft of door sill from ( I am in bedfordshire. )

Ta

Paul

 

[Hows-it-hanging]

Is it UPVC? Your local window manufacturer will have a sill that will be long enough. If not they can join two lengths with out you seeing the join.

 

[Nikonan]

Make sure you get a cill that fits the doors you have, some don’t cover the lip on the base of the frame, this can interfere with drainage.