No fensa certificate for windows/ conservatory.

[Toddlerteaplease]

My parents are looking to sell their house but the conservatory that is 30 years old, and some other windows don't have certificates as they weren't issued then. Do they need to do anything?

I bought mu house from probate and had no paperwork for anything. I knew I was getting a doer upper and it didn't bother me. I would imagined if the place is immaculately it would attract a different sort of buyer who might care.

Yes it is immaculate.

I just bought a house and remember reading somewhere that Fensa is only for windows installed after April 2002. They'll be fine.

You definitely don't need fensa for conservatories and only windows installed after 2002. If you don't have them or can't get hold of them and the buyer desperately wants them they will probably just offer to supply an indemnity policy to cover it (at a cost to you, but they aren't that expensive usually).
I'm in the process of selling/buying so have come across this recently.

We didn't have certificates and would have taken too long to chase up the company, indemnity policy our solicitor set up was less than £50 if I recall correctly (5 years ago)

You can get a copy of your FENSA certificate here: forms.fensa.org.uk/fensa-certificate