Pricing help please

Sorry to ask anyone on here I'm just looking to see if I'm on the right tracks with regarding prices?.

I live in the Bedfordshire area.

I charge 50p for a small window

£1 for medium

£1.50 for large

£2.50 for bay windows and patio doors.

Am I pricing too low? 

How much would you charge for this??

I charge 50p per standard size opening window, so £1.50.

And just use that as a benchmark etc.

A double patio door is roughly the size of 4 standard size opening windows so £2

Some like to work on time to clean and access etc.

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I would probably charge around £1.50 aswell. I just didn't know if I was at the right price or if I was undercutting myself. Thank you for your help