Hi my uncle was a glazier self employed in the UK for years. Towards the end of his life he was supply only due to health reasons. He has sadly now passed and his wife (my aunt) has asked me to help her settle bills etc. So, we have invoices for supply only glass, but I've no idea how to calculate a markup. I obviously want the price to be covered and for my aunt to get a decent rate. Apparently the customers outstanding are not regulars so won't know the prices, but he was a very proud businessman and I wouldn't wish to over charge them (outrageously) not just settle at a nominal £20 mark up.

If anyone has any idea on how I can work it out on cost price to what I should sell it to the customer for I'd be so appreciative. There is vat to add on either.

Has anyone a hard and fast rule or any kind of formula? Is it a one size fits all formula or does it tend to be about the glazing product itself?

Best, JP