External ST Gobain render coloured brick effect price?

[Faune]

I was given a price for external render (new) for attached garage walls approx. 15 square metres . The firm was using St Gobain render two types one for a plain coat then another coloured for top coat. they then cut out top coat to create a brick pattern and finally daubed random colours on each brick to blend in with my house. The whole job took 2 and a half days and the effect was good but they charged me £3408 including VAT.
I am lady of 70 and unable to climb ladders to check quality of work . Does this price seem excessive?
Can anyone advise? Thanks