Just say you have a fixed unit rate but can discount for volume by personal discretion. Then dont match his expectations.

That way its clear he should have been upfront about the number of doors and you could have planned your time better.

He was trying a fast one with (A) and he is kidding himself with (B).

He is taking the piss SB.

He was happy with your work now he sounds like he wants to cheapen it by saying you can do the job quicker for less cost.He sounds like a dodgy builder used to dodgy builders that dont mind doing a half arsed job.I wouldnt trust him when it came to the final payment either as hes likely to be very slow to pay,full of excuses type nob.

Tell him to Fu*k off,the prick.

Sadbloke, but only in a cyberphysical way. wrote (see)

It appears to be quite common in the building trade, you do a job for a set price and then the same job repeated goes down in price.

Answer definitely ends in off!!