Newpy,
I,,ll have a go for you, our work is all commercial. But without looking it is only only a 'guessedamet'.
Your description states that there are 108 x pictured window ie 8 panes. So this is worked out on the photo being 1 of 108.
108 X £4.50 = £486.00
9 X £1.50 = £13.50
24 X £1.00 = £24.00
16 X £1.50 = £24.00 TOTAL = £547.50
Thats the value of the glass cleaned , but you,ve now got to decide on area & competition etc.
I personally think £400.00 to £450.00 but without looking proper this is only a guess.
A 3 man team could do that in a day wfp easily, the client requires a quick & efficient service with the least disturbance possible.
Other things to think of are Payment Terms, CRB, Police Checks etc. Equipment used wfp or trad if low level, so risk assessment & method statements. Company h&s policy, insurance 5 million minimum. All staff must be paye, Full PPE,s etc.
If your set up for this good or offer to other company for a price, ie first clean.
Hope this helps.
Gary