Adding drains to cesspit

[cliff1010]

I have been on rated people to get a quote to complete my drains can someone give me some advice on if this is about right for the job.

after a site visit I was quoted £1800 no vat, + supply all materials.

from annexe 16.5 metres , approx. 12 of these under drive and all very shallow approx. 12 inches no more, bedded on lean mix concrete and then encased in concrete + with flexible joints. Then add inspection chamber and continue to reach old inspection chamber approx. another 10 metres

If someone can advise if this price is good or not it may be a case I do this myself to save money. I think I obviously need to work from the old inspection chamber and work back ? This is approx. 12 inches below ground in a 10 metre run what is the fall in MM I need to have this then goes into a new inspection chamber and the start of the next run back to the annexe what is the fall in MM for a 16.5 metre run. Hope someone can point me in the right direction.
cliff

[msh paving]

i do alot of drainage, that is a very good price, let em do it., as you are replacing existing you will goto the fall that's already in you cant change it. MSH

[cliff1010]

Hi no it's not existing it is a new installation joining an existing. Even though it's only about 1 foot down is it that good a price ?

[seanandruby]

Your fall is still governed by the existing. Good price.

[cliff1010]

Ok thank you both I will go with that price.