Are you talking per sqare and linear metre sort of thing for removal or remediation? (costings for licensed and non-licensed operations) (You could extend this to 'per cubic metre' for enclosures and waste disposal per Kg) There are other aspects of a more fixed nature such as 4-stage third-party air clearance, provision of welfare & decon unit for licensed work. Depending on the scope of works, the contractor may have to work in conjunction with and electrician for removal of older distribution boards, flashguards or backboards. Let us know if this is the kind of info. you're after.