Defined scope first, then current local labour and material rates for the trades involved, with the assumptions stated on the face of the estimate. Because the scope is written the way a contractor would bid it, each line can be examined independently rather than accepted as a whole.

Not usually. A sound correction often has to extend to a control joint, a doorway or a natural break in the material, because stopping mid-field produces a new transition and a new hazard. Where the extent exceeds the defective area, the reason is stated explicitly.

Yes. Where correcting a condition necessarily produces an improvement over what was there, such as a new finish across a larger area or an upgrade because the original product is discontinued, that element is identified separately so counsel can address it distinctly.

A preliminary scope can be developed from photographs, drawings, specifications and the existing record, and is useful for early case assessment. A figure intended to be defended is far stronger after an inspection, because substrate condition is rarely visible in photographs.

Because access, protection, phasing and out-of-hours working are real costs. The same area replaced overnight in sections with temporary protection between them carries a materially different figure from the same work in an empty unit, and those assumptions are stated rather than buried.

As a scope narrative with the assumptions visible, so each element can be examined and challenged on its own terms. No fee information for expert services appears anywhere on this site; cost of repair is a case deliverable prepared for the matter at hand.