Interior & Exterior Works · Question

How do I compare two interior quotations that list items differently?

Short answer

Build one master sheet of every work area and item, then map each contractor's lines onto it, noting material, finish, quantity and what the rate includes. Where a quote is silent, mark the gap and ask in writing. Only after both are priced against the same scope can the totals be compared meaningfully.

In more detail

Quotes rarely line up. One contractor writes by room, another by trade, and a third gives a lump sum with a short description. Comparing totals in that state rewards the contractor who left things out.

Start from your own requirement: drawings, finish schedule and a wish list. List each item you expect, such as partitions, ceilings, flooring, carpentry, lighting, paint and cleaning. Then copy each quotation into that structure.

For every row, record four things: the material and grade, the quantity, the unit rate or lump amount, and whether anything is excluded. Quantities are a frequent source of difference, because one contractor may measure generously and another tightly.

Same total, different content

Two quotes for a small office came out close in price. Mapping them showed one included concealed wiring, glass partitions and a ceiling grid, while the other priced only the ceiling board and listed the rest as client scope. After adding the missing items, the second offer was clearly the costlier one.

Next, flag soft items: provisional sums, "as per site", brand-free descriptions such as "branded laminate", and anything described as equivalent. These can move the price after you have signed.

Finally compare the commercial terms: payment stages, validity, schedule, defect period, and who bears wastage and transport. A lower price with heavy advance payments or vague timelines may not be the better offer.

Send a clarification list to both contractors and ask for revised quotes on the same basis.

Key points

Create your own master list of items, then map each quotation onto it.
Compare material, quantity, rate and exclusions row by row, not totals alone.
Mark provisional sums, vague brand wording and silent items for written clarification.
Compare payment stages, schedule and defect period, not only price.
Ask both bidders to resubmit on an identical basis where possible.

Who this applies to

Owners holding two or three quotations that read very differently.
Tenants and shop owners selecting a fit-out contractor under a tight budget.
Accounts or purchase staff asked to justify a contractor selection on paper.

Last reviewed 3 October 2026

This answer is general information, not advice on your particular case. Terms, eligibility, and requirements change, so check the current position with the relevant institution or authority.