Estimate example · Residential building

Construction Estimate Template: House Extension

A 10-page construction estimate for a two-storey house extension: assumptions, scope, itemised costs, provisional sums, contingency and programme.

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At a glance

This example in numbers

About this example

This example is the estimate a residential builder gives homeowners in Albuquerque, New Mexico, for a two-storey extension: a family room that opens from the kitchen, with a main bedroom suite above it, 800 square feet in all, priced from the architect's drawings and a site visit.

Homeowners compare estimates line by line, so this one is built to be checked. The covering letter says what the price is based on and how unknown conditions are handled. A project summary gives the size, the programme and the estimated total, followed by the assumptions behind the price. The scope says what is built and what is excluded, and a room table shows what the owners get. The estimate itself runs through six cost groups, from site and foundations to preliminaries and fees, with measured quantities, unit rates, a 5% contingency and New Mexico gross receipts tax. Provisional sums set budgets for the finishes still to be chosen, three alternatives are priced on their own, and the estimate closes with a 16-week programme, the owners' questions, the terms and an acceptance block.

Who it is for

House builders, renovation firms and main contractors who estimate extensions, refurbishments and new homes from drawings for homeowners.

Inside and how to use it

What this example contains, and how to make it yours

What's inside

  • A covering letter that names the drawings and site visit behind the price
  • A project summary and the assumptions the estimate depends on
  • Scope of work with exclusions, and the rooms being built
  • Line-item costs in six groups, with quantities, contingency and tax
  • Provisional sums for unchosen finishes and three priced alternatives
  • An estimated programme, questions, terms and acceptance

How to adapt it

  • List the drawing revision and the site visit your quantities come from
  • Write down every assumption that would change the price
  • Use provisional sums for finishes the client has not chosen yet
  • Price alternatives separately so the base total stays comparable

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