Estimate example · Residential construction

Construction Estimate Template: Home Addition

A 10-page construction estimate for an 800 sq ft home addition: assumptions, scope, line-item costs, allowances, contingency, alternates and schedule.

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At a glance

This estimate in numbers

About this example

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

Homeowners compare estimates line by line, so this one is built to be checked. The cover letter says what the price is based on and how unknown conditions are handled. A project summary gives the size, the schedule 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 foundation to general conditions and fees, with measured quantities, unit prices, a 5% contingency and New Mexico gross receipts tax. Allowances set budgets for the finishes still to be chosen, three alternates are priced on their own, and the estimate closes with a 16-week schedule, the owners' questions, the terms and an acceptance block.

Who it is for

Home builders, remodelers and general contractors who estimate additions, renovations and new homes from plans for homeowners.

Inside and how to use it

What this example contains, and how to make it yours

What's inside

  • A cover letter that names the plans 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
  • Allowances for unchosen finishes and three priced alternates
  • An estimated schedule, questions, terms and acceptance

How to adapt it

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

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