Formula
Subtotal = materials + labour + permits + tools/delivery/disposal. Contingency = subtotal x contingency percentage. Project estimate = subtotal + contingency.
Home Project Budget Calculator
Build a simple project estimate and see how much contingency adds before you start buying materials.
How to use the result
Use one row for the known quote and one for everything the quote excludes: delivery, disposal, fasteners, protective gear, repairs found during the job and extra paint or material waste.
Useful caution
A project budget is only as strong as the quote detail and measurements behind it. Check real supplier prices and contractor terms before committing money.
Use this number on the project planner
Start with one realistic quote, then run a cautious version with a higher contingency or a missing cost added. Copy both totals into the Home Project Budget Planner so you can compare the quote, not just remember the number.
Quick check
- Separate materials, labour, delivery, cleanup, fees and contingency.
- Check whether the quote includes the same items as your planner.
- Write down exclusions before treating the price as affordable.
Before you choose
Run the calculator once with the headline quote and once with a cautious buffer. If the project only fits in the optimistic version, the next step is to check the missing or uncertain line before committing money.
This page is a planning check only. For building, electrical, gas, legal, insurance or safety questions, use the right professional or official document.
What belongs in the estimate
A useful home project estimate separates the obvious price from the surrounding costs. Materials and labour may be the biggest lines, but delivery, tool hire, dust sheets, fixings, waste removal, parking, access time and small repairs can still change the final number.
If you have two quotes, do not compare them until the same rows are visible in both. One quote may include preparation and cleanup while another assumes you will supply materials or handle disposal yourself.
Use the printable planner after calculating. It gives you space to write the exclusions, questions and contingency percentage that are easy to forget when a quote arrives by message or email.
For a do-it-yourself job, use the labour line for help you may still need: delivery assistance, waste collection, tool hire time, specialist checks or the cost of correcting a mistake. For a paid job, use the same line to separate quoted labour from extra work that is not yet confirmed.
The point is not to make the project look expensive. It is to stop a missing row from making the first estimate look more certain than it really is.