What belongs in this estimate
A project budget is easier to review when the major cost categories and contingency are separated. This calculator combines material, labor, equipment, delivery, and disposal estimates, then applies tax to the categories you identify as taxable. It adds a contingency to the resulting pre-contingency total so you can see the reserve instead of burying it inside every line. All prices are user-entered estimates in US dollars; the tool does not supply local market rates. Replace rough allowances with supplier and contractor quotes as the project develops and keep scope changes visible in a new estimate.
Read the home project budget outputs
- Budget including contingency
- The budget includes the selected contingency applied by the stated formula.
- Costs before tax
- Pre-tax cost is separate from the taxable base.
- Estimated tax
- Tax follows the entered tax treatment, which must match the quote.
- Contingency reserve
- A reserve is a budgeting provision, not an already committed expense.
- Total before contingency
- Use the pre-contingency subtotal to compare the underlying priced scope.
Build the cost inputs
- Collect separate estimates for each cost category.
- Identify the actual taxable base rather than automatically taxing all labor.
- Choose a contingency and compare the reserve with unresolved scope risks.
Cost basis and worked budget
A worked example
$4,800 of entered costs plus 8% tax on a $2,750 taxable base gives $5,020 before contingency. A 15% reserve adds $753 for a $5,773 budget.
Home Project Budget: what changes the result?
Change a single assumption before carrying a number into the project plan. The comparisons below are calculated from this page’s default example. Each row changes only the named input; all other inputs stay at their displayed example values. These are mathematical scenarios, not measurements from a completed project.
| Changed assumption | Default input | Comparison input | Result: default → comparison |
|---|---|---|---|
| Materials | 2,500 USD | 3,000 USD | Budget including contingency: 5,773 → 6,348 USD Costs before tax: 4,800 → 5,300 USD |
| Labor | 1,800 USD | 2,160 USD | Budget including contingency: 5,773 → 6,187 USD Costs before tax: 4,800 → 5,160 USD |
| Equipment and rentals | 250 USD | 300 USD | Budget including contingency: 5,773 → 5,830.5 USD Costs before tax: 4,800 → 4,850 USD |
| Delivery | 100 USD | 120 USD | Budget including contingency: 5,773 → 5,796 USD Costs before tax: 4,800 → 4,820 USD |
Displayed values are rounded. Whole-pack results change in steps; continuous quantities may change before a new pack is needed. To compare your actual project, enter your dimensions above, save a scenario, then change one assumption.
Scope, exclusions and quote checks
- Contingency is a budget reserve, not an instruction to spend the amount or a guarantee against overruns.
- Do not enter a tax-inclusive quote and then tax it again. Convert or adjust the taxable base first.
- Permits, accommodation, design fees, and finance costs should be included in a suitable entered category if relevant.
Frequently asked questions
Does the budget calculator estimate local labor rates?
No. It calculates from your entered quotes or allowances and does not claim to know current local prices.
Is contingency added before or after tax?
Here it is added to the subtotal including the calculated tax, and the reserve is shown separately.
Why enter a taxable portion instead of taxing everything?
Tax rules and quote treatment vary. Entering the known taxable base avoids assuming that every category has the same treatment.
Read the project guides
- Build a Renovation Budget That Includes Waste, Tax, Delivery and Contingency
Turn material quantities and contractor quotes into a transparent home project budget with pack rounding, tax treatment, delivery, disposal, and visible contingency.
Calculation method: JICWH methodology. Examples are planning assumptions, not product recommendations.