Plan an extension budget, compare a cleaning quote or estimate annual car running costs using your own rates and assumptions.

Use your own quotes and estimates to compare budgets. These calculators do not supply market prices, postcode price adjustments or a vehicle valuation. Required fields are marked with an asterisk.

House extension budget

Enter your proposed floor area and the construction rate from a builder’s quote. Add the other project costs you expect, then choose a contingency percentage.

Measure the proposed new floor area.

For example, design, permissions or work outside the construction quote.

Formula: (floor area × quoted rate + other project costs) × (1 + contingency ÷ 100). Use costs on the same tax basis throughout.

Cleaning quote estimator

Compare a cleaner’s hourly quote with the total time you expect the work to take. Add any separately quoted extras.

Two cleaners for three hours is six total cleaner hours.

For example, carpet cleaning, oven cleaning or parking.

Formula: total cleaner hours × quoted hourly rate + extras. Confirm the work included and the final quote with the cleaner.

Car annual running cost

Estimate the running cost of a petrol or diesel car using your expected mileage and UK imperial miles per gallon. Enter costs that apply to you.

Use measured fuel economy where you have it. US mpg is a different unit.

If you include depreciation, avoid also counting finance capital repayments for the same ownership cost.

Fuel litres = annual miles ÷ UK mpg × 4.54609. Annual total = fuel cost + the annual costs entered + 12 monthly payments. This does not estimate a car’s market value.