Widening is measured as the length of the run multiplied by the extra width. A long narrow strip can involve more edge work per square metre than a rectangular driveway. Use the dedicated calculator to explore a guide budget for the work described below.
Estimate driveway widening from the measurements and work options below. Guide allowances are already included; a contractor’s quote is not required to use the tool.
Check boundaries and the road access arrangement before deciding where the extra width can be built.
Guide model reviewed 7 November 2026. VAT treatment varies between published guides and supplier quotes; no VAT is added automatically. Add it only where your allowances exclude it.
The selected surface guide is multiplied by the measured area. It is an early installation allowance, not a named-product quotation. Ordinary preparation must not be added twice. Existing-surface breakout, abnormal ground, engineered drainage, boundaries and highway work need their own agreed scope where excluded.
View the published guide used for the main allowance. Optional allowances are budgeting estimates and can differ from a site-specific quotation.
Use a measured specification to compare prices for your property. Ask contractors to confirm the work, preparation, materials, access, disposal and any exclusions before agreeing a price.
Driveway Widening planned around your property
Widening is measured as the length of the run multiplied by the extra width. A long narrow strip can involve more edge work per square metre than a rectangular driveway.
Check boundaries and the road access arrangement before deciding where the extra width can be built.
Widening is measured as the length of the run multiplied by the extra width. A long narrow strip can involve more edge work per square metre than a rectangular driveway.
Check boundaries and the road access arrangement before deciding where the extra width can be built.
Measure only the added strip or extension. Multiply its length by the additional width, rather than entering the area of the driveway that will remain. Split an irregular extension into rectangular sections and calculate each section separately.
The selected surface guide is multiplied by the measured area. It is an early installation allowance, not a named-product quotation. Ordinary preparation must not be added twice. Existing-surface breakout, abnormal ground, engineered drainage, boundaries and highway work need their own agreed scope where excluded.
The first guide option is gravel widening. Its allowance is £40–£70 for the relevant unit shown in the result. This is a published-guide starting point; it is not a price offered by a contractor on this website.
The available work options are gravel widening; tarmac widening; concrete widening; block paving widening; resin-bound widening. Select the one that matches the proposed scope before comparing the result.
The results show the measured quantity, the selected work allowance and any separately selected items. A volume, unit count or coverage result is a quantity check, not a construction design. Where the model uses a minimum visit allowance or whole bags, the displayed total will not fall in direct proportion to a very small area.
Use the optional contingency to make a separate budget provision. Add a quoted fixed allowance only for work outside the model’s stated scope. Check the VAT basis before selecting the VAT adjustment.
Give contractors the same measurements and work description. Ask them to identify the main work, preparation, disposal, access requirements, drainage and any making-good that applies to this project. An apparent saving can simply mean that a different part of the scope has been priced.
Check boundaries and the road access arrangement before deciding where the extra width can be built. Keep the agreed specification with the quote, including any exclusions and the way changes discovered during the work will be authorised.
Examples use the specification named on each card, the calculator’s example measurements and guide allowances. Optional extras, contingency and VAT adjustment are off. Supply-only models exclude installation.
The selected surface guide is multiplied by the measured area. It is an early installation allowance, not a named-product quotation. Ordinary preparation must not be added twice. Existing-surface breakout, abnormal ground, engineered drainage, boundaries and highway work need their own agreed scope where excluded.
Measure only the added strip or extension. Multiply its length by the additional width, rather than entering the area of the driveway that will remain. Split an irregular extension into rectangular sections and calculate each section separately.
Widening is measured as the length of the run multiplied by the extra width. A long narrow strip can involve more edge work per square metre than a rectangular driveway. Check boundaries and the road access arrangement before deciding where the extra width can be built.
The figures are early budgeting allowances for the work described in the selected option. Check boundaries and the road access arrangement before deciding where the extra width can be built. Ask a contractor to confirm the measured scope, access, preparation, materials and exclusions after assessing the property. The written quotation, rather than the calculator, establishes the work and the agreed price.
The result separates the main work from selected options and any additional allowance you enter. Do not add an item again if the main rate or contractor’s quote already includes it. Contingency is optional and is shown separately.
No extra VAT is added automatically. Published cost guides and supplier prices can use different VAT bases, so check the source and any written quotation. The optional VAT control adds 20% to the calculated allowances only when you select it. Leave it off when the rates or quotation already include VAT to avoid counting tax twice.
