Fill in the dimensions for your job - length, width, height, or whatever fields the calculator asks for. All measurements are in metres and millimetres unless stated. Want a head start? Try a Quick Start Project Kit - pre-built job templates that load common specs in one click.
2
Adjust the waste allowance
Most calculators include a waste percentage field. The default is a recommended starting point - increase it for complex cuts or awkward layouts, reduce it for simple runs.
3
Click Calculate
Your material quantities appear instantly. Results show packs, bags, or units needed, plus the total area or volume for reference.
4
Add UK market prices (optional)
Click Get UK Market Prices if the option appears. This loads current trade rates and gives you a cost estimate alongside your quantities. You can edit any of the prices before calculating if your own rates differ.
5
Save to a project
Click Save to Project to store these results. You can create a new project or add the line to an existing one. You can save one project for free, or upgrade to a Pro account to store as many as you need with cloud backup and access across all your devices.
6
Print or export
Use the Print or Export CSV buttons to save your results. The print layout is clean and formatted for site use or handing to a client.
Your saved projects are under My Projects in the menu. Each project collects all your calculator results in one place - handy for pricing up a full job. You can freely amend any part of a project at any point. With a Pro account you can also send polished quotes to clients or material specs direct to subcontractors.
Greater London Borough
Kensington and Chelsea Planning & Building Contacts
The second smallest London borough by area, with over 4,000 listed buildings, around 40 conservation areas covering the vast majority of the built environment, and the most intensive planning scrutiny of any residential borough in England.
Kensington and Chelsea Council - local planning authority for the borough
Permitted development rights are removed across virtually the entire borough through a comprehensive network of Article 4 Directions. Planning permission is required for extensions, roof alterations, changes to windows and doors, and many other works that would be permitted development elsewhere. Pre-application advice is essential for any project in RBKC.
Kensington and Chelsea Council - Planning
Kensington Town Hall, Hornton Street, London, W8 7NX
RBKC has the highest concentration of listed buildings of any London borough - over 4,000, covering around 50% of all buildings in the borough. Around 40 conservation areas cover almost the entire built environment. Basement developments have been a major planning issue - the borough has specific basement policy. The Chelsea and Kensington riversides have significant amenity and flood risk considerations. Notting Hill, Portobello Road and Holland Park are particularly sensitive planning areas.
Building regulations approval is required for most structural work, extensions, loft conversions, new windows and heating system changes. You may use either the council's own building control service or a private Approved Inspector. For listed buildings, building control must be coordinated with Listed Building Consent requirements.
Heritage
Listed buildings, conservation areas and historic environment
Historic England - London Office
Statutory consultee for listed buildings and scheduled monuments
The Royal Hospital Chelsea (Grade I, Christopher Wren) is among the most significant buildings in the borough. Leighton House Museum (Grade II*) and Holland House (Grade II*) are notable cultural heritage assets. Kensington Palace (Grade II*) sits on the borough boundary. The borough's Victorian and Georgian terraces in Chelsea, Kensington and Notting Hill represent some of the finest residential architecture in the world. Around 40 conservation areas protect almost the entire historic built environment. Listed Building Consent is required in addition to planning permission for any works to a listed building that would affect its special architectural or historic interest, including internal works.
Flood risk in Kensington and Chelsea is primarily from the tidal Thames along the Chelsea Embankment. Chelsea Embankment properties and lower-lying streets near the river lie within Flood Zone 3. The Counters Creek (now culverted under Warwick Road) creates some residual surface water flood risk. Check the flood map for any development near the Thames or in lower-lying areas of the borough.
Local Professionals for Kensington and Chelsea
Vetted specialists with experience working in this borough
Kensington and Chelsea's exceptional heritage environment, ultra-high-value residential market and intensive planning regime create consistent demand for RIBA and RTPI chartered professionals experienced in the borough's complex requirements. All slots are currently available - enquire to feature your practice on this page.
Architects
Architect slot available
Promote your practice to Kensington and Chelsea homeowners
Reach people actively planning extensions, loft conversions and refurbishments across SW1X, SW3, SW5, SW7, SW10, W8, W11, W14.
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