A Construction Method Statement explains how the basement will be built; a Construction Management Plan explains how the site will operate and its effects will be controlled. The names can overlap, so read the council's requirements and the actual planning condition rather than relying on the document's title. [1] [2]
The construction method
For a basement, the technical method needs to coordinate excavation, temporary support, the permanent structure and the stability of adjoining buildings. HSE requires alteration and excavation work to be planned around those risks, including the possibility that temporary conditions are more vulnerable than the finished arrangement. [3] [4]
Ask the engineer and contractor to identify the construction sequence and the checks needed before progressing. A planning statement saying that underpinning will be used is not the same thing as a site-ready temporary works design. The Temporary Works Forum's underpinning guidance explains the importance of defined responsibilities and properly planned temporary conditions. [5]
Managing the site and neighbourhood
The management plan addresses matters such as deliveries, spoil removal, access, noise, dust and communication. Kensington & Chelsea's Code of Construction Practice requires relevant projects to complete its checklist and Site Construction Management Plan in accordance with the planning condition. [2]
Make the plan specific to the street and property. Ask how materials and waste will move without obstructing the agreed access, where vehicles will stop and who handles complaints. These should be workable arrangements for the contractor, not statements copied from a larger site with different access. [2] [6]
Westminster's 2026 change
Westminster's revised Code of Construction Practice applies to new sites from 1 June 2026 and existing sites from 1 September 2026. The council's page explains how the revised requirements apply to construction management and site environmental management submissions. A project should therefore check the applicable version even if its planning application began earlier. [6]
The code is a current requirement, not a future proposal. Its existence does not remove separate duties concerning structural design, worker safety or the neighbours' property. [6] [7]
Who prepares and maintains the documents?
The structural and temporary works specialists should provide the engineering content, while the contractor contributes practical sequencing and site logistics. The principal designer and principal contractor roles require coordination of design and building work within their respective responsibilities. [8]
For the client, the useful check is whether the people who will carry out the project have accepted the proposed method and logistics. Record who revises each document when the footprint, access or construction technique changes. Keeping these responsibilities clear helps the site team work to the latest agreed design. [8]
Before work starts
Check whether a planning condition requires written approval of the relevant plan before commencement. Keep the condition approval with the construction documents and make sure the site team is using that version. Kensington & Chelsea's published code process expressly links submission and approval to the start of relevant works. [2]
Keep the engineering method, the site management plan and the party wall arrangements consistent. A management plan cannot grant rights over a neighbour's land or replace an agreement or award needed under the Party Wall Act. [9]