London Plumbing and Building Regulations: Which Plumbing Work Needs Approval?
Not all plumbing work in London requires Building Regulations approval, but some categories do and failure to notify can have serious consequences when you sell. This guide explains which London plumbing jobs are notifiable and what the approval process involves.
Why Building Regulations Apply to Some Plumbing Work
Building Regulations are national standards that set minimum requirements for health, safety, energy efficiency, and structural integrity in construction and building work. They apply to new buildings and to certain categories of work carried out on existing buildings. Plumbing and heating work falls within the scope of the Building Regulations in specific circumstances, primarily where the work involves the installation of new heating systems, the modification of drainage systems, the installation of pressurised hot water systems, or the installation of new bathrooms or kitchen facilities involving drainage connections.
The requirement for Building Regulations compliance in plumbing work is not a bureaucratic formality. The regulations ensure that the work meets minimum standards for water quality, drainage performance, energy efficiency, and safety. When compliance is required and not obtained, the building owner has failed to meet a legal obligation. This failure is typically recorded on the property when it is sold, because the buyer conveyancing search will reveal whether relevant building works were completed with the required approvals in place. Absent or retroactive Building Regulations approval is a common cause of delays and renegotiations in London property sales.
Work That Requires Building Regulations Notification in London
The installation of a new boiler, whether replacement or first-time installation, requires Building Regulations compliance. In practice, this is typically discharged through the competent person scheme operated by Gas Safe registered engineers, who can self-certify their work under the Gas Safe competent person scheme. When a Gas Safe engineer installs a boiler in London, they notify the relevant local authority on your behalf as part of the installation and issue a completion certificate. No separate application to Building Control is required provided the engineer uses the self-certification route.
The installation of an unvented hot water cylinder also requires Building Regulations compliance, specifically under Part G of the Building Regulations covering sanitation and water supply. As with boilers, engineers holding the G3 Unvented Hot Water qualification can self-certify through the relevant competent person scheme, discharging the Building Regulations requirement as part of the installation process. The homeowner should receive a Building Regulations completion certificate following the installation.
New drainage connections, including the addition of a new WC, bath, shower, or sink where a new connection to the drainage system is required, fall under Part H of the Building Regulations covering drainage and waste disposal. This work is also notifiable, though again competent person scheme self-certification is available for plumbers who hold the relevant accreditation. New drainage work that is not self-certified requires a formal application to Building Control and an inspection by a Building Control officer before the work is covered over.
Work That Does Not Require Building Regulations Approval
Like-for-like replacement of existing plumbing components, such as replacing a boiler of the same type in the same location or replacing a tap, toilet flush mechanism, or shower valve without any drainage modification, generally does not require Building Regulations notification. Replacing a radiator, adding a towel rail to an existing central heating circuit, or replacing a section of pipework that has failed due to corrosion or mechanical damage are all maintenance activities that do not trigger Building Regulations requirements.
The Water Regulations, which are separate from the Building Regulations, impose their own notification requirements for certain plumbing work including the installation of a bidet with a sub-rim supply, the installation of a garden irrigation system with an automatic replenishment feed, or any work involving a cross-connection between the mains supply and a secondary supply. These Water Regulations notification requirements exist to protect the wholesome quality of the mains water supply and must be complied with independently of any Building Regulations obligations.
What Happens If Notifiable Work Is Not Notified
Failure to obtain Building Regulations approval for notifiable work does not make the work illegal in all circumstances, but it creates a potential problem when the property is sold. The buyer solicitor will carry out a building regulations search that will reveal any consents that should have been obtained but were not. Depending on how the buyer and their conveyancer approach the issue, this can result in a request for indemnity insurance, a price renegotiation, or in some cases the requirement to open up and expose the work for retrospective inspection. Retrospective inspection of concealed drainage or pipework can be expensive and disruptive.
The simplest protection is to use qualified engineers who operate under the relevant competent person schemes, ensuring that all notifiable work is certified at the point of installation. Prestige Engineers operate under the Gas Safe and relevant Competent Person schemes, notifying all relevant Building Regulations work and issuing completion certificates as a standard part of every qualifying installation across London.