When carrying out refurbishment work in domestic properties, it is easy for installers to become absorbed in the practicalities of the job without always giving equal attention to compliance and notification requirements. Yet within Competent Person Schemes (CPS), understanding what constitutes notifiable work is not simply a procedural step, it is a core part of professional practice, protecting both installer and homeowner alike.
At its simplest, notification provides a mechanism for demonstrating that work complies with the relevant Building Regulations without the need to involve local Building Control directly. For CPS-registered installers, this offers a more efficient route to compliance. However, that efficiency relies on correctly identifying which elements of refurbishment work fall within scope, something that is not always straightforward.
The regulatory framework underpinning this process is well established but can be nuanced in application. In England and Wales, notifiable work typically falls under the Building Regulations, particularly Approved Document G, which covers sanitation, hot water safety and water efficiency, and Approved Document L, which addresses the conservation of fuel and power. In certain cases, Part J, relating to combustion appliances, may also apply. While these requirements are relatively clear in new-build scenarios, refurbishment projects often introduce layers of complexity. Installers are frequently working with legacy systems, partial upgrades and the constraints of existing building fabric, all of which can make it more difficult to determine where the boundary lies between routine work and regulated activity.
In practice, a number of common refurbishment activities will trigger notification. The installation or replacement of a heating appliance remains one of the most prominent examples. Whether it is a like-for-like boiler replacement, the installation of a heat pump, or a transition from a regular system to a combi boiler, the act of installing a heat-producing appliance is itself notifiable. This is the case even where associated changes to pipework appear minimal and it is an area where assumptions can easily lead to non-compliance.
Similarly, the installation or replacement of an unvented hot water storage system is always notifiable due to the safety implications involved. These systems operate under pressure and, if installed incorrectly, can present significant risks. As such, installers must hold the appropriate G3 qualification and ensure that all work is notified through their CPS provider, regardless of whether the cylinder forms part of a new system or is being integrated into an existing one.
Heating system alterations present another area where refurbishment work can move into notifiable territory. Converting a gravity-fed system to a pressurised setup, installing underfloor heating or reconfiguring system layouts to accommodate new building arrangements are all common interventions. Where such changes materially affect system performance or energy efficiency, they fall within the scope of Part L. This is particularly relevant when new zones are introduced or when controls are upgraded, as these elements play a critical role in overall system efficiency.
The increasing adoption of low-carbon technologies is also shaping the notification landscape. Refurbishment projects are often seen as an opportunity to modernise heating systems, with heat pumps and solar thermal installations becoming more prevalent. These technologies bring with them specific design and performance requirements and notification ensures that compliance is formally recorded. As the push towards decarbonisation gathers pace, this area is likely to become even more significant.
Even work that might initially appear routine can carry regulatory implications. Alterations affecting hot water safety, such as changes to discharge pipework from temperature and pressure relief valves, may require notification, particularly where existing systems are being upgraded to meet current standards. Likewise, more substantial changes to sanitary systems, including the installation of new bathrooms or the relocation of existing facilities, can fall within scope where they impact drainage, ventilation or water efficiency.
That said, not all refurbishment work is notifiable. Day-to-day maintenance and minor alterations, such as replacing radiators on a like-for-like basis, carrying out small-scale pipework repairs, or swapping taps and sanitary fittings, will generally sit outside the requirements. The challenge lies in recognising how quickly the scope of work can evolve. What begins as a straightforward task can develop into something more complex, particularly if it leads to wider system changes such as rebalancing, zoning adjustments or control upgrades. At that point, the work may well cross the threshold into notifiable territory.
This is where professional judgement becomes essential. Notification should not be viewed as an administrative burden, but as an integral component of delivering compliant, high-quality work. It provides assurance that installations meet current regulatory standards, offers homeowners documented evidence of compliance and reinforces the credibility of the installer. It also serves as an important safeguard, reducing the risk of enforcement action, disputes or complications during future property transactions.
Refurbishment projects, by their nature, often present grey areas. Installers are working with systems that may pre-date current regulations and it is not always immediately clear whether a particular intervention constitutes a simple repair or a regulated upgrade. In these situations, a cautious and informed approach is advisable. Where there is any uncertainty, treating the work as notifiable and seeking guidance, whether through CPS providers such as APHC or technical support services, can help avoid problems later on.
As the industry continues to evolve, driven by higher efficiency standards and the transition towards low-carbon heating, refurbishment work is becoming increasingly complex. Installers are no longer simply maintaining or replacing systems, they are upgrading, integrating and future-proofing them within the constraints of existing buildings. With this shift comes a greater need for clarity around regulatory responsibilities, particularly in relation to notification.
For those operating under a Competent Person Scheme, understanding what is and is not notifiable is not a peripheral concern. It is a fundamental aspect of professional practice. By approaching refurbishment work with a clear awareness of these requirements, installers can ensure they remain compliant, protect their reputation and deliver outcomes that provide lasting confidence for their customers.