Mossbury Road, Battersea, London

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Roof Extension in a Victorian Terraced House

The Project

Our client wished to extend their privately-owned, Victorian terraced house from a two-storey to a three-storey property, to gain a bedroom with an en-suite bathroom.

The Challenge

The development plans required additional fire safety measures to be installed throughout the property, to increase life-saving travel distances that comply with Building Regulations.

This could be achieved in three ways:

Option 1: Install a 60-minute fire resisting stud wall partitioning (£1,500), plus 6FD30s fire door sets (£1,500) and fire alarms (£450).
Estimated cost: £3,450 + VAT and labour.
Pros: This would be the cheapest option – overall.
Cons: The stairwell would be become an enclosed and dark space, instead of retaining a lighter, open-plan living space that the client desired.

Option 2: Replacing the current period banisters and spindles with a wall of fire resisting Pyro Glazing throughout the height of the stairwell (£5,500 – £7,000), plus 6FD30s fire doors (£1,500) and fire alarms (£450).
Estimated cost: £7,450 – £8,950 + VAT and labour.
Pros: This would create the appearance of a light, open space and maintain fire separation.
Cons: This would be the most expensive option. Plus, the property would lose the period stairwell design features.

Option 3: Install a residential fire sprinkler system. This could be achieved using the Lumi-Plugin Downlights with integrated Rapidrop concealed sprinkler heads and fire alarms.
Estimated cost: (£3,800) + VAT and labour.
(NB: In some cases, the mains water pressure to the dwelling may not be sufficient, so may require an upgrade to the dwelling’s water supply or require a water tank.)
Pros: This option would provide the essential fire safety without compromising on the interior design. The Lumi-Plugin fire sprinkler system would act as a compensatory feature, allowing for tenable conditions to be maintained throughout the height of the dwelling, whilst conserving the open plan space on the ground floor and period stairwell features.
Cons: None.

The chosen option

As open plan design with the extension was a priority, our client chose option three – Lumi-Plugin Downlights + Sprinklers. Ensuring peace of mind that the property would be fully protected and enabling our client to take advantage of their ideal design specifications, while simultaneously complying with safety standards. Our innovative Sprinkler Plugins were used as a compensatory feature , that offered a discrete, unobtrusive and streamlining finish to the overall interior design.


“Lumi-Plugin has allowed us to keep the open plan we liked without spoiling the look of the period building. In fact, you can’t see the sprinklers or the fire alarms as they are hidden in the ceiling lights. The system is great.”