Water Mist Systems for Open-Plan Kitchens
A water mist system for an open-plan kitchen can provide automatic fire suppression where walls, doors or traditional fire separation have been changed. NPHS supports homeowners, landlords, architects and builders with system review, design support, installation, commissioning and ongoing maintenance.
Send us your plans, Building Control comments or project details and we can review whether water mist, sprinklers or another fire suppression route is suitable.
Open-plan kitchen fire suppression for Building Control-led projects
Open-plan living often leads to a fire suppression discussion when kitchens, dining areas and living spaces are combined and traditional fire separation or escape protection changes.
This can happen during extensions, whole-house refurbishments, loft conversions or alterations that remove internal doors and walls.
Building Control may ask how the proposed layout protects occupants if fire starts in the kitchen and affects the main escape route.
NPHS can review the layout and advise whether a domestic water mist system, sprinkler system or another suppression route should be considered.
Do open-plan kitchens need sprinklers or water mist?
Some open-plan kitchen projects need automatic fire suppression because the design affects fire separation, protected escape routes or the wider fire safety strategy. The requirement should be confirmed for the individual property.
Fire separation changes
Removing doors and walls can reduce the separation between a kitchen fire and the route occupants use to leave the property.
Escape route changes
A kitchen located close to the main stair or escape path may need additional consideration as part of the overall design.
Project-specific solution
Alarms, doors, travel distances, construction, ventilation and automatic suppression may all form part of the agreed Building Control route.
“Our initial check looks at building use, fire strategy, water supply, available space and the relevant standard.”
Paul McFarling
Managing Director, NPHS
How can water mist support a Building Control route?
Water mist can form part of an open-plan fire safety proposal where automatic suppression is supported by the project design and accepted through the Building Control route.
The suppression system should be properly specified for the property and supported by relevant technical evidence.
NPHS can provide system information, layout input, installation details, commissioning records and maintenance requirements to support the wider project discussion.
Final acceptance remains with the relevant approving authority and should be confirmed before the installation route is fixed.
| Project evidence | What Building Control may need to understand |
|---|---|
| Property layout | Kitchen position, living space, stair, escape route and protected areas. |
| Suppression system | The proposed system type and areas intended to be protected. |
| Technical evidence | Relevant standard, fire-test evidence and manufacturer documentation. |
| Water supply | The proposed pump, supply and equipment arrangement. |
| Installation | Nozzle positions, pipe routes and equipment location. |
| Handover | Commissioning records and maintenance information after completion. |
Open-plan project route:
Automatic suppression should be considered as part of the overall fire safety design rather than treated as a standalone guarantee of approval.
Where may water mist be considered in open-plan homes?
Open-plan projects vary considerably. The suppression requirement often depends on what has changed elsewhere in the home.
Kitchen, dining and living area
Removing internal walls or doors can create one large space connected to the primary escape route.
Kitchen beside the stair
A fire in the kitchen may directly affect the route occupants on upper floors rely on for escape.
Loft conversion above
Adding another storey can change the protected stair requirements and make the ground-floor layout more significant.
Whole-house refurbishment
Suppression can be coordinated while ceilings, services and room layouts are already being altered.
Existing finished home
Water mist may still be possible where pipe routes, ceiling access and equipment space can be planned practically.
What standard applies to water mist for an open-plan kitchen?
Current domestic water mist projects should be considered against the BS EN 14972 framework, the relevant residential fire-test evidence and the specific Building Control route.
BS EN 14972-1:2020+A1:2025 provides the current framework for design, installation, inspection and maintenance of fixed land-based water mist systems.
BS EN 14972-17:2025 provides the current residential occupancy fire-test protocol for automatic nozzle water mist systems.
BS 8458:2015 was withdrawn by BSI in July 2025. Existing products previously independently tested and certified against it may still carry that evidence, so the status of a specific system should be reviewed rather than assumed.
Approved Document B, the property fire strategy and Building Control requirements may also affect the project route.
Read our Approved Document B sprinkler and water mist guidance →
Water mist vs an open-plan kitchen sprinkler system
Water mist and domestic sprinklers can both provide automatic fire suppression, but their water demand, pipework, equipment and standards routes differ.
The decision should be based on the property and agreed fire safety route rather than appearance or technology alone.
Fine droplets and smaller-bore pipework can suit domestic layouts with limited service space.
Conventional domestic sprinkler systems follow the BS 9251 route where sprinklers are selected.
Pump, storage and flow requirements can differ significantly between systems.
Existing ceilings, cupboards and service voids may influence which installation is easier to accommodate.
The proposed system should be supported by appropriate standards and test evidence for the application.
Both technologies need planned servicing and suitable records after installation.
NPHS can support an open-plan project at any stage
The enquiry does not need to begin before design. NPHS can step into an early Building Control discussion, an active refurbishment, an installation-ready project or an existing system that now needs inspection or servicing.
Still planning the layout?
Send drawings or sketches and NPHS can advise on system suitability, standards, water supply and installation considerations.
Already building?
We can review the current design, coordinate pipework and equipment, install the system and complete commissioning.
Already have a system?
NPHS can support system review, servicing, defect advice, maintenance records and future planned inspection.
Can water mist be retrofitted into an existing open-plan kitchen?
Water mist can often be retrofitted into an existing home, although the practical installation route depends on ceiling construction, existing services and equipment space.
Review access
Check ceilings, joists, service voids, cupboards and routes around existing finishes.
Plan pipework
Smaller-bore pipework can help where conventional service routes are limited.
Locate the equipment
Identify a suitable position for pump, controls and water supply equipment with maintenance access.
Coordinate the finish
Plan the installation around builders, ceilings, decoration and final nozzle locations.
Installation is often easier while refurbishment work is already underway, but finished homes can still be assessed for practical retrofit routes.
What affects the cost of water mist for an open-plan kitchen?
Cost depends on the protected area, property condition, water supply, equipment and installation route rather than simply the size of the kitchen.
Protected area
A single open-plan space and a whole-house suppression system have very different nozzle and pipework requirements.
Property stage
An open-ceiling refurbishment generally provides easier access than a fully decorated occupied home.
Pipe routes
Ceiling construction, joists, walls and other services affect installation time.
Pump and water supply
Equipment arrangement and available supply affect the final system design.
Project documentation
Building Control, commissioning and handover requirements form part of the complete scope.
Send NPHS your drawings and current project information for a project-specific price rather than relying on a generic open-plan kitchen figure.
What should be completed after installation?
The installed system needs to move from construction into a usable, maintainable home fire suppression system.
Commissioning, client information and maintenance requirements should therefore form part of the project scope.
NPHS can support the system after handover as well as during design and installation.
Commissioning+
Complete the relevant system checks and commissioning process before handover.
System records+
Provide relevant installation and commissioning information for the homeowner and project file.
User information+
Make sure the property owner understands the installed equipment and any access requirements.
Planned maintenance+
Set out inspection and servicing requirements for the system after completion.
Future alterations+
Review significant ceiling, layout or room-use changes that may affect the installed suppression system.
Why choose NPHS for open-plan kitchen fire suppression?
NPHS supports domestic suppression projects from the first Building Control question through design, installation, commissioning and long-term maintenance.
Homeowners and builders can come to us with early plans, an existing specification, an active installation project or an installed system that needs future servicing.
Because NPHS works with both water mist and sprinkler systems, we can assess the project against the building, available space and technical route rather than starting with one predetermined product.
Planning an open-plan kitchen or home refurbishment?
Send NPHS your plans, Building Control comments, fire strategy notes or photographs.
Whether you need early system advice, design support, installation, commissioning or maintenance of an existing system, we can review the project and advise on the next practical step.
FAQs
Do open-plan kitchens need sprinklers or water mist?
Some open-plan kitchen projects need automatic suppression where fire separation, the protected stair or escape arrangements have changed. The requirement depends on the property layout and agreed Building Control or fire strategy route.
Can water mist help with Building Control approval?
Water mist can support a Building Control proposal where the system is suitable and backed by appropriate standards, test evidence, design information and commissioning documentation. Final acceptance depends on the full project and approving authority.
Is a water mist system suitable for an open-plan kitchen?
Water mist may be suitable where the property, layout, ceiling conditions, protected areas and water supply fit the system’s tested application and project approval route. NPHS can review these details from drawings or site information.
Can water mist replace fire doors in an open-plan home?
Water mist may form part of an alternative fire safety approach where traditional separation is changing, but it should not be assumed to replace fire doors automatically. The overall arrangement needs agreement through Building Control or the appointed fire consultant.
Can a water mist system be retrofitted after the kitchen is finished?
Yes, water mist can often be retrofitted into finished homes. Ceiling access, pipe routes, equipment space and existing decoration affect the installation approach and potential disruption.
How much does water mist cost for an open-plan kitchen?
Cost depends on the protected area, nozzle quantity, water supply, pump arrangement, pipe routes, access and project documentation. NPHS can provide a project-specific quote after reviewing plans, photographs or site details.
Can NPHS help if my open-plan project is already underway?
Yes. NPHS can support projects at different stages, including early design review, active refurbishment, installation, commissioning and maintenance of existing systems. Send the information you have and we can advise on the next step.