How to Price a Dry Riser Installation: Labour, Materials and Margin Guide

Summary

A dry riser is an empty vertical pipe running through a building, from a ground-floor inlet (where the fire service connects a pump appliance) up to landing valve outlets on each floor, allowing firefighters to charge the system with water at street level rather than running hose the full height of the building. It is fixed fire-fighting infrastructure rather than a general plumbing installation, and while the pipework itself is a relatively simple system — no pump, no permanently pressurised water — the design, positioning, and testing requirements are unforgiving, because the system's only job is to work correctly during an actual fire.

This guide is aimed at fire protection contractors, mechanical contractors on new-build and refurbishment projects, and main contractors pricing dry riser installation as part of a wider fit-out or new-build package. It assumes routine fire mains — buildings between 18m and 50m in height — where a dry riser is the compliant option; above 50m, Approved Document B requires a wet riser instead (a permanently water-filled system with a pumped supply), which is a materially different and more expensive system, briefly noted here but not the focus of this guide.

Pricing this job correctly starts with getting the design right before quoting: number of storeys, number of landing valve outlets per floor (single outlet on smaller floor plates, twin outlets on larger ones), pipe diameter (100mm standard, up to 150mm where multiple outlets are served per floor or the building has particular flow requirements), and the inlet/collecting head location and enclosure at ground level. None of these decisions are the installer's alone to make freely — they follow directly from BS 9990:2015 and should be agreed with the fire and rescue service and building control at design stage, not adjusted on site to suit convenient routing.

Key Facts

• Approved Document B threshold — a fire main (dry or wet riser) is required in England where the top occupied floor is more than 18m above fire service vehicle access level
• Dry riser upper limit — dry risers are permitted for buildings up to 50m in height above fire service access level; beyond 50m, a wet riser is mandatory because fire appliance pumps cannot reliably charge a dry system to that height
• BS 9990:2015 — the current British Standard for design, installation, testing and maintenance of wet and dry rising fire mains; the authoritative technical reference for this work, superseding the earlier BS 5306-1
• Pipe diameter — minimum 100mm internal diameter for a riser serving a single landing valve outlet per floor; 150mm minimum where more than one outlet is served per floor or on taller/larger risers
• Landing valve outlets — one per floor as a minimum on smaller floor plates; larger floor plates (typically over a defined travel distance from a single valve) need two outlets per floor, positioned in a protected stairway lobby or similar fire-fighting access point
• Landing valve specification — male-threaded outlet couplings (to prevent unauthorised removal/theft of hose connections), fitted with a landing valve incorporating a gate valve, positioned in a clearly marked, accessible cabinet
• Ground floor inlet (collecting head) — a minimum of two instantaneous male hose connections plus an automatic air release valve and a drain-down valve, positioned in a clearly signed enclosure on the building's exterior at a location accessible to a fire appliance
• Drain-down valve — required at the lowest point of the system to allow full draining after use or testing, preventing standing water and frost damage
• Automatic air release valve — fitted at the top of the riser to allow air to escape as the system is charged by the fire service pump, ensuring water reaches the top outlet promptly
• Materials — galvanised steel or another approved corrosion-resistant pipe material is standard; the system must withstand the test and operating pressures over its service life without corrosion-related failure
• Annual pressure test — BS 9990:2015 requires a full wet pressure test to 12 bar, held for a minimum of 15 minutes, checking for leaks at every joint and valve
• Six-monthly visual inspection — a visual check between annual pressure tests for vandalism, theft, corrosion, or damage to the inlet, landing valves, drain valves and signage
• Signage — the inlet enclosure and each landing valve must be clearly and permanently signed identifying it as dry riser fire-fighting equipment, per BS 9990:2015
• Fire and rescue service liaison — the local fire and rescue service should be consulted on riser design, inlet positioning and outlet locations at design stage; this isn't just good practice, many building control approvals expect evidence of this consultation
• Building Regulations application — dry riser installation on a new building or material alteration requires Building Regulations approval as part of the fire safety (Part B) submission, typically reviewed alongside the wider fire strategy
• Regulatory Reform (Fire Safety) Order 2005 — places an ongoing duty on the "responsible person" for an existing building to maintain fire-fighting equipment, including dry risers, in efficient working order — this is the legal basis for the ongoing testing regime after initial installation, not just a manufacturer recommendation
• Retrofitting to an existing building — installing a dry riser into an existing building without one (e.g. following a change of use or a fire risk assessment finding) is significantly more complex and costly than installing during new-build construction, due to routing through existing structure and finishes
• Commissioning certificate — a completed installation should be commissioned with a full pressure test and a certificate confirming compliance with BS 9990:2015, retained as part of the building's fire safety information for building control and the responsible person

Quick Reference Table

Figures are for the dry riser installation itself as part of a wider building project; on a new-build, this work is typically one package within a larger mechanical services contract, and pricing here reflects the riser and outlet/inlet equipment specifically, not the wider building fire strategy (sprinklers, alarm systems, compartmentation) covered elsewhere.

Detailed Guidance

Design comes before pricing — this is not a job to price from a floor count alone

Before quoting, confirm: total building height and number of storeys (which sets whether a dry or wet riser applies, and interacts with the fire strategy generally), floor plate size and travel distances (which determines single vs twin outlets per floor), pipe diameter required for the outlet configuration, and the agreed inlet location — typically confirmed with the local fire and rescue service, since they need reliable pump-appliance access to it in an emergency. A dry riser priced purely from a storey count without this design input risks a compliant-looking but practically wrong specification, which building control or the fire service can reject at inspection stage, turning a priced job into a costly redesign.

New-build versus retrofit — a large cost difference

Installing a dry riser during new-build construction is materially cheaper than retrofitting into a completed building, because the riser route, service risers/ducts, and landing valve cupboards can be built into the structure from the outset rather than cut into existing finishes. A retrofit into an occupied or completed building — following, for example, a fire risk assessment that identifies a missing fire main, or a change of use bringing a building above the 18m threshold — needs core-drilling or chasing through existing floors, working around existing services, and often out-of-hours access to minimise disruption to occupants. Price a retrofit as a distinct, higher-cost category rather than scaling new-build pricing by height alone.

Materials cost breakdown

• Riser pipework (galvanised steel, 100mm or 150mm diameter as specified) — priced per metre run; a taller riser is not simply "more of the same pipe," as wall thickness and bracing/support specification can change with height and pressure rating
• Landing valve assemblies — one per floor (or two on larger floor plates), each comprising the valve body, male instantaneous coupling(s), and a lockable/signed cabinet — typically £150-£350 per valve assembly supplied, before fitting labour
• Ground floor inlet/collecting head assembly — twin male instantaneous inlet couplings, automatic air release valve, drain-down valve, and a weatherproof, clearly signed enclosure — typically £400-£900 supplied
• Bracketry and fire-stopping — pipe supports at each floor penetration, plus fire-stopping material to maintain compartmentation where the riser passes through fire-separating floors (a critical detail — a riser pipe that breaches fire compartmentation without proper fire-stopping undermines the building's wider fire strategy, not just the riser itself)
• Signage — statutory dry riser identification signage at the inlet and each landing valve, a small but mandatory cost line often missed in early pricing

Testing, commissioning and ongoing servicing — price this as a separate, recurring line

A new dry riser installation must be commissioned with a full pressure test to 12 bar for a minimum of 15 minutes before being signed off and handed over, with a commissioning certificate forming part of the building's fire safety documentation. This is not the end of the pricing conversation — under the Regulatory Reform (Fire Safety) Order 2005, the building's "responsible person" has an ongoing legal duty to maintain the dry riser in efficient working order, which in practice means the annual pressure test and six-monthly visual inspection cycle set out in BS 9990:2015 continuing for the life of the building. Offer this as a maintenance contract alongside the initial installation quote — it's recurring revenue for the installer and a compliance safety net for the building owner, and a responsible person who isn't already aware of this ongoing duty will generally welcome having it explained clearly.

Common pricing pitfalls

• Quoting from storey count alone without confirming outlet configuration — a building with larger floor plates needing twin outlets per floor roughly doubles the landing valve cost against a single-outlet assumption
• Missing fire-stopping at floor penetrations — this is a compliance requirement in its own right (maintaining compartmentation), not an optional extra, and is a common item left off an early estimate
• Underestimating retrofit routing and access costs — treating a retrofit as "the same job, just in an existing building" consistently underprices the additional access, protection and out-of-hours working the job usually needs
• Not pricing the ongoing testing regime — a one-off installation quote that doesn't flag the mandatory annual/six-monthly testing leaves the responsible person unaware of an ongoing legal duty, and leaves you without the recurring servicing contract that naturally follows this job
• Skipping fire and rescue service consultation on inlet position — an inlet sited without confirming pump-appliance access with the local fire service risks a position that looks fine on a drawing but doesn't work operationally, discovered only at final inspection or, worse, in a real emergency

Worked pricing example: new-build 8-storey residential block, single outlet per floor

An 8-storey residential block (approximately 24m to the top floor, comfortably within the 18-50m dry riser band) with a compact floor plate needing only a single landing valve outlet per floor, riser installed during construction with clear service riser access.

• 100mm galvanised riser pipe, 8 floors plus ground-floor connection run, supply and fit: cost £1,400
• 8 landing valve assemblies (cabinet, valve, male coupling), supplied and fitted: cost £1,840
• Ground floor inlet/collecting head assembly, supplied and fitted, including enclosure and signage: cost £650
• Fire-stopping at 8 floor penetrations: cost £480
• Labour, fire protection engineer team, 3.5 days at £280/day cost rate each (2-person team): cost £1,960
• Commissioning pressure test and certification: cost £220

Total cost to the tradesperson: £6,550. Applying a 20-25% margin (reflecting the specialist, lower-competition nature of fire protection subcontract work, roughly £1,450) gives a quoted price to the main contractor of approximately £8,000, before VAT, subject to final confirmation of floor plate layout and any additional fire and rescue service requirements identified during design consultation. An ongoing annual test and six-monthly inspection contract would typically be quoted separately at £500-£900 per year for a building of this scale.

Frequently Asked Questions

How do I know if a building needs a dry riser or a wet riser?

The 18m and 50m thresholds in Approved Document B are the starting point: below 18m, no fire main is generally required (though sprinklers or other measures may still apply depending on use and height); between 18m and 50m, a dry riser is the standard compliant solution; above 50m, a wet riser is mandatory because fire appliance pumps cannot reliably charge a dry system to that height in the time needed. Always confirm the exact height measurement (from fire service vehicle access level to the top occupied floor, not ground level generally) and the building's specific use class with the project's fire engineer or building control before finalising which system applies — height measurement conventions and specific use-class exceptions can affect the answer.

Who is responsible for testing a dry riser after installation, and how often?

The "responsible person" for the building under the Regulatory Reform (Fire Safety) Order 2005 — typically the building owner, managing agent, or employer in a workplace — has an ongoing duty to keep the dry riser in efficient working order. In practice this means commissioning a specialist fire protection contractor (which may or may not be the original installer) to carry out the BS 9990:2015 annual pressure test and six-monthly visual inspections. This is a legal duty, not a discretionary maintenance choice, and failure to maintain fire-fighting equipment is an offence under the Order.

Can a dry riser be combined with other fire-fighting systems like sprinklers?

Yes — a dry riser is one component of a building's overall fire strategy and commonly coexists with sprinkler systems, fire alarms, and compartmentation, each addressing a different aspect of fire safety (a dry riser primarily serves the fire and rescue service's fire-fighting operation, while sprinklers are typically an automatic suppression system triggered independently). Design and price them as related but distinct systems, coordinated through the project's overall fire strategy rather than treated as interchangeable or overlapping.

What happens if a dry riser fails its annual pressure test?

A failed test — typically a leak at a joint, valve, or corrosion-related failure — must be repaired and the system retested before it can be certified as compliant. Because this is fire-fighting equipment the fire and rescue service relies on, a failed and unrepaired dry riser represents a genuine life-safety gap, not just a maintenance backlog item; the responsible person should treat a failed test as urgent, and a fire protection contractor identifying a fail should communicate that urgency clearly rather than filing it as a routine remedial item on a future visit.

Regulations & Standards

• Building Regulations Approved Document B (Fire safety) — sets the 18m/50m height thresholds triggering dry riser vs wet riser requirements

• BS 9990:2015 — Non-automatic fire-fighting systems in buildings — code of practice; the primary technical standard for design, installation, testing and maintenance of dry and wet risers, superseding BS 5306-1

• Regulatory Reform (Fire Safety) Order 2005 — statutory duty on the "responsible person" to maintain fire-fighting equipment, including dry risers, in efficient working order throughout the building's life

• BS 336:2010 — fire hose couplings, branch-pipe, nozzles and fittings for fire-fighting purposes; relevant to the instantaneous coupling specification used on landing valves and inlets

• Building Safety Act 2022 — relevant for higher-risk buildings (generally 18m+ residential), introducing additional golden thread documentation and accountable person duties that extend beyond the base Fire Safety Order requirements

• GOV.UK — Approved Document B: Fire Safety — official height thresholds and fire main requirements

• BAFSA — Wet & Dry Riser Designed to BS 9990 — British Automatic Fire Sprinkler Association technical guidance on riser design to BS 9990

• GOV.UK — Regulatory Reform (Fire Safety) Order 2005 — statutory maintenance duty for fire-fighting equipment

• GOV.UK — Building Safety Act 2022 guidance — higher-risk building duties relevant to dry riser documentation in qualifying residential buildings

• fire risk assessment — the 5-step fire risk assessment process that identifies whether a dry riser or other fire-fighting equipment is required or adequately maintained

• sprinkler systems — automatic suppression systems that commonly coexist with a dry riser as part of a building's wider fire strategy

• part b fire — full Approved Document B coverage of escape routes and fire resistance requirements alongside fire main provision

• fire door installation pricing guide — related fire safety compliance pricing guide covering certified fire doorsets, often specified alongside dry riser installations in the same building