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Alpha Controls - BMS Install Specialists
BMS Fitout London

BMS Fitout in London: Building Controls That Keep Your Programme Moving

Trend, Distech, and Siemens certified BMS subcontractor for Cat A and Cat B fitout projects across London. We arrive on programme, commission clean, and hand over a system that works. SafeContractor approved. BCIA members.

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What BMS Fitout Work Actually Involves

BMS fitout is not just swapping out a controller. On a serious London office fitout — whether Cat A shell and core or a full Cat B tenant fit — the controls scope covers a lot of ground.

FCU and AHU controls sit at the heart of most projects. Fan coil unit control multiplied across multiple floors adds up fast. AHU controls are more involved: supply and extract fans, heating and cooling coils, economiser sequences, frost protection, and CO₂-based demand-controlled ventilation all need to be correctly sequenced and tuned. Commissioning is where all of this either works or does not.

BMS field bus and IP network design and installation
Trend IQ, Distech ECB/ECLYPSE, Siemens PXC controller installation
FCU and AHU controls — sequences, setpoints, tuning
CO₂-based demand-controlled ventilation
BEMS integration — BACnet/IP, Modbus, sub-metering
Cat A shell-and-core controls delivery
Cat B tenant fit-out controls to any specification
O&M documentation and hands-on building manager handover

Why London Fitout Is Its Own Challenge

London commercial fitout has pressures that do not exist on a ground-up new build. The buildings are occupied. Access is restricted. The base build BMS is often a legacy system — ten, fifteen years old — and the landlord has opinions about what goes on their network.

There is a hard distinction between the landlord BMS and the tenant BMS. Getting that interface wrong — wrong permissions, wrong points, wrong protocol — causes problems that follow the building for years. We manage that interface directly.

Weekend working is not optional in occupied London buildings. The programme gives you Saturday and Sunday, and that is it. If you miss your slot, you are back in the queue for three weeks. We are used to that rhythm.

What Alpha Controls Brings to a London Fitout

Programme-Focused
On a fitout job, the BMS scope is always on the critical path. We plan our work around the programme — what needs doing before the ceilings go in, what follows, and what the hard stops are for witnessing and sign-off.
Weekend Working as Standard
In occupied London buildings, access is Saturday and Sunday. We have engineers available for weekend access, we carry the relevant RAMS, we've been through the induction, and we turn up on Sunday morning.
Three-Platform Certification
Trend, Distech Controls, and Siemens — the three most common BMS platforms across the London commercial market. We can work on whatever the base build specifies and integrate with whatever the tenant wants.
Clean Commissioning
Point-by-point commissioning schedules with witnessed sign-off, setpoint lists, network topology drawings, and a head-end that reflects the as-built condition. No outstanding actions dressed up as snagging items.

Project: Pinsent Masons, London

Pinsent Masons, the international law firm, required a full FCU controls upgrade across 16 floors of their London offices — a complex project in a fully occupied building with strict access conditions. Access was restricted to weekends only for the duration of the installation and commissioning works.

We installed Trend IQ controllers throughout, integrated with the existing base build supervisor, and deployed LightFi wireless sensors to eliminate the need for new cable infrastructure in finished ceiling spaces — a significant programme and cost saving on a building where ceiling access was difficult. Commissioning was completed floor by floor as access allowed, with witnessed sign-off at each stage. The building manager had a fully functional, documented system from day one.

See the full Pinsent Masons case study →

Standards We Work To

BSRIA BG 11/2010 sets out the requirements for structured commissioning that bridges the gap between construction and operation. It specifically requires commissioning records completed and verified before handover, and that the building management team is trained to operate the system. On many London fitout projects, this step is missed entirely.

CIBSE Guide H — the primary technical reference for BMS design, specification and commissioning in the UK — requires the control system to demonstrate operation within design parameters. That is the standard we commission to.

For tenant fitout projects that include metered energy data, the requirements of Approved Document L (Part L) for new fit-out works also apply — particularly around sub-metering, time scheduling, and optimum start.

Further Reading

Case Studies

Frequently Asked Questions — BMS Fitout London

What is the difference between Cat A and Cat B BMS scope?

A Cat A BMS spec typically delivers a base level of controls to each floor — FCU controls, basic lighting, small power — ready for tenant configuration. Cat B means the tenant is fitting out to their own standard: a richer controls spec, integration with workplace management systems, CO₂ and air quality monitoring, and sometimes bespoke strategies for specific spaces like boardrooms, server rooms, or trading floors.

How does Alpha Controls handle the interface between landlord and tenant BMS?

There is a hard distinction between the landlord BMS (base build plant — chillers, cooling towers, primary AHUs, lifts) and the tenant BMS (floor-by-floor controls installed during fit-out). Getting the interface wrong — wrong permissions, wrong points mapped, wrong protocol — creates problems that follow the building for years. Alpha Controls manages this interface directly, liaising with the landlord's BMS contractor to agree the demarcation and integration points before installation begins.

Can Alpha Controls work in occupied commercial buildings at weekends?

Yes. Weekend working is a standard part of how we operate. Our engineers carry current CSCS cards and IPAF certification, hold SafeContractor approval, and are familiar with the permit-to-work and access induction requirements of major London commercial buildings. We do not sub-contract weekend work.

What commissioning standard does Alpha Controls work to on fitout projects?

We commission to BSRIA BG 11/2010 — the commissioning management guide that specifies functional testing against actual design intent under realistic operating conditions, witnessed sign-off, and documented handover. We also follow CIBSE Guide H's requirements for point schedules, operator interface standards, and O&M documentation. These are the standards building managers and compliance auditors expect to see.

Does Alpha Controls handle BEMS integration and sub-metering on fitout projects?

Yes. BEMS integration and sub-metering are standard scope on most London office fitouts. Landlords require sub-metering data; tenants want dashboard visibility; Approved Document L Part L requires metering for new fit-out works. We handle the protocol integration (BACnet/IP, Modbus, or whatever the base build uses), map the points correctly, and make sure the data on the head-end reflects reality.

Work With a BMS Contractor That Delivers on Programme

If you have a London fitout project that needs a BMS sub who will show up, commission properly and hand over a system that works — we are ready to talk.

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