---
title: "BMS Contractor City of London - Installation, Service &amp; 24/7 Call-Out | BIAV Controls"
description: "BMS contractor covering the City of London: installations, service, maintenance and 24/7 reactive call-out for Square Mile offices, trading floors and heritage buildings. 2-hour SLA for contract clients."
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52 Selah Drive, Swanley, BR8 7WD 24/7 phones answered · 2hr SLA response 

[accounts@biav-controls.co.uk](mailto:accounts@biav-controls.co.uk)[](https://www.instagram.com/biav_controls)[](https://www.linkedin.com/in/bradley-thomas-62a0901b6/)

[![BIAV Controls](/__l5e/assets-v1/aa32365b-edd5-4700-8950-51fcbb3a024c/biav-logo.webp)](/)

Services

Service Areas

[About](/about)

Our Work

[Contact](/contact)

[07782 247022](tel:+447782247022)[Request a Quote](/contact)

![City of London financial district skyline at dusk with towers around Bank junction](/assets/city-of-london-Dvs0v4am.jpg)

BMS contractor · City of London · EC1, EC2, EC3, EC4 

# BMS contractor for the City of London. Trading floors, towers, listed façades. 

Square Mile buildings run to a different tempo: high-density occupancy, tenant SLAs, heritage constraints and out-of-hours access. We service, install, maintain and reactively cover BMS across EC1 to EC4 without pausing your operation.

[Request a Quote](/contact) [Call 07782 247022](tel:+447782247022)

2-hour on-site SLA for contract clients  24/7 phones answered by an engineer  Quote on application, in writing 

1.  [Home ](/)
2.  [Service Areas](/service-areas)
3.  City of London 

13+

Years hands-on BMS experience

2 hr

On-site SLA for contract clients

24/7

Phones answered, every day

£20M

Public liability insurance

BS EN 61439

Panel build standard

Local relevance 

## BMS engineers whoactually know City of London. 

Based in Swanley on the London/Kent border: 45–60 minutes off-peak from Swanley; engineers already on-site across the City most working days. We work across Bank, Liverpool Street, Aldgate, St Paul's and the wider the City of London on installation, service, maintenance and reactive call-out.

We cover City of London

We cover every EC postcode, from the fringe at Farringdon, Barbican and Aldgate through the core around Bank, Liverpool Street, St Paul's and Cannon Street. Engineers move through the City daily on service, call-out and project visits; we're not routing in from another region when you need us.

Response times

Contract clients in the City receive a 2-hour on-site response and 24/7 phones answered by an engineer, not an answer service. Reactive callers are prioritised within 24 hours. Out-of-hours access, permit-to-work, escort requirements and CoL security protocols are already familiar to our engineers.

City of London property types

Grade A commercial towers, mid-rise post-war office refurbishments, listed façade-retained rebuilds, trading floors, chambers, livery halls and dense retail podiums. We work around Cat-A/Cat-B fit-outs, MEP landlord-vs-tenant demarcations and the strict noise, dust and delivery windows City managing agents enforce.

Common BMS needs in City of London

Sensor drift on VAV boxes serving open-plan floors, chiller sequencing on multi-tenant risers, AHU control strategies tuned for the free-cooling windows the City actually gets, out-of-hours setpoint audits ahead of ESG reporting, and reactive BMS call-outs when a tenant SLA clock is running.

On the ground in City of London 

## A closer look at how we work across the City of London.

BIAV Controls is a specialist Building Management System contractor based in Swanley, on the London/Kent border. We install, service, maintain and reactively cover BMS across City of London, the whole of the City of London, including Bank, Liverpool Street, Aldgate, St Paul's and the surrounding EC1, EC2, EC3, EC4 postcode area. The business was set up to deliver a specific standard of BMS work: open protocol, transparent scoping, written documentation, and engineers who actually turn up when they said they would.

Our engineers have 13+ years of hands-on BMS experience across every major open-protocol platform: Tridium Niagara, Trend, Siemens (Desigo and Talon), Distech, Cylon and Honeywell, plus any BACnet, Modbus or LonWorks device that touches a plantroom. That platform coverage matters in City of London because the borough's estate is mixed: modern buildings tend to be on current Tridium supervisors, mid-generation buildings run legacy Trend, and older civic and industrial stock often sits on Siemens or Cylon. One contractor comfortable across all of them saves you the pain of stitching together sub-contractors and losing accountability at the boundaries.

Every project we deliver in City of London carries the same commercial and technical guardrails. Public liability is insured to £20M, employers' liability to £10M and professional indemnity to £10M. Control panels are designed in-house and manufactured to BS EN 61439 by our panel-shop partner. Installed workmanship carries a 1-year warranty. Pricing is quote on application, issued in writing after a real site or specification review, not pulled from a rate card, and we do not tie buildings to a proprietary supervisor.

Contract clients across Central London receive a 2-hour on-site SLA and 24/7 phone cover answered by an engineer rather than an answer service. Reactive callers without a contract are prioritised within 24 hours. For City of London specifically, 45–60 minutes off-peak from Swanley; engineers already on-site across the City most working days, so response commitments are grounded in real travel time rather than optimistic mapping. If a site sits inside the EC1, EC2, EC3, EC4 postcode range, we are already routing engineers past it most working days.

Beyond City of London itself, our regular coverage extends across Central London and into neighbouring boroughs, including South East London, Greenwich, Bromley, so multi-site clients get consistent delivery, one contractor and one paper trail across their estate. If you're weighing us against a national roll-up, the practical difference is that our office is a short drive from your building, our engineers know the borough's road network and access regimes, and there is no chain of sub-contractors between the person you speak to and the person on-site.

Services available 

## Every BMS service we offer,delivered in City of London. 

All nine BMS services are available across the City of London. Click through for full scope, process and FAQs on each.

[![BIAV Controls laptop running Trend IQVision alongside a legacy Trend IQ BMS panel during a scheduled service visit](/__l5e/assets-v1/be0f2c1f-fae5-4e12-af7f-63546d418c76/This_is_a_service_visit_on_a_old_Bms_system.jpeg)

BMS Service in City of London

A BMS service is a planned visit by a controls engineer who checks every sub-system on the Building Management System: sensors, actuators, dampers, valves, control loops, schedules, alarms, network health and supervisor software, then corrects setpoints, resolves faults and issues a written service report.

View service





](/services/bms-service)[![Six Hamworthy Stratton condensing boilers on a new LTHW system, all controlled from the BMS by BIAV Controls](/__l5e/assets-v1/b84023a1-9470-4e8b-aa95-9a52fd602068/Recent_project_works_LTHW_system_6_boilers_all_controlled_from_Bms2.jpeg)

BMS Installation in City of London

A BMS installation is the full end-to-end delivery of a Building Management System: design of the control philosophy, manufacture of controls panels to BS EN 61439, containment and cabling, controller mounting, sensor and valve fit-off, software engineering, graphics build, commissioning, witness testing and formal handover.

View service





](/services/bms-installation)[![Trend IQView4 HMI showing an active AHU Common Fault alarm attended on a 24/7 BMS call-out](/__l5e/assets-v1/52077a86-d494-4089-a291-676bc7275e13/Another_call_out_for_a_alarm_on_AHU_system.jpeg)

BMS Call Out in City of London

A BMS call-out is an urgent visit to diagnose and rectify a fault on the Building Management System or the plant it controls: no-heat, no-cooling, comms failure, supervisor crash, alarm storm, network dropout or safety interlock trip.

View service





](/services/bms-call-out)[![Chilled water secondary pump and chilled-beam BMS mimic developed at pre-design stage](/__l5e/assets-v1/6dbf1d01-ef52-4dbc-aeaf-7015f1dcfbf8/Software_Graphic_Designs3.jpeg)

BMS Pre-Design in City of London

BMS pre-design is the engineering document set that defines exactly how a Building Management System will control every piece of plant on a project: point counts, control sequences, setpoints, alarm strategy, interlocks, protocol strategy, graphics scope and commissioning checklist.

View service





](/services/bms-pre-design)[![70 Gray's Inn Road, London: a BIAV Controls end-to-end BMS site optimisation project](/__l5e/assets-v1/aa1cf3e5-3a17-4777-9d1b-1bad04b277f2/Completed_full_site_optimisation_works_at_70_greys_in_and_added_touch_15_inch_touch_display_screens_to_7_tentsnt_floors_to_give_them_full_control_of_there_system4.jpeg)

BMS Projects in City of London

A BMS project is single-point delivery of every controls scope on a construction or refurbishment programme: pre-design, panel manufacture, electrical installation, controller and sensor fit-off, software engineering, graphics, commissioning, witness testing, handover and post-handover service.

View service





](/services/bms-projects)[![BIAV-designed BMS control panel with INNON HMI, boiler and secondary pump status, built to BS EN 61439](/__l5e/assets-v1/e87b4a38-bbb0-4601-a8f1-37d98d28bbd4/Panel_controlling_the_boilers.jpeg)

BMS Panel Manufacturing in City of London

BMS panel manufacturing is the design and build of the enclosures that house the Building Management System's controllers, contactors, protection, power supplies, network devices and terminations, engineered specifically for the plant they control and the site they will live in.

View service





](/services/bms-panel-manufacturing)[![AHU02A BMS mimic graphic designed by BIAV Controls for Royal London Hospital (NHS Skanska)](/__l5e/assets-v1/46ed4ee4-5ecc-4e16-a126-7a929733520b/Software_Graphic_Designs2.jpeg)

BMS Software & Graphics in City of London

BMS software and graphics is the code and visual front-end that sits on top of a Building Management System: controller programming, supervisor engineering (Tridium Niagara, Distech EC-Net and equivalents), graphics build, alarm schema, trends, histories, schedules and dashboards.

View service





](/services/bms-software-graphics)[![iSMA-Niagara BMS controller with dressed terminals and containment on a school ASHP electrical installation](/__l5e/assets-v1/7699f4cc-ce46-4c3d-a017-f993de9cacc8/Small_project_from_a_air_source_heat_pump_system_in_local_school1.jpeg)

BMS Electrical Installation in City of London

BMS electrical installation is the containment, cabling, terminations and testing that physically connects a Building Management System to the plant it controls, from panel to controller to field device, plus power distribution and safety earthing.

View service





](/services/bms-electrical-installation)[![Commercial LTHW plantroom with Grundfos pumps and Siemens actuators maintained under a PPM contract](/__l5e/assets-v1/21610a49-a752-4c3d-9f49-44ce2b9dd4f4/Another_service_visit_on_a_old_system3.jpeg)

BMS Maintenance in City of London

BMS maintenance is a contracted programme of planned service visits, remote monitoring, reactive call-out and post-incident review, with defined SLAs and written reports, that keeps a Building Management System delivering the outcomes it was designed to deliver.

View service





](/services/bms-maintenance)[![15-inch touch display screens installed on tenant floors at 70 Gray's Inn Road as part of a BMS site optimisation project](/__l5e/assets-v1/8cb152a7-db95-4bb7-99da-1907b1d8e0d9/Completed_full_site_optimisation_works_at_70_greys_in_and_added_touch_15_inch_touch_display_screens_to_7_tentsnt_floors_to_give_them_full_control_of_there_system1.jpeg)

BMS Energy Optimisation in City of London

BMS energy optimisation is a structured programme of audit, correction and verification carried out on an existing Building Management System.

View service





](/services/bms-energy-optimisation)

Why choose us in City of London 

## Concrete reasons,not marketing lines. 

Every claim on this page is drawn from things we can evidence: our insurances, our SLAs, our warranty terms and the standards our panels and partner electricians work to.

Familiar with City managing agents

Our engineers work routinely under CBRE, JLL, Savills and Knight Frank operational regimes: permits, RAMS, escorted access and out-of-hours windows are standard operating procedure, not a learning curve.

Open-protocol, no lock-in

We install and service on Tridium Niagara, Trend, Siemens, Distech and Cylon. Your City building doesn't get chained to one vendor; you can move contractor whenever you choose.

Documented and audit-ready

Every visit generates a written service report; every panel we build is to BS EN 61439; every install carries a 1-year workmanship warranty. That's the paperwork ESG audits, tenant queries and lease reviews actually need.

Local problems, honestly 

## BMS issues we seeacross City of London. 

City of London BMS problems cluster around three realities: extreme occupancy density, buildings that have been refurbished four or five times, and tenant SLAs that make any downtime commercially visible within hours.

Layered control systems from repeated refurbishments

Many City buildings carry a Trend outstation from the 1990s bolted onto a Tridium supervisor from a 2015 refit, feeding a tenant-installed Distech overlay on a 2022 Cat-B. Nobody has the full picture until someone actually maps it. That is usually where we start.

Trading-floor and dealing-room control

High internal gains, tight temperature bands, redundant cooling paths and 24/7 occupancy patterns. Off-the-shelf control strategies don't fit; they need tuning against the actual load profile, not the design intent from a decade ago.

Heritage and listed-building constraints

Livery halls, façade-retained schemes and listed interiors restrict where sensors, actuators and cabling can go. We route around fabric restrictions rather than through them, and we keep the paperwork tidy for future consent applications.

Landlord/tenant demarcation disputes

When a floor is warm at 09:30, the fastest question is: whose kit is it? A clean BMS points schedule and a current controls narrative make that answerable in minutes, not days. We produce both as standard deliverables.

Our process 

## How we deliver BMS workacross City of London. 

1.  Step 01
    
    Enquiry & scoping call
    
    We take the site details for City of London, current issues and any relevant plant or supervisor information, usually inside a short call.
    
2.  Step 02
    
    Site or specification review
    
    For anything beyond routine reactive work we visit or review drawings before quoting. No 'from' prices, no per-square-metre guessing.
    
3.  Step 03
    
    Written fixed quote
    
    Quote on application, in writing, with a fixed scope, deliverables and programme. Insurances and RAMS supplied on request.
    
4.  Step 04
    
    Mobilisation & delivery
    
    Engineers mobilised to City of London with permits, RAMS and, where relevant, panel design and manufacture to BS EN 61439 via our panel-shop partner.
    
5.  Step 05
    
    Commissioning & handover
    
    Points schedule, controls narrative, as-installed drawings and O&M documentation issued at handover. Nothing left informal.
    
6.  Step 06
    
    Aftercare & PPM
    
    1-year workmanship warranty on installed works. PPM contracts with 2-hour SLA and written service reports available across the borough.
    

Regional coverage 

### Also working nearby to City of London.

Our engineers cover Central London and the wider London & South East region on the same terms: 2-hour SLA for contract clients, 24/7 phones, quote on application.

[View all service areas](/service-areas)

[

South East London

BMS in South East London

SE1–SE28 · BR · DA

](/service-areas/south-east-london)[

South East London

BMS in Greenwich

SE3, SE7, SE9, SE10, SE18, SE28

](/service-areas/greenwich)[

South East London

BMS in Bromley

BR1, BR2, BR3, BR4, BR5, BR6, BR7, BR8

](/service-areas/bromley)

FAQs 

## BMS in City of London,questions answered. 

Anything not covered here? Call us on [07782 247022](tel:+447782247022).

Pricing

BMS work in City of London is quoted on application, issued in writing after a site or specification review. No 'from' prices, no per-square-metre pricing, no proprietary lock-in.

### Do you serve the City of London?

+ 

Yes: every EC postcode. From Farringdon and Barbican across Bank, Liverpool Street, St Paul's and Cannon Street. Engineers cover the Square Mile daily on service, project and reactive work.

### How fast can you reach the City of London?

+ 

Contract clients receive a 2-hour on-site SLA. Because our engineers move through the City on scheduled work, in practice we're often on-site sooner. Reactive callers are prioritised within 24 hours.

### How much does BMS work cost in the City of London?

+ 

Every BMS enquiry is quoted on application after a site or specification review, issued in writing with a fixed scope. City projects vary widely with heritage constraints, tenant demarcation and out-of-hours access requirements; we scope those in, not around.

### Do you offer emergency BMS call-out in the City of London?

+ 

Yes. Phones are answered 24/7 by an engineer, every day of the year. Contract clients receive a 2-hour on-site response; reactive enquiries within 24 hours.

### Can you work out-of-hours in the Square Mile?

+ 

Yes. Most of our City call-outs and cut-overs run on weekends or between 20:00 and 06:00 to protect tenant operations. Permit-to-work, escorted access and RAMS documentation are standard on every visit.

### Which BMS platforms do you support in the City?

+ 

Tridium Niagara, Trend, Siemens (Desigo, Talon), Distech Controls, Cylon and Honeywell, plus any BACnet, Modbus or LonWorks device. Open protocol only. We do not lock buildings to a single vendor.

### Do you carry the insurance City managing agents ask for?

+ 

£20M public liability, £10M employers' liability and £10M professional indemnity. Certificates and RAMS are issued ahead of every project mobilisation.

### Can you produce written service reports and audit documentation?

+ 

Yes: every service visit closes with a written report covering points tested, faults found, actions taken and recommendations. Panel work is built to BS EN 61439. All workmanship carries a 1-year warranty.

Request a quote: City of London 

## Send us the spec.We'll come back with a fixed scope. 

Every City of London enquiry is scoped and quoted in writing: no 'from' prices, no hidden variations, no proprietary lock-in. Response within one working day, sooner for anything urgent.

[Call 07782 247022](tel:+447782247022)[Full contact details](/contact)

24/7 phones answered

£20M PL / £10M PI cover

1-year workmanship warranty

BMS enquiry · City of London

Tell us about the site.

![BIAV Controls](/__l5e/assets-v1/aa32365b-edd5-4700-8950-51fcbb3a024c/biav-logo.webp)

Family-run BMS specialist delivering smart, energy-efficient solutions to support net zero buildings across London and the South East. Bespoke design, BS EN 61439 panels, open-protocol systems.

[07782 247022 ](tel:+447782247022)[accounts@biav-controls.co.uk](mailto:accounts@biav-controls.co.uk)

52 Selah Drive  
Swanley, Sevenoaks  
BR8 7WD 

[](https://www.instagram.com/biav_controls)[](https://www.linkedin.com/in/bradley-thomas-62a0901b6/)

Services

-   [BMS Service](/services/bms-service)
-   [BMS Installation](/services/bms-installation)
-   [BMS Call Out](/services/bms-call-out)
-   [BMS Pre-Design](/services/bms-pre-design)
-   [BMS Projects](/services/bms-projects)
-   [BMS Panel Manufacturing](/services/bms-panel-manufacturing)
-   [BMS Software & Graphics](/services/bms-software-graphics)
-   [BMS Electrical Installation](/services/bms-electrical-installation)
-   [BMS Maintenance](/services/bms-maintenance)
-   [BMS Energy Optimisation](/services/bms-energy-optimisation)

Service Areas

-   [Swanley](/service-areas/swanley)
-   [Dartford](/service-areas/dartford)
-   [Sevenoaks](/service-areas/sevenoaks)
-   [Orpington](/service-areas/orpington)
-   [Sidcup](/service-areas/sidcup)
-   [Bexley](/service-areas/bexley)
-   [Bromley](/service-areas/bromley)
-   [Greenwich](/service-areas/greenwich)
-   [Croydon](/service-areas/croydon)
-   [Gravesend](/service-areas/gravesend)
-   [South East London](/service-areas/south-east-london)
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