BMS contractor for theCity 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.
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 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.
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.
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.
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.
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.
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.
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.
Read the bms service pageA 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.
Read the bms installation pageA 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.
Read the bms call out pageBMS 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.
Read the bms pre-design pageA 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.
Read the bms projects pageBMS 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.
Read the bms panel manufacturing pageBMS 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.
Read the bms software & graphics pageBMS 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.
Read the bms electrical installation pageBMS 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.
Read the bms maintenance pageConcrete 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.
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.
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.
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.
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.
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.
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.
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.
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.
How we deliver BMS workacross City of London.
- Step 01Enquiry & 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.
- Step 02Site or specification review
For anything beyond routine reactive work we visit or review drawings before quoting. No 'from' prices, no per-square-metre guessing.
- Step 03Written fixed quote
Quote on application, in writing, with a fixed scope, deliverables and programme. Insurances and RAMS supplied on request.
- Step 04Mobilisation & 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.
- Step 05Commissioning & handover
Points schedule, controls narrative, as-installed drawings and O&M documentation issued at handover. Nothing left informal.
- Step 06Aftercare & PPM
1-year workmanship warranty on installed works. PPM contracts with 2-hour SLA and written service reports available across the borough.
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 areasBMS in City of London,questions answered.
Anything not covered here? Call us on 07500 040578.
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?
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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?
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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?
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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?
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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?
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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?
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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?
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£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?
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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.
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.