--- title: "BMS Service London: Scheduled Servicing & Optimisation | BIAV Controls" description: "BMS service visits across London and the South East. Sensor checks, control-loop tuning, software back-ups and written reports. 24/7 phones answered. 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We don't publish 'from' prices: send us the site details or an asset list and we'll issue a written quote on application." } }, { "@type": "Question", "name": "How long does a service visit take?", "acceptedAnswer": { "@type": "Answer", "text": "A small commercial site is typically a half-day; a hospital plantroom or multi-riser office is one to two full days per visit. We agree scope and duration in writing before we book." } }, { "@type": "Question", "name": "Do you offer PPM contracts with SLAs?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Planned Preventive Maintenance contracts are offered with defined SLAs, including 2-hour on-site response for critical clients such as NHS trusts, plus remote monitoring between visits." } }, { "@type": "Question", "name": "Do you back up our BMS software off-site?", "acceptedAnswer": { "@type": "Answer", "text": "Every service visit closes with an off-site back-up of graphics, databases, controller programs and Niagara stations. If your supervisor dies tomorrow, we restore it; we don't rebuild from memory." } }, { "@type": "Question", "name": "What's the workmanship guarantee?", "acceptedAnswer": { "@type": "Answer", "text": "One-year workmanship warranty on remedial work carried out during service, on top of the manufacturers' equipment warranties." } }, { "@type": "Question", "name": "Do you cover out-of-hours emergencies?", "acceptedAnswer": { "@type": "Answer", "text": "Phones are answered 24/7, 365. Contract clients get contractual response times; reactive non-contract call-outs are responded to within 24 hours." } }, { "@type": "Question", "name": "Can you service a BMS you didn't install?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, most of our service book is on systems we didn't originally install. We work across Tridium Niagara, Distech, ABB, Mitsubishi Electric, Phoenix Contact, iSMA Controlli and any BACnet/Modbus/KNX/LON/M-Bus system." } }, { "@type": "Question", "name": "How often should a BMS be serviced?", "acceptedAnswer": { "@type": "Answer", "text": "Twice a year is the pragmatic minimum for a commercial building; quarterly for healthcare, data centres and complex mixed-use sites. We agree the frequency in the SLA and stick to it." } } ] } ] --- 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) ![BIAV Controls engineer's laptop running Trend IQVision alongside a legacy Trend IQ BMS panel during a service visit](/__l5e/assets-v1/be0f2c1f-fae5-4e12-af7f-63546d418c76/This_is_a_service_visit_on_a_old_Bms_system.jpeg) BMS Service · London & the South East # BMS service visits that keep London plantrooms compliant, efficient and audit-ready. Structured service visits with written reports, control-strategy tuning and back-ups, so your building runs the way it was commissioned to, not the way it drifted to. [Request a Quote](/contact) [Call 07782 247022](tel:+447782247022) 13+ years hands-on BMS experience 2-hour on-site SLA for contract clients 1-year workmanship warranty 1. [Home ](/) 2. [Services](/services) 3. BMS Service 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 Service overview ## BMS Service, explainedwithout the marketing gloss. What it is 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. Who it's for Building owners, landlords, facilities managers, healthcare trusts and M&E contractors responsible for commercial offices, hospitals, schools, data centres, retail units, leisure sites, industrial buildings and residential blocks across London. When you need it Any BMS installed more than twelve months ago, running out-of-hours setpoints that no one has audited, showing rising energy bills, generating recurring nuisance alarms, or approaching a lease/regulatory audit. Systems drift within weeks of go-live if no one is watching them. Why professional matters A BMS is a live system, not a static installation. Sensors go out of calibration, actuators seize, valves pass, schedules get overridden, and software back-ups age out. Left alone a controls system quietly costs money, usually through unnecessary heating, cooling and fan runtime, long before it fails outright. The cost of ignoring it ## What happens whenthis gets left alone. Skipping structured BMS service does not save money. It defers it into bigger bills and bigger call-outs. Risks & cost escalation - Sensors that read three or four degrees out force plant to run continuously, adding thousands of pounds per year in unnecessary heating, cooling and fan energy. - Passing valves, jammed actuators and stuck dampers cause simultaneous heating and cooling: the single biggest hidden cost in a commercial building. - Missing software back-ups mean a supervisor failure becomes a rebuild-from-scratch job, not a restore, taking days instead of hours. - Uncontrolled overrides left in place after last winter's fault silently kill efficiency and mask real problems from the alarm log. - An unaudited BMS in an NHS or landlord environment fails compliance evidence checks; insurers and auditors expect a documented service record. Common mistakes we see - × Assuming the original commissioning file still reflects site: it rarely does more than a year in. - × Only calling an engineer when something breaks; by then energy has already been wasted for months. - × Letting a general M&E contractor tick a BMS box on a mechanical PPM visit without a controls engineer actually on the front-end. - × No off-site back-up of graphics, database or Niagara station; a single hard-drive failure wipes years of setup. Our process ## How we deliverbms service. 1. Step 01 Pre-visit review We remotely review alarm history, trend data and previous reports before we arrive, so the visit targets real issues rather than a generic checklist. 2. Step 02 On-site inspection Physical checks on sensors, actuators, valves, dampers, VSDs, controllers and network devices. Everything is walked and verified, not just the front-end screen. 3. Step 03 Optimisation Control loops re-tuned, setpoints and schedules brought back to design intent, overrides cleared, alarm thresholds sanity-checked. 4. Step 04 Software back-up Graphics, databases, controller programs and Niagara stations backed up off-site, so a supervisor failure is a restore, not a rebuild. 5. Step 05 Written report Every visit closes with a written report: what was found, what was changed, what needs follow-up, and any recommendations for savings or upgrades. 6. Step 06 Follow-up & warranty One-year workmanship warranty on any remedial work carried out, with remote-monitoring visibility for contract clients between visits. Outcomes you can measure ## What the right bms serviceactually gives you. Lower energy bills Correctly calibrated sensors and tuned loops routinely take 10–25% off HVAC energy without a single piece of new plant. Fewer nuisance alarms Cleaned-up alarm thresholds mean the alarms that do fire actually matter: engineers stop ignoring the console. Longer plant life Removing hunting loops and simultaneous heat/cool events reduces mechanical wear on valves, actuators, compressors and fans. Audit-ready records Written service reports and off-site back-ups sit ready for insurance, landlord and regulatory audits. Fast recovery Documented, backed-up systems restore in hours after a failure instead of days spent reverse-engineering the site. Peace of mind Phones are answered 24/7 and contract clients see engineers on-site within two hours, including out-of-hours. Scope & specifics ## Detail thatbuyers ask about. BMS service is not one job: the scope varies by protocol, controller family, supervisor platform and the sectors the building sits in. Materials, methods & standards All work is performed by controls engineers, not general M&E technicians. Panels supplied or worked on are built to BS EN 61439. Electrical touches are carried out by partner electricians holding NICEIC, NAPIT, ECA, ECS and CSCS credentials as applicable. Insurance covers £20M public liability, £10M employers' liability and £10M professional indemnity. Residential vs commercial Residential blocks tend to prioritise landlord-side plant (heat networks, communal AHUs, boosted cold water and stair-pressurisation) and tenant-comfort feedback loops, whereas commercial offices, data centres and healthcare demand tighter documentation, tenant-metering integrity, and formal SLAs on response. Tridium Niagara service Station back-ups, module updates, JACE health checks, driver and licence audit, graphics housekeeping and history-database maintenance on N4 and AX platforms. Distech Controls & ECLYPSE Controller firmware audits, EC-Net / EC-gfxProgram back-ups, wireless sensor mesh checks and BACnet/IP integration review. Legacy BACnet / Modbus / KNX / LON / M-Bus systems Vendor-independent servicing across every open protocol we work with: no lock-in to a single manufacturer's engineering tool. Metering & energy sub-systems Circutor, Janitza, Eastron and Hobut meter health, pulse-input integrity and M&T dashboard sanity checks on SkySpark / N4 Energy Manager. Wireless & IoT sensors Battery, RSSI and gateway health on ELSYS, Enless, Milesight, Watteco and Thermokon devices supplied through our Forest Rock partnership. Healthcare & NHS service Structured to meet NHS contract SLAs, including 2-hour on-site response for critical plantrooms, with engineers experienced in occupied hospital environments. Related services [BMS Maintenance](/services/bms-maintenance) [BMS Call Out](/services/bms-call-out) [BMS Software & Graphics](/services/bms-software-graphics) Recent work ## BMS Serviceon real sites. ![Trend 963/Advance BMS head-end supervisor inspected on a service visit to an older system](/__l5e/assets-v1/877bbfc5-e197-4e7d-809c-2ae16fd393c8/Another_service_visit_on_a_old_system1.jpeg)![Legacy Ser-Tec BMS motor control panel with pilot lights and touchscreen HMI checked on a service visit](/__l5e/assets-v1/1e1b814d-b997-4aa9-80ea-9f52b86b03f7/Another_service_visit_on_a_old_system2.jpeg)![Commercial plantroom with Grundfos pumps and Siemens actuators inspected during a BMS service visit](/__l5e/assets-v1/21610a49-a752-4c3d-9f49-44ce2b9dd4f4/Another_service_visit_on_a_old_system3.jpeg)![Motor control panel serving boiler shunt and constant-temperature pumps checked on a service visit](/__l5e/assets-v1/03995c8c-575a-4dad-8e90-02719e98d795/Another_service_visit_on_a_old_system4.jpeg)![Legacy Trend IQ BMS panel being serviced with a laptop running Trend IQVision strategy software](/__l5e/assets-v1/be0f2c1f-fae5-4e12-af7f-63546d418c76/This_is_a_service_visit_on_a_old_Bms_system.jpeg)![Legacy BMS panel with Trend outstation and fuse banks inspected during a scheduled service visit](/__l5e/assets-v1/db8864f9-69fb-4c54-a00b-c2fa8208358b/This_is_a_service_visit_on_a_old_Bms_system2.jpeg)![Legacy Clarkson Controls BMS pilot-light mimic with boiler, pump and fan status inspected on a service visit](/__l5e/assets-v1/68b92999-6736-443a-bb80-42f660c92d99/This_is_a_service_visit_on_a_old_Bms_system3.jpeg) Coverage ### Delivered across London & the South East Based in Swanley on the London/Kent border. Engineers cover the City, the South East London boroughs, north-west Kent and beyond. [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)[City of London ](/service-areas/city-of-london)[Canary Wharf ](/service-areas/canary-wharf) FAQs ## BMS Servicequestions, answered. Anything not covered here? Call us on [07782 247022](tel:+447782247022). Pricing BMS work is bespoke and project-based; pricing is **quote on application**, issued in writing after a site or specification review. ### How much does a BMS service cost in London? + BMS servicing is bespoke and priced by site size, controller count, protocol mix and SLA. We don't publish 'from' prices: send us the site details or an asset list and we'll issue a written quote on application. ### How long does a service visit take? + A small commercial site is typically a half-day; a hospital plantroom or multi-riser office is one to two full days per visit. We agree scope and duration in writing before we book. ### Do you offer PPM contracts with SLAs? + Yes. Planned Preventive Maintenance contracts are offered with defined SLAs, including 2-hour on-site response for critical clients such as NHS trusts, plus remote monitoring between visits. ### Do you back up our BMS software off-site? + Every service visit closes with an off-site back-up of graphics, databases, controller programs and Niagara stations. If your supervisor dies tomorrow, we restore it; we don't rebuild from memory. ### What's the workmanship guarantee? + One-year workmanship warranty on remedial work carried out during service, on top of the manufacturers' equipment warranties. ### Do you cover out-of-hours emergencies? + Phones are answered 24/7, 365. Contract clients get contractual response times; reactive non-contract call-outs are responded to within 24 hours. ### Can you service a BMS you didn't install? + Yes, most of our service book is on systems we didn't originally install. We work across Tridium Niagara, Distech, ABB, Mitsubishi Electric, Phoenix Contact, iSMA Controlli and any BACnet/Modbus/KNX/LON/M-Bus system. ### How often should a BMS be serviced? + Twice a year is the pragmatic minimum for a commercial building; quarterly for healthcare, data centres and complex mixed-use sites. We agree the frequency in the SLA and stick to it. Request a quote ## Send us the spec.We'll come back with a fixed scope. Every bms service 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 Service enquiry 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) - [City of London](/service-areas/city-of-london) - [Canary Wharf](/service-areas/canary-wharf) Company - [About](/about) - [Our Work](/our-work) - [Case Studies](/case-studies) - [FAQs](/faq) - [Contact](/contact) - [Leave a review](https://search.google.com/local/writereview?placeid=ChIJDUK3gbWt2EcRTEnbDZS2st8) Hours: 24/7 Company No. 16344714 © 2026 BIAV Controls Limited. 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