The Office Refurbishment Checklist Every London Business Should Have

You’ve signed the lease extension. The board’s approved the budget. Now you’re staring at a half-empty floor plate wondering where to start. Office refurbishments in London aren’t like domestic jobs, you’re juggling landlord approvals, Part L compliance, fire regs, and a dozen other moving parts while trying not to shut down the business for three months.

We’ve been fitting out offices across London and Essex for two decades. Seen plenty of jobs run smoothly, seen a few turn into expensive messes. The difference usually comes down to planning. Not the glossy mood boards, the actual mechanical, electrical, and compliance groundwork that stops you getting stung halfway through.

Here’s what should be on your list before you touch a single ceiling tile.

Get Your Building Services Survey Done First

Before you start knocking walls or specifying new lighting, you need to know what you’re working with. Most commercial buildings in London, especially anything built before 2000, will have ageing M&E infrastructure that might not cope with modern office loads.

A proper building services survey covers your electrical distribution boards, existing lighting circuits, HVAC capacity, emergency lighting provision, and fire alarm zones. If you’re in one of the older office blocks around the City or Shoreditch, you might find original wiring from the 1970s still doing the heavy lifting. That’s fine until you add another 50 LED panels and a server room.

The survey should flag whether your incoming supply can handle the new load. Commercial units typically run on three-phase supplies, but older buildings sometimes have undersized main switches or distribution boards that are full. Upgrading these isn’t cheap, budget £3,000 to £8,000 depending on complexity, but finding out mid-refurb is worse.

Check your emergency lighting at this stage too. BS 5266 requires monthly function tests and annual full-duration tests. If the existing system is patchy or non-compliant, factor replacement into your costs now rather than discovering it during your pre-handover inspection.

Sort Your Landlord Approvals and Part L Compliance

Most commercial leases require landlord consent for alterations. That’s not just structural work, it includes new partitions, upgraded lighting, additional power circuits, even changing the fire alarm configuration. Submit your proposals early. Some managing agents take six weeks to respond, especially if the building’s owned by a pension fund with three layers of approval.

If you’re doing anything that affects the building fabric, new windows, additional insulation, upgraded HVAC, you’ll need to comply with Part L of the Building Regulations. For existing non-domestic buildings, that means meeting minimum U-values and efficiency standards. LED lighting upgrades usually sail through, but if you’re installing new air conditioning or replacing boilers, expect more scrutiny.

TrustMark registration helps here. We’re accredited, which means our electrical and mechanical work meets the government-endorsed quality standard. It’s not legally required for commercial jobs, but it smooths the approval process and gives building control more confidence.

Plan Your Electrical Infrastructure Properly

Modern offices use more power than you think. Every desk needs at least two double sockets, one for the computer, one for peripherals and phone chargers. Meeting rooms need display screens, video conferencing kit, and enough outlets that people aren’t crawling under tables with extension leads.

Work out your actual load requirements. A typical open-plan office draws around 25-30 watts per square metre for lighting, plus 100-150 watts per workstation for IT equipment. Add HVAC, kitchen appliances, server rooms, and you’re easily hitting 80-100 watts per square metre total. If your existing distribution board can’t supply that, you’ll need an upgrade.

Don’t forget data cabling. Cat6 is the current standard for network drops, though Cat6A is becoming more common if you’re future-proofing for 10-gigabit Ethernet. Run conduit to every desk position even if you’re not cabling it immediately, pulling cables through afterwards costs three times as much.

Fire Safety and Emergency Systems

Your fire alarm system needs updating if you’re changing the floor layout. New partitions create new fire zones. Relocating a kitchen or adding a comms room might require additional detection heads or manual call points. The system must comply with BS 5839-1, which sets out design, installation, and maintenance standards for commercial fire alarms.

Emergency lighting is non-negotiable. Every escape route, stairwell, and final exit needs maintained illuminance of at least 1 lux along the centre line. If you’re reconfiguring the space, your emergency lights need repositioning to match the new layout. We typically install self-contained LED emergency fittings, they’re easier to commission than central battery systems and cheaper to maintain.

Fire doors matter too. If you’re creating new meeting rooms or partitioning open-plan areas, check whether you need fire-rated doors and frames. Anything separating a protected escape route usually requires FD30 minimum. Your building control officer will pick this up, but it’s cheaper to get it right first time than rip out and replace.

Testing, Certification, and Handover

Before you move the desks back in, you need proper test certificates for all new electrical work. That means an Electrical Installation Certificate (EIC) for new circuits, plus a schedule of test results showing insulation resistance, earth fault loop impedance, and RCD trip times. We’re NICEIC-approved contractors, so our certificates are recognised by insurers and building control without question.

You’ll also need an updated Emergency Lighting Certificate showing the new layout complies with BS 5266. This includes a full-duration test, running the system on battery for the full three hours to prove it works. Do this before handover, not after you’ve filled the office with staff.

If you’ve upgraded or extended the fire alarm, expect a commissioning certificate from a competent person. The system needs functional testing across all zones, plus verification that it’s linked to any building-wide systems or monitoring stations.

Don’t skip the EICR (Electrical Installation Condition Report) if the building’s existing installation is more than five years old. Commercial properties should have an EICR every five years minimum, more frequently for high-risk environments. It’s not just good practice, many insurers won’t cover electrical faults without a valid certificate.

Practical Considerations for London Office Refurbs

Access and logistics matter more than you’d think. If you’re in a multi-tenancy building in Canary Wharf or the City, you’ll have strict working hours, usually 6pm to 8am on weekdays, weekends by arrangement. Loading bays get booked weeks in advance. Goods lifts are shared. Plan your deliveries carefully or you’ll have sparkies standing around waiting for cable reels that are stuck in the loading dock.

Parking in central London is a nightmare. If we’re working in EC1 or WC2, our vans are getting ticketed or moved on unless you’ve arranged permits or loading bays. Factor this into your programme, jobs in Zone 1 take 15-20% longer than equivalent work in Romford or Brentwood purely because of access constraints.

Noise is another issue. Drilling concrete for new conduit runs or fixing cable tray in a shared building means coordinating with neighbouring tenants. Some managing agents require acoustic barriers or restrict noisy work to weekends. Budget for this if you’re in a prestige office block where the tenants above and below are still trading.

What It Actually Costs

Electrical and mechanical work typically accounts for 20-30% of your total refurbishment budget. For a 200 square metre office in East London, you’re looking at £15,000 to £25,000 for a decent M&E package, new lighting, power distribution, data cabling, emergency lighting, and fire alarm updates.

That assumes your incoming supply is adequate and you’re not ripping everything back to the risers. If you need a new distribution board, three-phase supply upgrades, or you’re adding significant load (server room, commercial kitchen, EV chargers), add another £8,000 to £15,000.

Testing and certification is usually included in our quotes, but if you’re using multiple contractors, make sure someone’s responsible for the final paperwork. Chasing down certificates from three different subcontractors after handover is a miserable experience.

Bottom line: Office refurbishments go sideways when people treat the M&E work as an afterthought. Get your building services survey done early, plan your electrical capacity properly, and make sure every new circuit and system gets tested and certified before handover. The checklist isn’t glamorous, but it’s what separates a smooth fit-out from a expensive mess that fails building control and leaves you arguing with the landlord six months later.