Master
Key Systems

City buildings accumulate cylinders. Fit-out teams leave construction keys live. A cleaner key opens more than the bins. A director copies a grand master at a kiosk on Bishopsgate. Then an emergency lockout becomes a building-wide recode because nobody knows which doors that lost key fitted.

A master key system is a chart: this person opens this set, that person opens a smaller set, and almost nobody opens everything. We survey, we argue with you about who should hold the grand master (few people), and we manufacture on a restricted profile so the kiosk cannot copy it.

This sits next to access control. Fobs handle the people who come and go. Keys handle plant, risers, and the Sunday override. Using only fobs is how you fail when the board dies. Using only keys is how you fail when staff turn over every quarter.

We walk the floor. Street door, inner suites, comms, cleaners, roof plant, bike store, waste. Each door gets a line. You mark who needs it. We stop you marking everyone on everything. Manufacture happens off site. Cutovers are often a weekend in empty towers around Moorgate and Liverpool Street, or a phased swap if you cannot close a dealing floor.

Heritage interiors around St Paul's and livery spaces need cylinders that fit existing furniture. New towers at Leadenhall can take a clean restricted profile throughout. Both can sit on one chart if the building is mixed, which many City addresses are.

Call 020 3371 1246 for a survey. CITY OF LONDON LOCKSMITH1 LTD, company 11001390, New London House, 6 London Street, EC3R 7AD. From-figures on prices; a full hierarchy is quoted after the door count, not before.

If your building is still on construction keys after practical completion, those keys still open the live cylinders. We kill that layer. If a previous locksmith left a pile of unstamped extras, we recode rather than trust the pile.

Lost grand master: treat it as an incident. Recode the layer it opens. Do not "wait and see". Combine with lock change on compromised doors the same week.

Many occupiers hold a City HQ and a satellite in Islington, Hackney or Southwark. The chart can span them if the profile is the same. The area pages still exist so each building has a local URL for search and for staff who only know the street.

Start from services or areas covered. For a lockout while the system is being planned, office lockout remains the same-day page.

Chart the doors. Every opening, who needs it, and who must never have it.

Cut the hierarchy. Sub-masters, housekeeper keys, and a tightly held grand master.

Stamp and issue. Cylinders stamped, keys counted, extras held or destroyed.

Hardware on the van for this job: restricted euro profiles; suite cylinders; construction-key systems; key cabinets.

Parts commonly fitted: restricted cylinders; stamped keys; key tags; cabinets.

Named standards: BS EN 1303, TS007, BS 3621. Timing bands: survey then manufacture; phased floor-by-floor swaps; weekend cutovers.

Failure modes we actually see: unlabelled jam-jar keys; everyone on the grand master; construction keys still live.

Street-level URLs exist so you do not land on a generic London page: Master key systems in Bank, Master key systems in Moorgate, Master key systems in Liverpool Street, Master key systems in Aldgate, Master key systems in Barbican, Master key systems in Fleet Street, Master key systems in St Paul's, Master key systems in Monument. The remaining City areas, boroughs and EC districts are linked from areas covered and from each neighbourhood page.

Related services: Commercial Locksmith, Lock Change and Repair, Office Lockout, Access Control and Door Entry.

Call 020 3371 1246. CITY OF LONDON LOCKSMITH1 LTD, company 11001390, New London House, 6 London Street, EC3R 7AD. From prices start at £180.

The method on this page is the same method we use on Bank, Moorgate, Liverpool Street, Aldgate, Barbican, Fleet Street, St Paul's, Monument, Cheapside, Blackfriars, Cannon Street, Tower Hill, Smithfield and Leadenhall. Neighbouring boroughs get the same bag and an honest clock. We do not swap in a suburban paragraph and change the place name. Hardware, failure modes, standards and timing bands above are the reason the sentences differ from a lock-change page or a safe-opening page.

If you are standing at the door now, the useful next step is the phone, not another scroll. If you are planning a floor of cylinders, send a door count and a photograph of one forend. If you lost a grand master, treat it as an incident and recode the layer it opened. If the opening is splintered, board it tonight and restore the lock to spec tomorrow if the frame can take it.

How many doors before a master system is worth it?

Even a dozen plant and riser doors benefit if more than two people need structured access. Street-door keyed alike is a smaller cousin of the same idea.

Can keys be copied at a high-street shop?

Not if we put you on a restricted profile with a card. That is the point.

How long from survey to cutover?

Depends on door count and whether cylinders are in stock in the chosen profile. We will not invent a 24-hour factory for a 200-door chart.

Can we keep existing furniture?

Usually. Cylinders change inside the existing escutcheons when lengths match.

What happens if a sub-master is lost?

We recode the group it opens, not necessarily the whole building. That is why the chart exists.

Do you provide a key cabinet?

Yes, as an option, with tags that match the chart rather than handwritten tape.

This Master Key Systems page exists so a search does not collapse into a generic London blob. restricted euro profiles Attendance is still from New London House, 6 London Street, EC3R 7AD, with lawful access checked before a pick enters the keyway.

Non-destructive entry stays the default here. suite cylinders Drilling is a named line you can refuse. Night and Sunday bands live on the prices page. Company number 11001390 sits on the invoice.

Call 020 3371 1246 if the door is in front of you. construction-key systems WhatsApp +44 7895 673226 accepts a forend photograph when the street is quiet enough. Maps and analytics wait for cookie consent. We do not invent star ratings.

Internal links from this URL reach services, neighbourhoods, prices, contact and about. key cabinets Neighbouring streets get their own pair pages rather than a copied paragraph with the place name swapped.

CITY OF LONDON LOCKSMITH1 LTD is the legal entity. unlabelled jam-jar keys The Square Mile empties at weekends; that changes walking distance from a legal bay, not the ID rule. Plant rooms often hold a cheaper cylinder than the street door, and we will say if it should be raised to the same grade.

This Master Key Systems page exists so a search does not collapse into a generic London blob. everyone on the grand master Attendance is still from New London House, 6 London Street, EC3R 7AD, with lawful access checked before a pick enters the keyway.

Non-destructive entry stays the default here. construction keys still live Drilling is a named line you can refuse. Night and Sunday bands live on the prices page. Company number 11001390 sits on the invoice.