The cornerstone for the buildings we run.
Corestone was set up on a simple idea: facilities management should be invisible when it works, and answered by a human when it doesn't.
Who we are
We're a Sheffield-based facilities company working across Yorkshire and the North West. We employ our own engineers, cleaners and security officers rather than subcontracting, which is why the same people turn up every week and why we can promise response times we actually control.
We're an SIA Approved Contractor and hold SafeContractor and CHAS accreditation. Our helpdesk is staffed 24 hours a day, 365 days a year, from our Sheffield office.
- 2013founded
- 240directly employed staff
- 140+sites
- 3regional offices
How we'd like to be judged
Four things we say to every new client, and then have to live with.
Directly employed
Our engineers, cleaners and officers are on our payroll. Subcontracting the work means subcontracting the standard, and then the response time is somebody else's to keep.
Named, not routed
Every contract has a named manager with a direct line. Escalating should mean speaking to someone who can decide, not restating the problem to a queue.
Evidence over assurance
Scores, photographs, timestamps and certificates. If we say a standard was met, you should be able to check without asking us.
Say it early
A missed SLA, an overspend, a failed audit — you hear it from us in the monthly report, not from a tenant. Bad news does not improve with age.
How we got here
We have grown by adding services clients kept asking us to manage, rather than by buying our way into them.
- 2013
Founded in Sheffield
Started with two engineers and three buildings in South Yorkshire.
- 2016
Cleaning division
Added directly employed cleaning teams after clients kept asking us to manage their existing contractor.
- 2018
Leeds office
Opened a second base to serve West Yorkshire without stretching response times.
- 2021
SIA Approved Contractor
Brought security in-house and took the guarding operation through ACS assessment.
- 2023
Manchester office
Extended coverage across the North West.
- 2025
Client portal
Moved every job, certificate and audit score into a portal clients can see without asking.
Leadership
Named managers, direct lines. This is who answers when you escalate.
James Morley
Managing Director
Sarah Whitfield
Contracts Director
Rahim Khan
Head of Engineering
Laura Okafor
Head of Security
Where we work
Three offices, one helpdesk. We take on work where we can hold the response time we've promised — which is why we cover the North rather than claiming the country.
Sheffield
Head office & helpdesk
Leeds
Regional office
Manchester
Regional office
Want the detail on how a contract starts? See how we work.
About the business
How far do you travel?
We work across Yorkshire, the North West and the northern Midlands, from offices in Sheffield, Leeds and Manchester. Beyond that we would be relying on subcontractors to hit a four-hour response, and we would rather turn the work down than promise something we don't control.
How big does a contract need to be?
There is no minimum. Plenty of clients start with one building or one service. It is a better test of a supplier than a tender document is.
Do you work with managing agents?
Regularly. On multi-let estates and residential blocks we often sit behind the agent as the operational and compliance delivery team, with clearly defined responsibilities on both sides.
Who owns the business?
[To be confirmed by the client — ownership structure, group membership and company registration number belong here.]
Come and see how we work.
We'll happily show you a live site before you sign anything.