Landlord's contacts.

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We want to ensure that it’s easy for you to contact us whenever you need to. Please find below key contact information:

Please ensure you have all your relevant documentation to hand before you make contact.


Day-to-day queries

For any estates or property administration queries, please contact our Estates Service department, managed by our partner, Cluttons.

0800 084 3454 (Option 2) (Monday - Friday 9:00am - 5:00pm)


Cornerstone Estates, c/o Cluttons LLP, First Floor,
Imperium Building, Imperial Way, Reading, RG2 0TD

Whenever you contact us, please make sure you always quote:

  • Your unique Cornerstone Cell Site reference
  • Your Site Address

Emergency contact

At Cornerstone, we must respond promptly to issues and incidents concerning our sites and your property. Cornerstone has a 24-hour service desk which you can call should you have an issue regarding the telecoms equipment.

On calling, please choose option 1, and you will connect to our partnering service Mitie. Please provide the operator with as much detail as possible.

Cornerstone operates a business continuity management system compliant with ISO 22301 and assessed by BSI. If a major event or issue is raised, Cornerstone will inform its Incident Management Team, led by our Chief Financial Officer. They will bring the situation under control and back to a satisfactory state.

0800 084 3454 (Choose option 1)



Report Site Issues

To report site issue click here: Report Site Issues


Payment queries

If you receive a payment in error, haven’t received a payment, or have a question about a payment that is due or you have received, please contact the Cornerstone Estates Service Desk.

0800 084 3454 (Choose option 3)



Are you VAT registered?

We’d like to remind our landlords that if you are a VAT registered company and you have elected the site for VAT, it is important to comply with your HMRC legal obligations by sending us a VAT invoice quoting your registration number, in support of your rent payment. Without a valid VAT invoice, we are unable to pay you the related VAT that is due.

Invoices should be sent to:


Cornerstone Head Office

If you want to contact Cornerstone directly out Head Office address is:

Hive 2, 1530 Arlington Business Park, Theale, Berkshire. RG7 4SA.

Contact us

Hive 2
1530 Arlington Business Park
Contact Cornerstone

Site Reporting

To report a site issue click here.

London Site Audit

To request site access or cancel a visit click here.