Home > Resources


For over 25 years, Cornerstone has worked with subcontractors as our partners in the field of commercial construction. We value the time and expertise subcontractors bring to the project team by paying invoices promptly and insisting on safe, well-organized job sites that strictly adhere to schedules.

Helpful Documents

If you cannot open a PDF or are not running Adobe Acrobat, Adobe Acrobat Reader is available free for download.

pdf-logo.pngJobsite Safety Policy 
The personal safety and health of all people working on Cornerstone’s jobsites is of primary importance. The prevention of occupationally induced injuries and illnesses is of such consequence that it will be given precedence over operating productivity whenever necessary. We expect every person who conducts the affairs of our company, no matter in what capacity they function or at whose behest, to accept this concern and its responsibility.

pdf-logo.png  Certificate of Insurance (Sample)
Cornerstone must have a current Certificate of Insurance on file for both your General Liability and Workers Compensation policies.

pdf-logo.png  Form W-9
Is this your first time working with Cornerstone? Has the name of your business changed? This form is a one-time requirement and prerequisite for invoice payment.  Please email your completed W-9 to our Bookkeeper, Jen Martins.

Frequently Asked Questions

How do I get on future bid lists?
Visit our Contact Us page and use the online form to send us the complete contact information for your company’s estimator including his/her first and last name, title, company name, phone number(s), fax number, email address, and mailing address. Briefly describe the scope of services your company provides and the state(s) or region(s) that you work in.

What is the status of my bid?
Please email or call the project manager that sent the original bid request.

What is the process for getting a change order approved?
Requests for change orders should be submitted in writing directly to the project manager on your job (prior to invoicing).

I emailed my invoice to the Project Manager last month. Why haven’t I been paid yet?
The directions for submitting invoices, certificates of insurance, and lien waivers are detailed in the Subcontractor Invoicing Checklist. Sending these documents only to the project manager may delay your payment. Similarly, invoices received with missing, incomplete, or incorrect supporting documentation, as well as invoices that include unapproved change orders, will stop the “30 Day Clock” until all issues are resolved.

New England’s Premier Builder of Restaurants & Retail Stores