Hey Carly, it's all in the contract. You can not do work that is not approved by the property owner, that's as simple as it gets. If a change order occurred wherein the job was going to cost more; that needs to go to the property owner for approval unless your contract with the property manager states they can approve jobs in such a way. We won't even add $50 worth of work to a $10,000 job when we're doing the work without written approval from the property owner.
If I were in your shoes, I would get a better contract or review your current contract and see what is covered and what is not covered and require your property management company to require contracts for ALL work done to your property. I am pasting some sections from my contract that we use and provide our clients in NY for work to be completed. We are general contractors and property managers in the Syracuse, NY area.
Your property manager MUST require all contractors to sign a lien waiver as well, because in this case you could still get hit with a mechanics lien if you refuse to pay, and I would refuse to pay or attempt to mediate the amount.
Specifications & Permits
The project shall be completed according to any estimates, drawings, or specifications contained in this contract or delivered previously to “Owner” which have been examined by Owner and which may have been signed by both parties to this contract. Unless otherwise specifically stated or provided, Universal Property Management will obtain and pay for all required building permits and Owner will pay assessments and charges required by public bodies and utilities for financing or repairing the cost of sewers, storm drains, water service, and other utilities including charges for sewer and storm drain reimbursement, revolving funds, hookup, and other similar charges.
Owner will locate and point out the property lines to Contractor, and will engage a licensed land surveyor to provide boundary stakes if Owner is in doubt as to property boundaries. Owner assumes all responsibility for the accuracy of the boundary markers. Owner shall give copies of any restrictions, easements, or rights of way to Contractor before work is commenced. Unless otherwise specified, work does not include any changes or alterations from the drawings or specifications that may be required by any public body, utility, or inspector.
Contractor, at Contractor's option, may alter specifications only so as to comply with requirements of governmental agencies having jurisdiction over same. The cost of any alteration undertaken to comply with any such requirements shall be in addition to the Contract price specified herein.
Change Orders, Amendments, and Modifications
Any subsequent amendment, modification, or Contract, which alters this Contract, and which is signed or initialed by Contractor and Owner, shall be deemed a part of this Contract and shall be controlling in case of conflict with any other provision in Contract.
Extra Work and Changes
If Owner, Construction Lender, or any public body or inspector directs any modification or addition to the work covered by this Contract, the charge for that extra work shall be determined in advance and the cost shall be added to the Contract price in addition to Contractor's usual fee for overhead and profit. Owner shall make payments for all extra work as that work progresses, concurrently with regularly scheduled payments. Contractor shall do no extra work without the prior written authorization of the Owner.
Any authorization for extra work shall show the agreed terms and shall be approved and signed by both parties. Should any party, body, entity, or inspector require additional work to be completed or different materials to be used after this contract has been signed, it shall be considered extra work and Owner and Universal Property Management shall agree upon a price to complete per the specifications outlined by the former.