Construction & Demolition

Locations in our Construction, Deconstruction, and Demolition Recycling Guide are open but might have modified hours and procedures.  If you have any questions, you can email us at or call 888-442-2666.

Construction & Demolition (C&D) waste can be generated as a result of new construction, remodel, or demolition projects. In order to reduce as much C&D waste as possible, the County requires that certain projects in unincorporated San Mateo County that generate such waste file a Waste Management Plan with the Office of Sustainability.


A Waste Management Plan is necessary to demonstrate compliance with County regulations that require covered projects to salvage, reuse, or recycle all inert solids and at least 65% of all of the construction and demolition debris generated by the project.

A Waste Management Plan is required if your project consists of one or more of the following:

  • Demolition work only as determined by the Building Official or designee
  • The renovation, remodel or addition to an existing structure that increases the building’s conditioned area, volume, or size as determined by the Building Official or designee
  • The construction of a new permitted structure as determined by the Building Official or designee



The County has an online system for processing your Waste Management Plan. Using this online system, you may now submit and obtain approval of your Waste Management Plan, submit all supporting documentation, and track the information and documents that you submit, all from the convenience of your home or office, 24 hours a day. To access the online system, the person who applied for the permit got an email from Green Halo with instructions. Please email or call 888-442-2666 to have the project assigned to someone different.  If you are a first time user, you will need to register to utilize this online system.

Section One: Permit Application

  • After you register, go to, log in, and click on the green number in Waste Management Plans in Progress.
  • Click start here, enter your information with your best estimates of the debris including mixed C&D (mixed construction and demolition debris) that will be generated and how it will be reused or recycled in compliance with the County’s Building Regulations, and click submit for approval.
  • Once you submit your project for approval, staff will be notified and review it.
  • Staff will approve it or ask you questions. Staff may have additional recommendations that accompany the approval of your plan, and may request receipts to be submitted during the project.
  • You will then get an email from Green Halo saying whether you project was approved or rejected.
  • All pictures and receipts relating to recycling and disposal that are generated throughout your project must be saved and turned in at the end for your final inspection.

Section Two: Final Report Approval

  • When your project is completed, you will upload your receipts to your project and click submit for final.
  • Section Two, along with all recycling and disposal receipts or equivalent documentation must be submitted and approved by Office of Sustainability staff before we issue your Final Project Approval.
  • Once you submit your project for final, staff will review and approve it or ask you questions.
  • You will then get an email saying whether you project was approved or rejected.
  • Projects whose Waste Management Plans are found not in compliance with County’s Building Regulations may be subject to a fine up to $1,000.

Call 888-442-2666 or email for assistance.


There is a $95 administrative fee that is added electronically by the Office of Sustainability when you file your Section One of the Waste Management Plan. The County’s Building Department collects this fee before you get your permit.

If your project is required to comply with the Building Regulations and you fail to turn in copies of receipts or equivalent documentation as requested, submit an inaccurate or incomplete final Waste Management Plan, or submit a Waste Management Plan that does not show compliance with the Building Regulations, a stop order may be issued on the job, your final approval may be delayed, you may be requested to provide additional information, and in some cases, may be fined up to $1,000.

Helpful Documents:


Deconstruction is a cost-effective and environmentally responsible alternative to conventional building demolition, where hazardous materials are removed, reusable appliances, flooring, and other building materials are salvaged and non-reusable materials are recycled.

Deconstruction Trainings

The County of San Mateo Office of Sustainability (OOS) has contracted with The ReUse Institute to offer deconstruction trainings to teach people how to deconstruct buildings and save valuable materials from being landfilled, ground up into mulch, or used as biofuel.

2021 Deconstruction Job Training Course

If you would like to be put on a list to be notified of the next training, please email

Consider deconstruction over demolition!  The OOS is offering to deconstruct your house and will pay for the training, meaning you will not have to pay for the labor to deconstruct.  In addition, you may also receive a tax-deductible donation for the materials salvaged from your project.  For more information and to apply, please view the Deconstruction Application.

Past Trainings

Deconstruction Job Training
Benefits of Deconstruction Training