If you received a Renton RFA invoice that you would like to pay, your invoice number is required. If you do not know your invoice number, please call: (425) 276-9580. If you are trying to make a payment for a Systems Design West (SDW) invoice, that payment should be made directly through SDW. You can contact them at: 360-336-0420 or rentonfirepermits@sdwems.com.