The ideal format for an interior design questionnaire for clients is digital. To make it super easy and convenient for them, use the questionnaire feature of your interior design software, like DesignFiles. This way, clients can sign your contract, pay your invoice, and fill out your questionnaire all within one portal branded to your business. And, when it comes time to share your design, you can use the same platform to collect their feedback, review product approvals, and place orders. If you’re not using an all-in-one platform like DesignFiles to manage client work, you could send your questionnaire using a free survey tool like Google Forms or Typeform.