I'll create a smart lock and doorbell installation cost calculator

I develop an interactive calculator for a company's website that installs smart locks and smart doorbell cameras. A customer enters the number of doors, selects the device type (lock, doorbell, or kit), marks whether smart home system integration is needed, and immediately gets an estimate for work including installation. This removes part of the load from managers who previously calculated prices manually over the phone or via messaging, and increases request conversion because the visitor sees the price right away, without waiting for a response.

I base the logic on your price list: number of installation points, installation complexity (ready opening, reinforced door, doorbell wiring), brand or device model selection, necessity of app setup and Wi-Fi or smart home hub connection. Each parameter can be changed after launch without a programmer — I'll put coefficients and prices in a separate panel or simple settings file. The calculator is responsive, works on phones and tablets, integrates into the existing website page without style conflicts.

What's included:
— analysis of your current price list and pricing logic;
— design of step-by-step form (doors, device, integration, installation);
— real-time cost calculation without page reload;
— responsive layout for mobile devices;
— panel or file for independent price and coefficient changes;
— request sending with calculation to email or CRM;
— testing on different scenarios and browsers;
— instructions on updating prices after project delivery.