Construction Quoting Spreadsheet

I need a specialized quoting spreadsheet for the construction industry. This tool will be essential for accurately estimating project costs and generating quotes.

Requirements:
- User-friendly interface
- Sections for materials, labor, and overhead costs
- Automatic calculations for totals and subtotals
- Ability to add, modify, and remove line items
- Secure data protection and backup
- Ability to adjust margin and markup on supplied materials
- Ability to select materials from drop down boxes
-Ability to select cable and cable lengths based on material cost and desired margin
-Ability to input labour allowance and automatically total the amount of labour in the quote
-Ability to auto generate a list of materials required to be ordered from wholesaler, total margin in the job, total labour in job, total tax payable for job,
-Ability to easily add materials and keep pricing updated as price increases are incurred.
-Ability to have different heading (example: Lighting; with drop down box options to select what's required, Power; with drop down box options to select what's required, Coaxial; with drop down box options to select what's required, Data; with drop down box options to select what's required)


Ideal Skills and Experience:
- Proficiency in Excel or Google Sheets
- Experience creating financial or quoting spreadsheets
- Attention to detail and accuracy
- Background in construction is a plus