Okay, If using a developer to build a site from scratch, this is a list of considerations that I have got so far.
Site Architecture
Use keyword rich breadcrumbs
Internal Link structure
- Page Depth
- Quantity of Internal Links
- Quality of Internal links
- Index Canonicalization
XML Sitemaps
Page Optimisation
- Page Titles
- Meta Descriptions
- H1 Tags
- URLS
- Duplicate Content
- Robots.txt
- HTTP Status Codes
- Image alt attricbutes
- Textual Content
Anything else?