Cost + timeline for migration to Magento from Shopify (fashion specific)?

Realistic ranges for a fashion brand at $2M, $10M GMV:

• Magento + Hyvä rebuild: $25k, $70k. Fashion-specific scope adds: configurator setup ($4k, $8k), drop-release flow ($3k, $6k), returns automation integration ($3k, $5k), AR partner integration ($2k, $4k), B2B layer if needed (+$8k, $25k), PIM/channel-manager integration if needed (+$8k, $20k).
• Timeline: 8-14 weeks for a typical mid-market fashion store. Faster (6 weeks) if SKU count is small and design is preserved; longer (16-24 weeks) for B2B + multi-region in scope.
• Hosting: $400, $1,500/mo on Cloudways / dedicated. Fashion needs over-provisioned for drop traffic spikes, assume 5-10x base traffic during a drop. CDN (Cloudflare / Akamai) mandatory.
• Ongoing: $1.5k, $5k/mo retainer for through-season ops (drops, post-launch returns iteration, AR rollouts).

Risks specific to fashion migration:

• Variant-product mapping is fiddly, Shopify treats “Size: M, Color: Blue” as one option pair; Magento separates size and color into independent attributes. Migration script needs to flatten + reshape.
• Return history and store-credit balances must migrate cleanly, otherwise customers lose visible credit and complain.
• SEO: redirects must cover product URLs (Shopify /products/<handle> → Magento /<url-key>.html) AND category URLs AND variant deep-links. Miss any of these and you drop 20-40% of organic for ~6 weeks.

Run both stores parallel for 30 days behind a feature flag, only flip DNS once redirects map ≥98% of traffic + 30 successful test orders + 1 dry-run drop. Fashion migrations done well don’t lose ranking; done badly they take a season to recover.