TWO WEBSITES, ONE SURVIVOR, NONE OF THE TRAFFIC LOST.

Why merging websites is the riskiest migration type.

A website merger (also called a consolidation migration) combines two or more websites into a single site, usually after an acquisition, a brand merger, or a rebrand. It carries every risk of a normal migration, twice, plus two risks that only exist when sites combine: keyword overlap and a destination that may be brand new.

A standard replatform moves one set of rankings to one new home. A consolidation takes two sets of rankings, two backlink profiles, and two streams of leads, and forces a decision about every overlap. Most consolidation damage comes from those decisions being made implicitly, by whoever builds the redirect map last, instead of deliberately, by someone looking at revenue data.

And when the destination is a brand-new domain, the stakes rise again: Google evaluates the new domain from scratch. The equity of both old sites transfers only as well as the redirect and linking work carries it.

The first decision: which domain survives?

Every consolidation starts with a decision most teams make on brand feelings alone. It deserves data:

There is no universally right column. There is only a right decision made with the numbers on the table: domain authority, the non-branded rankings that produce leads on each site, and how much of each site's traffic is navigational brand traffic that will follow the company anyway.

The consolidation playbook.

The sequencing principle that governs everything: consolidation happens only after the destination site is demonstrably ready. Not launched and patched. Ready, and provably so. In practice:

1. Baseline both sites separately.

Traffic, conversions by type, priority pages, focus keywords, branded versus non-branded click share, and backlink profiles, per site. This is where the merger-specific insight usually appears: how much of each site's traffic is brand-navigational (it follows the company wherever it goes) versus contestable non-branded demand (it has to be defended page by page).

2. Resolve every keyword overlap before mapping redirects.

For each keyword where both sites have visibility: one winning URL on the new site, one redirect from the loser. This list drives the content plan for the combined site, not the other way around.

3. Build two backlink-weighted redirect maps.

One per retiring domain, each mapping page-to-page onto the survivor. The URLs holding the strongest backlinks get matched to live, relevant destinations first. A homepage catch-all redirect is how consolidations quietly bleed years of link equity.

4. Make the destination real before cutover.

An indexable base, verified in Search Console with a sitemap. Three to five theme pages live early, built where the two sites' demand, conversions, and AI citations already cluster. Contextual page-to-page links from the strongest pages of both old sites to their new equivalents, so Google already knows the new URLs when the redirects flip.

5. Cut over in stages, then monitor like it is week one. Because it is.

Redirects flip per domain, not necessarily on the same day. Then the standard cadence: 48-hour check, 1-week, 1-month, and 6 to 8-week reviews against both baselines, reading conversions and priority pages, not total traffic. Total traffic is misleading in a merger, because navigational traffic from two brands is reshuffling at the same time as the organic signal you actually need to protect.

I am running exactly this playbook right now: two established lead-generating websites consolidating into one brand-new domain, with the pre-launch linking and staged cutover above. It is also the scenario behind one of my delivered migrations, a merger where the fear was losing the pages that produced the leads. Leads grew through launch week instead.