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Merging two healthy sites with substantial traffic is a decision that requires a lot of analysis.  In my opinion, "How to do it?" is a less important question than "If I should do it?".  It can often be much more profitable to have two sites in the SERPs than one site in the SERPs.  Each of these sites can be pulling in the sales, they can operate on different value propositions and their competition with one another can displace competitors.   It might be hard on the egos of company directors to buy a competitor and then "run their site"... but that can be the more profitable decision. The "How to merge them?" and "If to merge them?" analysis  should consider many things... --  traffic overlap --  product overlap --  backlink overlap --  content overlap --  keyword overlap It could be possible to merge two sites with 100% overlap of the above and make very little gain in the resulting site  --  yet loose all of the benefit of the site that was merged.  So be careful here.  Do deep analysis.  Map out the opportunity of gain before blindly redirecting.  Don't squander one site thinking that the merger is going to be a bonanza. Also keep in mind that DA is more logarithmic than linear.  You might merge a DA 60 site with a DA 50 site and that will only move your DA 60 up to a DA 61 or 62.   No kidding.