Imagine buying a property at 10am and selling it at 2pm the same day, never owning it overnight, never taking a mortgage on it, and banking the difference. That is a back to back — the most capital-efficient exit in property and, simultaneously, the one where the legal execution decides everything. This guide explains the mechanism, the money, and why your choice of solicitor matters more than your choice of property.
You secure a property below market value, and instead of completing and reselling later, you exchange and complete your purchase and your onward sale simultaneously — commonly by assigning your contract to the end buyer via a deed of assignment, or through a same-day double completion. Your end buyer’s money funds the chain; the difference between your locked purchase price and their price is your profit, released by the solicitor on the day. Done correctly through solicitors experienced in the structure, it is entirely legal and long established.
Jargon check — deed of assignment and simultaneous exchange. A deed of assignment transfers your rights under the purchase contract to your end buyer — they step into your shoes and complete directly with the seller, paying you the difference. A simultaneous (back to back) exchange is the alternative: two transactions, A-to-B and B-to-C, exchanging and completing on the same day. Which structure fits depends on the deal, the lender (if any), and the solicitors — and transparency with all parties is what keeps it clean.
Illustrative figures, not a live deal. The margin resembles a flip — without the refurb, the holding costs, or the six months. The trade is that everything must land on the same day: seller ready, buyer funded, both solicitors aligned. When one leg wobbles, the whole structure waits.
No capital tied up. The end buyer’s funds complete the chain. Your money is in the deal for hours, not months — sometimes never.
No ownership window. No mortgage, no insurance, no tenants, no holding risk. You are a principal for one day on paper and zero days in practice.
Flip-grade margins at deal-fee speed. Five-figure results in the time a normal purchase takes to reach exchange.
The honest risks. Execution risk is the whole game: if your end buyer withdraws or their funds fail late, you either complete yourself — needing bridging finance you may not have arranged — or the deal collapses and the seller walks. Mortgage lenders dislike sub-six-month ownership and assignments; cash or specialist-financed end buyers are the realistic market. The structure demands solicitors genuinely experienced in it — a conveyancer who has never run one will kill the timeline. Transparency matters legally: all parties understanding the structure is what separates a legitimate back to back from a problem. And your margin is only as real as your end buyer’s commitment — deposits and exclusivity agreements exist for a reason. Take independent legal advice on every deal, without exception.
Investors and traders with strong buyer networks who want flip margins without flip capital or timescales — and the temperament to handle a deal where three parties must perform on one day. If you would rather hold the asset and earn from it, this is not your strategy; read the BTL and BRRR guides instead. It pairs naturally with the Assisted Sale JV: same buyer network, different legal engine.
These deals begin with a deep discount — without it there is no spread to trade. We secure the property at a genuinely below-market price, evidence the value with sold comparables, and structure through solicitors who run back to backs routinely and can recommend the right vehicle for the specific deal. The pack shows the locked price, the comps, the realistic end-buyer price, and the projected margin after costs — the whole trade on one page before you commit.
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