A bet builder (sometimes called a Same Game Multi or SGM) is a feature offered by most major bookmakers that allows you to combine multiple betting markets from a single match into one bet. Rather than betting on a team to win, then separately betting on the first goalscorer, you combine both — and any other markets you like — into one wager with combined odds.
The appeal is the potential for large payouts from a single match. You might combine: Manchester City to win + Erling Haaland to score anytime + over 3.5 goals. Each selection multiplies the odds, and a £10 stake on combined odds of 8.0 returns £80. This is the same multiplication principle as an accumulator, applied within one fixture.
The significant drawback is correlation pricing. In a normal accumulator across different matches, the legs are independent. In a bet builder, the selections are often highly correlated — if City win 4-0, Haaland probably scored and there were over 3.5 goals. Bookmakers know this and intentionally set combined odds lower than the raw multiplication would suggest to account for the positive correlation.
Value in bet builders is hard to find because of the correlation discount. Use them as entertainment products rather than a core betting strategy. The best use cases are markets that are genuinely independent within the same match — for example, a player receiving a yellow card and the match result are weakly correlated, giving a more honest price.
Example
Liverpool vs Everton. You build: Liverpool to win (1.60) + Mohamed Salah first goalscorer (5.00) + over 2.5 goals (1.70). Raw multiplication gives 1.60 × 5.00 × 1.70 = 13.60. The bookmaker's bet builder prices it at 9.50, applying a correlation discount. A £10 stake returns £95 if all three legs land.