Why Is My Sourdough Dense? The Most Common Causes and How to Fix Them

Dense, heavy sourdough is one of the most common frustrations for home bakers. The good news is that it's almost always caused by one of a handful of identifiable problems, each with a clear fix. This guide works through the main causes in order of how often they occur.

1. The Starter Wasn't Active Enough

This is the most common cause of dense bread, and the most fixable. If your starter wasn't at peak activity when you used it, the dough won't ferment properly and the bread won't have enough gas to open up.

Signs: The loaf didn't rise much in the oven. The crumb is uniform and tight, without any irregular holes.

Fix: Only bake with a starter that has risen clearly after feeding — ideally within 1–2 hours of peak. If your starter doesn't reliably double within 8 hours at room temperature, spend a few days feeding it consistently before using it. See our guides on reading your starter and starter maintenance.

2. Under-Fermented Dough (Bulk Fermentation Too Short)

Bulk fermentation is the long rest period after mixing and before shaping. If this is cut short, the dough doesn't develop enough gas and flavour, and the bread bakes dense.

Signs: The dough doesn't feel noticeably lighter or more aerated at the end of bulk fermentation. When you cut into the baked loaf, the crumb is tight all the way through.

Fix: The dough should increase in volume by 50–75% and feel airy and bubbly during bulk fermentation. This takes 4–6 hours at 22°C, or longer if your kitchen is cool. Don't go by time alone — go by feel and visual cues. Temperature is the key variable.

3. Too Much Flour During Shaping

Adding too much flour when shaping creates a dry skin on the outside of the dough that prevents oven spring. The outside sets before the inside has a chance to expand.

Fix: Use as little flour as possible during shaping. A light dusting of rice flour on the banneton is sufficient. When pre-shaping and shaping, use slightly wet hands or a bench scraper rather than heavy flouring. Our bench scraper is ideal for shaping without adding excess flour.

4. Over-Proofed Dough

Paradoxically, letting the dough proof too long can also produce dense bread. Over-proofed dough has exhausted its gas-producing capacity and the gluten structure weakens. It bakes flat rather than springing up in the oven.

Signs: The shaped dough feels very soft and slack, almost jiggly. When you score it, it doesn't spring back — it just sits there. In the oven, it spreads sideways rather than rising upward.

Fix: For cold proofing in the fridge overnight (recommended), 8–14 hours is usually right. Don't leave it longer than 16–18 hours. The poke test helps: poke the dough with a floured finger. It should spring back slowly but not all the way. If it springs back instantly, it needs more time. If it doesn't spring back at all, it's over-proofed.

5. Wrong Flour

Low-protein flour doesn't develop enough gluten to trap the gas produced by fermentation. Plain flour (around 9–10% protein) is not suitable for sourdough bread — it won't build the gluten network needed for an open crumb.

Fix: Use baker's (bread) flour with at least 11–12% protein. Laucke Wallaby is a reliable Australian option available at Coles and Woolworths. Our flour guide covers the best options in detail.

6. Baking Temperature Too Low

Sourdough needs intense initial heat to create oven spring — the rapid rise in the first 15–20 minutes of baking when the gas expands before the crust sets. If the oven isn't hot enough, the crust sets too slowly and the loaf can't expand.

Fix: Preheat to at least 230–250°C. If using a Dutch oven, preheat it inside the oven for at least 30 minutes before loading the dough. Bake covered for the first 20 minutes, then uncover for the remaining 20–25 minutes. This is fully detailed in our Classic Sourdough Bread recipe.

7. Poor Shaping — Not Enough Surface Tension

Shaping creates surface tension in the dough that helps it hold its structure and rise upward rather than spreading out. Poorly shaped dough spreads rather than rises, giving a dense, flat result.

Fix: When shaping, drag the dough toward you on an unfloured surface to build tension. The skin of the dough should feel tight and smooth. After placing in the banneton, it should hold its shape when you lift the basket.

8. The Dough Was Too Cold Going Into the Oven

If baking straight from the fridge after cold proofing, the dough needs to be cold but not frozen. An extremely cold loaf can have less oven spring.

Fix: Bake straight from the fridge — don't let it warm up first. The cold/heat contrast actually helps oven spring. But make sure your Dutch oven is fully preheated before loading the cold dough.

A Note on Expectations

Sourdough bread is naturally denser than commercially yeasted bread. The irregular, open crumb of bakery-style sourdough takes time and practice to achieve consistently. If your bread tastes good but is a bit dense — that's still a win. Focus on one variable at a time and your results will improve with each bake.

For step-by-step guidance, our Classic Sourdough Bread recipe covers each stage in detail. And if you need a starter to bake with, browse our sourdough starter kits.