Unlocking Hidden Housing Potential
Many new homes are needed in the Netherlands. Yet production is stalling. What opportunities does the existing stock offer for adding new homes? Commissioned by WoningBouwersNL, Pop-Up City and Republiq investigated the potential of splitting, topping up and adding on.
Space in, on and to Existing Buildings
With creativity and innovative building methods, the existing housing stock can play a key role in solving the housing crisis. By splitting houses, adding new layers (topping up) or smart additions, thousands of homes can be created. This approach not only adds to the housing stock, but also enhances the liveability of neighbourhoods through social diversity and sustainable developments.
We analysed data on the entire Dutch housing stock, examined practical examples and uncovered opportunities as well as obstacles
What Is the True Potential?
Our research provides insight into the feasibility and impact of these strategies. We analysed data on the Dutch entire housing stock, examined practical examples and uncovered opportunities as well as obstacles. Although the potential is significant — an estimated 180,000—260,000 additional homes through splitting and topping up — restrictive regulations, technical challenges, and resident opposition limit large-scale implementation. Accounting for these barriers, we estimate the current potential at 37,000—70,000 homes, far below earlier studies focused solely on technical feasibility. These conclusions were confirmed by the builders themselves. Our research not only outlines a realistic vision, but also offers concrete recommendations for house builders, governments and owners to increase future opportunities for splitting, topping up and adding on.
