As we stand on the cusp of a new era of pool building, innovative techniques, materials, and technologies are set to revolutionize the way we design, construct, and enjoy our swimming pools. The industry, as a dynamic one, is bound to experience a significant transformation in the coming years, fueled by new consumer demands, sustainability concerns, and technological advancements.

One cannot discuss the future of pool building without addressing the elephant in the room: sustainability. From an ecological perspective, the traditional methodologies of pool construction, maintenance, and usage have often proven to be rather resource-intensive. However, the zeitgeist of our era is increasingly oriented towards environmental consciousness, thereby pressuring the industry to adapt and innovate for sustainability.

One trend that has started to gain traction in response to this is the proliferation of natural swimming pools. These are pools that utilize biological processes to purify the water, obviating the need for chemical disinfectants. In a natural swimming pool, a regeneration zone, replete with plants and microorganisms, is employed to naturally detoxify and purify the water, akin to the ecological processes in a pond or lake. This proffers dual benefits: a reduction in chemical usage and a unique aesthetic appeal. However, it is important to note that the implementation and maintenance of such systems require specialized knowledge and skills, which could potentially drive up costs compared to traditional pools.

From a materials science perspective, the usage of advanced composites and polymers is expected to alter the construction landscape significantly. These materials, often characterized by superior strength-to-weight ratios and resistance to environmental degradation, can result in pools that are more durable, easier to maintain, and potentially more cost-effective in the long run. One example is the application of Carbon Fiber Reinforced Polymer (CFRP) in the formation of pool shells, a method that is starting to replace the conventionally used concrete or fiberglass. CFRP, despite being relatively lightweight, exhibits exceptional strength and durability, enabling the construction of thin yet robust pool shells. However, the trade-off for such benefits is the initial cost, with CFRP being significantly more expensive than traditional materials.

Technological advancements are also set to play a pivotal role in shaping the future of pool building. For instance, the integration of Artificial Intelligence (AI) and Internet of Things (IoT) in pool maintenance systems can facilitate real-time monitoring and adjustment of pool parameters (e.g., temperature, pH, chlorination levels), thereby improving efficiency and reducing manual labor. It's worth noting though that while these technologies have immense potential, they also introduce concerns related to data security and privacy, which need to be rigorously addressed.

Lastly, the design ethos of pools is poised for a shift, with a trend towards more holistic, multi-functional spaces. There is an increasing demand for pools that cater not just to swimming, but also to relaxation, fitness, and entertainment, which is expected to spur the design of innovative pool features. Examples include infinity edges for aesthetic appeal, inbuilt spas for relaxation, swim jets for fitness, and poolside bars for entertainment. However, these additional features would invariably increase the complexity and cost of construction.

In conclusion, the future of pool building is likely to be characterized by a delicate interplay of sustainability concerns, materials science innovations, technological advancements, and evolving consumer demands. Industry stakeholders and pool builders need to stay abreast of these trends and adapt their practices accordingly to stay competitive and relevant.

While it's difficult to predict with absolute certainty, the aforementioned trends do provide some indication of the trajectory of the industry. In light of these possible transformations, it's crucial for all stakeholders to be proactive in embracing change and innovation, in order to sculpt a future for pool building that is sustainable, efficient, and in line with consumer demands.