Southside Construction Ltd is a Bournemouth-based building contractor specialising in home extensions, renovations, and residential construction projects across Dorset.
If you are looking to create more space without the cost and disruption of moving, a house extension can be a practical and long-term solution. Southside Construction Ltd provides professionally managed house extensions in Bournemouth, helping homeowners add space, improve layout, and increase property value.
From initial feasibility through to final finishes, we deliver well-planned extensions built around your home, lifestyle, and budget — with clear communication at every stage.




Our extension service covers the full construction process, allowing your project to progress smoothly from start to finish.
We manage trades, schedules, and inspections to keep your project organised and compliant.

Some house extensions in Bournemouth can be completed under permitted development, while others require planning permission depending on size, height, and proximity to boundaries.
Regardless of planning requirements, most extensions require Building Regulations approval, covering:
Many house extensions involve structural work, such as removing external walls or installing steel beams to create open-plan spaces. Where extensions affect shared walls or nearby boundaries, the Party Wall etc. Act may apply.
We identify these requirements early and explain the steps involved, helping you avoid delays once work begins.
Every project is different, but a typical house extension follows a clear sequence:
Timelines depend on extension size, complexity, and approval requirements.
Extension costs vary based on several factors, including:
We provide clear, itemised quotations so you understand where costs are allocated before work starts.
Our focus is on delivering extensions that integrate seamlessly with your existing home and stand the test of time.
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