Garden Annexes
Design & Build
Celtic Mini
Celtic
Celtic Plus
Garden Annexes Designed for Independent Living
Garden annexes provide a practical way to extend living space without extending your main home. At Celtio, our range of modular garden annexes has been developed to deliver fully self-contained accommodation built to residential standards while remaining compliant with Caravan Act dimensional requirements. This approach allows many installations to proceed without the complexity of full planning permission, offering a structured and legally informed pathway to creating additional living space within your own garden.
10 Year Warranty
BS 3632:2023 Compliant
Predictable Scope
Energy Efficient
Minimal Site Disruption
About our Garden
Annexes
Each model in our garden annexe collection is engineered for year-round comfort. Built using high-performance timber construction systems and precision off-site manufacturing, our annexes provide excellent thermal performance, structural stability, and long-term durability. Walls, floors, and roof assemblies are designed to support energy efficiency and internal climate consistency, ensuring interiors remain warm in winter and comfortable in summer. The result is a space that feels permanent, solid, and refined, rather than temporary or lightweight.
Our product range includes multiple layouts designed to accommodate different living needs. Compact one-bedroom configurations offer efficient independent space for elderly relatives or adult children seeking privacy while remaining close to family. Larger two-bedroom options provide greater flexibility for multigenerational households, live-in carers, or dual-purpose use such as combining living accommodation with a home office. Each layout is carefully structured to optimise internal flow, natural light, and practical storage without exceeding regulatory size limits.
Beyond layout flexibility, our annexes are built with sustainability and material performance in mind. Sustainable timber construction reduces embodied carbon compared to traditional building methods while maintaining structural integrity. Off-site fabrication improves quality control and reduces material waste, allowing each annexe to be manufactured with precision before delivery to site. This controlled process shortens installation time and limits disruption to the main property.
Every garden annexe within our range is developed to meet clear compliance criteria. By adhering to Caravan Act dimensions and mobility requirements, our structures are legally classified as caravans where applicable, simplifying the approval process. At the same time, construction methods align with residential performance expectations, ensuring long-term usability and structural resilience. This balance between regulatory compliance and residential-grade performance defines the technical foundation of our offering.
Speak to us
If you would like to discuss your project, request specifications, or explore suitable configurations, our team is ready to assist. Get in touch to arrange a consultation and take the next step toward modular living built around your requirements.