Linking Extensions with Other Buildings

Why Link Buildings Together

When you build an extension that sits separately from your main house, or when you have two outbuildings that would work better as one space, you may want to create a physical link between them. This commonly involves connecting a detached extension back to the house, though similar approaches can work when joining other buildings on your property, subject to their specific structural and regulatory requirements.

The reasons for linking buildings vary. Some people want a visual connection that makes the extension feel like part of the home rather than an isolated structure in the garden. Others want practical shelter so they can move between buildings without getting wet. A few want a fully enclosed, weatherproof corridor that functions as additional usable space.

What you want to achieve will influence your choice of materials and whether you need formal permissions.

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Types of Link Structure

The simplest option is a pergola or open framework over an existing path. This gives a sense of connection and can support climbing plants, but offers little weather protection. Pergolas work well when the visual link matters more than staying dry.

A covered walkway with a roof but open sides provides shelter from rain while keeping the structure light and airy. This suits gardens where you want to maintain views and avoid blocking light. The roof might be solid tiles to match your house, or something lighter like polycarbonate or glass.

A fully enclosed link creates a proper corridor between buildings. This can be heated and used year round, making it the most practical choice if you need to move between spaces frequently. Glass or glazed panels are popular because they let light through to the garden on either side.

The style and materials you choose should complement both the house and the extension. A glass link can work well between traditional brick buildings because it reads as a modern intervention rather than a poor imitation of the original architecture. Matching brick or render may suit situations where you want the link to blend in completely. Consider sustainable materials and energy efficient glazing, which can reduce long term running costs and environmental impact.

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Planning Permission and Building Regulations

Whether you need planning permission depends on the size and nature of the structure. Open pergolas and simple covered walkways may fall within permitted development rights, but this is not guaranteed. Factors including height, proximity to boundaries, listed building status and whether the property sits in a conservation area can all affect the position. Always verify with your local planning authority before assuming permitted development applies.

Building regulations are a separate matter. Enclosed structures will usually need to meet building regulations for structural safety, insulation, ventilation and fire safety, whether or not they form part of habitable space. Even a simple covered link might need approval if it affects drainage or the structural integrity of the buildings it connects.

Fire safety requirements apply to all building work, not just structures that create new escape routes. Adequate means of escape must be maintained, and the link must not compromise the fire safety of either building.

The rules depend on your specific circumstances. Contact your local council's planning department early to check what applies. The Planning Portal website provides general guidance on permitted development and when applications are required. For building regulations queries, your local authority building control team or an approved inspector can advise on current requirements.

Practical Considerations

Think about how the link will affect your garden. A solid corridor down one side may cut the space in two, making the garden feel smaller. A glazed link or open walkway has less impact on the sense of space.

Consider drainage. A new roof between buildings will collect rainwater that needs somewhere to go. You may need gutters, downpipes and a connection to your existing drainage system or a soakaway.

Ground levels matter too. If the floors of the two buildings sit at different heights, you will need steps or a ramp within the link, which adds complexity and cost.

Budget for the full scope of work, including drainage, foundations and any internal alterations needed where the link meets each building. Costs vary significantly depending on whether you choose an open pergola or a fully enclosed heated corridor.

Finally, think about access for maintenance. Glass roofs need cleaning, and any structure will require occasional repairs. Make sure you can reach all parts of the link safely.

The Next Step

Now that you have read through the advice above, you might want to put it into practice. Our Planning Permission Checker lets you tell us about your planned extension and find out whether you need planning permission or can build under permitted development. Try it now →