Balconies & Raised Decking London

Raised decking costs more than ground-level decking because the sub-frame is more complex and materials are greater. As a guide, raised decking up to 600mm off the ground typically costs £130–200 per m² installed. Elevated structures above 600mm run from £200 to £350+ per m². A new balcony added to an existing property varies considerably depending on structural complexity — typically £4,000 to £12,000 or more. Balustrades add £120–400 per linear metre depending on specification. We provide detailed, itemised quotes after a proper site visit.

Standard garden decking up to 300mm above ground level usually falls within permitted development and does not require planning permission. Raised decking above 300mm requires permitted development approval. A new balcony added to an existing house does require planning permission in most cases. If you live in a conservation area, national park or listed building, stricter rules apply. We advise on this as part of our site visit process — before any work is quoted or started.

The sub-frame of a raised deck is typically built in structural softwood or steel, depending on the height and load requirements. The deck surface can be timber or composite — both work well on elevated structures. For very high decks, balconies or structures with significant load, a steel sub-frame may be appropriate. We specify the right structural approach for each project based on the site conditions and design requirements.

Yes. Raised decking can be built over a concrete base using post base fixings that anchor directly into the concrete. This is a clean, secure approach that also maintains ventilation beneath the deck — which matters for the longevity of any timber elements in the sub-frame. It is a common requirement in London gardens, many of which have concrete pads from previous hard landscaping.

Yes — this is one of the most common and effective uses of raised decking. A steeply sloped garden that feels awkward and unusable can be transformed by a well-designed raised deck that levels the usable surface and integrates steps back into the garden below. The posts on a sloped site are of varying heights, which adds structural complexity but is entirely manageable for an experienced team. The result is typically one of the most dramatic garden transformations we carry out.

We offer a full range of balustrade options including frameless glass balustrades, semi-framed glass panels, powder-coated aluminium railings, steel railings and timber balustrade and handrail. The right choice depends on the aesthetic you are after, the height of the structure and your budget. Glass balustrades — both frameless and semi-framed — are currently the most popular choice for raised decking and balconies in London. We will advise on what suits your specific structure during the design stage.

Under current permitted development rules in England, decking up to 300mm above ground level (measured from the highest part of the ground beneath) generally falls within permitted development rights. Above 300mm, you will typically need to apply for permission. These thresholds can change and local restrictions in conservation areas or for listed buildings may differ — so we always advise you to confirm your specific position as part of the site visit process.

A raised garden deck of 20–30m² on a sloped site typically takes three to five working days to build, depending on the complexity of the sub-frame and any balustrade work. A new balcony added to an existing property is typically a five to eight day project depending on the structural scope. More complex structures — multi-level decking, large balconies, structures requiring significant groundwork — may take longer. We give you a realistic timeline with the quote.