Balconies and roof terraces in Newcastle

What does a balcony or terrace in Newcastle need?

Balconies in Newcastle are often re-waterproofed when the ceiling below starts to stain. On many older balconies, the membrane was laid under tiles or screed with no way to inspect it, so by the time the leak appears, water may have been tracking under the surface for a long time.

Newcastle's flat roofs are mostly on newer estates where the first extension roofs are now being replaced, with plenty on 1930s semis with flat-roofed garages and kitchen extensions too. Northern Ireland averages roughly 1,150 mm of rain a year, spread over many wet days, so a roof that sheds water quickly to clear outlets lasts far longer than one that holds puddles.

How much does balcony or terrace waterproofing cost in Newcastle?

At Northern Ireland guide rates, a 12 m² balcony in a liquid-applied system including scaffold comes to £1,650–£2,850 including VAT. The fixed price comes after a free survey for new and replacement roofs.

Which waterproofing system is best for a balcony?

For most small balconies, a liquid-applied membrane is the practical choice, because it is brushed or rolled on and forms one continuous layer around posts, door frames and outlets with no seams to fail. Many systems include a hard-wearing, anti-slip topcoat.

GRP fibreglass gives a rigid, walkable surface and suits balconies left exposed rather than paved. On larger roof terraces under paving or decking, single-ply membranes are common, and mastic asphalt has a long record on concrete terraces and blocks of flats.

The choice also depends on what goes on top. Paving on pedestals protects the membrane, while an exposed balcony needs a system rated for foot traffic in its own right. We specify the build-up at survey.

What's included?

• Lifting and setting aside of existing paving or decking
• New liquid, GRP, single-ply or asphalt waterproofing
• Free survey of the deck, falls, outlets and door thresholds
• Sealed details at doors, outlets, walls and balustrade posts

Building control in Northern Ireland

In Northern Ireland, Technical Booklet F1 sets roof insulation at 0.18 W/m²K when a roof over a heated room is renovated or newly built, where that's feasible. The district council's building control should be contacted before work starts, and we prepare the details it asks for. More on the rules.

Which nearby areas do we also cover?

• Downpatrick · 10 mi
• Warrenpoint · 17 mi
• Newry · 18 mi
• Banbridge · 18 mi
• Carryduff · 21 mi
• Lisburn · 22 mi

Other flat roof work in Newcastle

• Flat roof surveys and leak tracing
• Garage roofs
• Green and sedum roofs
• GRP fibreglass roofing
• Liquid-applied roofing
• Single-ply membrane roofing
• All services in Newcastle