Balconies and roof terraces in Dartford

What does a balcony or terrace in Dartford need?

Door thresholds are a common reason for balcony work in Dartford. Where a door was fitted with a low step-out and no drainage channel, water driven against the frame finds its way under the sill. Re-waterproofing gives the chance to rebuild that detail properly.

Dartford's flat roofs are mostly on 1930s semis with flat-roofed garages and kitchen extensions, with plenty on lock-up garage blocks on estates too. Much of the South East sits in the drier Thames catchment at roughly 730 mm of rain a year, so the usual failures are at joints, upstands and outlets rather than from sheer volume of rain.

How much does balcony or terrace waterproofing cost in Dartford?

At South East guide rates, a 12 m² balcony in a liquid-applied system including scaffold comes to £2,100–£3,600 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?

• Sealed details at doors, outlets, walls and balustrade posts
• Lifting and setting aside of existing paving or decking
• Strip-out of the failed membrane and deck repairs
• Free survey of the deck, falls, outlets and door thresholds

Building regulations in England

Replacing more than half of a flat roof over a heated room usually counts as renovating a thermal element, so the roof is insulated to around 0.16 W/m²K where that's technically and economically feasible, and the work is notified to building control: the council or a registered building control approver, unless a registered competent person self-certifies it. A roof on a new extension is built to 0.15 W/m²K. Patch repairs, and most unheated detached garages, don't trigger the upgrade. Structural changes, or a new covering that adds 15% or more to the roof's weight, also need approval. More on the rules.

Which nearby areas do we also cover?

• Swanley · 4 mi
• Swanscombe · 4 mi
• Longfield · 5 mi
• South Ockendon · 5 mi
• Grays · 5 mi
• Gravesend · 7 mi

Other flat roof work in Dartford

• GRP fibreglass roofing
• Flat roof replacement
• Garage roofs
• Flat roof repairs
• EPDM rubber roofing
• Commercial flat roofing
• All services in Dartford