Mastic Sealing in Forestdale
We carry out mastic sealing for building owners, managing agents and housing associations in Forestdale and the surrounding area. Send photos or drawings for a fixed quote.
- Brittle perimeter mastic across a building
- Complaints coming in block by block
- Old repairs sealed over failed mastic
Mastic sealing in Forestdale
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Mastic sealing in Forestdale, done properly
Owners and agents normally inherit a building’s mastic rather than choose it and it slowly wears out: it sits round windows and doors, along external joints and through communal areas. When it hardens, splits or pulls away, water and draughts follow, and occupiers start reporting it. We work on communal kitchens and washrooms, window and door perimeters on blocks and communal entrances and stairwells, and what we’re called in for most is window mastic that has split and shrunk and old repairs sealed over failed mastic. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in Forestdale, preparation and product choice get the time they need.
London’s ULEZ covers every borough, and parking and loading rules vary street by street. For a block or estate, it helps to know where we can park and stage materials.
Whoever the client is, the cover is the same: a 12-month guarantee on our workmanship. Faults in the structure, damage and other trades’ work fall outside it, and we say so plainly.
- Place
- Forestdale (CR0, CR2)
- Region
- Greater London
- Guarantee
- 12 months on every job
- Price
- Quoted before any work starts
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
Keeping the joints sound
Keep the joints in good shape with a few simple steps:
- Encourage occupiers to report problems at frames
- Have the asbestos survey to hand for older buildings
- Look at the sunniest and most exposed elevations first
- Keep bins and bikes away from communal door frames
If a joint we sealed fails within 12 months, tell us and we’ll look at it. Beyond that, routine checks spot the next round of repairs.
Leaks at window perimeters spoil finishes and can affect frames. Early resealing is far simpler than repairs inside.
Should maintenance staff do it?
Some joints are best left to specialists: for example fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. A poor seal in places like these tends to cost more to put right later.
Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and we’ll confirm the paperwork you need with the quote.
Why deal with it now?
Piecemeal repairs over the years often leave mismatched sealant. A block-wide reseal gives one product, one colour and one guarantee. In a London building, a failed joint rarely affects only one party: water travels through shared structures, and a small leak becomes a dispute between occupiers. Dealing with it early is simpler for everyone.
Quantities, awkward access and phased working all shape the price. So do site requirements such as inductions and permits.
Why choose Mastic Doctor in Forestdale
- Colours chosen to suit frames, cladding or finishes where possible
- Fully insured
- Joints cleaned back to sound surfaces
- Specification-led, product-correct work
Take a look at what affects the cost and how we’re accredited.
Diagnose, treat, sign off
Working in a building that stays open takes some planning. The work area is signed and kept contained, keep walkways clear and work section by section so the rest of the building stays in use. In Forestdale, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.
- We check the asbestos register for older buildings and look at the joints.
- The products and programme are set out in a fixed quote.
- We strip out the old sealant.
- The joints are prepared and resealed with the right product.
- Buildings are completed in turn.
Before we start on site
- Tell us what induction or permit system the site runs
- Send asbestos survey details if the building is pre-2000
- Have the specification and drawings to hand
Request a quote
To get a fixed quote, speak to us on 01277 525 020 or email the details over, telling us the site location and the nature of the job. Our quote form is another easy route.
Related advice
Also near Forestdale
Also in Forestdale
What affects the price in Forestdale
Each job is priced on its own details. The things that drive the figure:
- Working within restricted access windows
- Location, for remote and island sites
- Site requirements such as inductions and permits
- How much existing material needs removing
The work involved drives the cost: stripping out, preparation, sealing, access and phasing. Call for a quote and we’ll explain how it’s made up.
Details that help us quote
A few photos plus some basic facts will normally do. It helps to include:
- What the building is and how it’s used
- Any dates the work must fit around
- Rough lengths or quantities, or drawings if you have them
- The site address and postcode
If there’s a specification, drawings or a tender package, send it with your enquiry, and we will price against exactly what is specified. Smaller jobs need nothing more than photos and a few notes.
Work for main contractors and building owners
Agents, factors and owners’ representatives all follow the same route: send details, get a fixed quote, we seal, guaranteed. We can agree access arrangements and keyholder contacts beforehand.
Hotels, schools, healthcare sites, offices and retail units book us directly too. We plan around the way the building is used, so the building keeps working while we do.
Blocks and managed buildings in Forestdale
In London, mastic work on a block goes through the managing agent or landlord, with notice to residents. We fit the programme to your notice periods.
Blocks of flats and mixed-use buildings often cluster around stations such as Sanderstead station (2.4 miles west of Forestdale) and their window and balcony mastic tends to age at the same rate across a building. With historic buildings such as Addington Palace, 0.9 miles to the north of Forestdale, in the wider area, owners of older properties around Forestdale should expect mastic to need a product that suits old masonry. For a school such as Courtwood Primary School, perimeter mastic on windows and doors is a holiday job.
Forestdale is about 3 miles south-east of Croydon, in Greater London. Commercial clients in Forestdale use us for work on mastic joints, as part of our coverage of Greater London. Forestdale is one of 764 places we cover in Greater London for mastic joints. For work in that direction, see our London page (11 miles or so).
If you need mastic sealing in CR0 and CR2, the process matches everywhere else we work: send details, get a quote, we seal, guaranteed. For a building on Courtwood Lane, Goldfinch Road and Bardolph Avenue or nearby, send details and we’ll quote for mastic joints. Sites close to Forestdale are covered too, including Selsdon (1 mile west), New Addington (1 mile east), Addington (1 mile north), Farleigh (1 mile south) and Fickleshole (2 miles south-east). Bigger towns within reach include London (11 miles north), City of Westminster (13 miles north-west), Marylebone (13 miles north), Kensington (13 miles north-west), St Pancras (13 miles north) and Shoreditch (13 miles north).
Local landmarks in Forestdale
Recent enquiries here include premises near John Ruskin College and Addington Park. The closest station to Forestdale is Sanderstead station, roughly 2.4 miles west of the centre. A little further out are Warlingham Park Hospital (1.9 miles south) and Croydon Airport Visitor Centre (3.5 miles west). For a walk, there’s Nore Hill and Hutchinson's Bank.
Common questions from Forestdale clients
Can you work at a site such as Vulcan Way Industrial Estate, by Forestdale?
Yes. Estates, retail parks and business parks around Forestdale, Vulcan Way Industrial Estate among them, are all within reach. Send details of the unit and the work through our quote form for a quick quote.
Do you work for managing agents with blocks near Sanderstead station?
Yes. Managing agents, landlords, property factors and housing associations are who this service is for. Photos of each elevation help us quote accurately.
What guarantee do you give on resealing?
Our workmanship carries a 12-month guarantee, backed by public liability insurance.
Is Forestdale in your area?
Yes. We take on work across Forestdale, and the same phone number covers every area.
Do you work with property factors and landlords?
Yes, block and estate work is a core part of what we do. We work through buildings in a planned order with dates agreed in advance.
Can you plan resealing across several buildings?
Yes. Each building is inspected, quoted and scheduled in turn, and the programme can start with the worst.
Do you check for asbestos in old sealant?
In older buildings, old mastic can contain asbestos. We ask for the asbestos register or survey before work starts and suspect material is tested first.