The Mastic Doctor team standing beside their branded vans outside an office building
East Sussex · England

Facade and window perimeter sealing in The Platt, East Sussex

Need facade sealing in The Platt? Send us the details for a fixed quote, backed by a 12-month guarantee on the work.

  • Sealant pulling away from frames or panels
  • Unsightly perimeter sealant on a visible elevation
  • Leaks at window and door perimeters
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
Signed off, with 12 months’ guarantee.
South East, London & Scotland
Constructionline member
Fully insured: £5m PL

Facade sealing across The Platt

Photos, a specification or a quick description of the joints is enough to start a fixed quote.

Facade sealing in The Platt

We don’t install glazing systems or replace glass. What we seal are the joints around them: the frame-to-structure perimeter, panel-to-panel joints and window and door surrounds, using sealants classified for facade or glazing use. We work on coping and flashing joints, cladding panel joints and stone and brick facade joints, and the usual reasons a site gets in touch are new sealant peeling off old mastic and gaps between rainscreen or cladding panels. Looking for mastic applicators who cover The Platt? We’ve been sealing commercial buildings since 2005.

For a site near The Platt, the mastic visit is planned so the right sealants, primers and backing rod are on hand. Drawings, photos and the programme let us give a fixed quote.

We stand behind the joints we seal: 12 months, guaranteed. It covers how we prepared and applied the sealant, and if something we did falls short, we return to it.

Location
The Platt (TN3)
Region
East Sussex
Guarantee
12 months on every job
Quotes
A fixed quote before we start
Telephone
01277 525 020
Updated
3 November 2026
The Mastic Doctor team standing beside their branded vans outside an office building

How a job runs

We begin with a short walk round with whoever looks after the building, agreeing which joints are in scope, where to start and what must stay open. Then we strip out anything that has failed, prepare every joint and seal it. For work around The Platt, we aim to finish in one visit, so we ask for photos and rough sizes first. Then the right materials arrive with us.

  1. We plan access and the order of elevations with the client.
  2. We only seal when joints are dry and within the product’s temperature range.
  3. Each joint is cut out and the edges inspected.
  4. Joints are cleaned, primed if required and fitted with backing rod.
  5. Sealant is gunned in and tooled hard onto both faces.
  6. Once signed off, the work carries our 12-month guarantee.

Getting the site ready

  • Tell us which areas need to stay in use
  • Let us know about inductions and permits
  • Share your working hours and any access restrictions

Getting a fixed quote

Every quote starts with the facts: what’s there, how much of it, how we reach it and what’s specified. Share whatever details you have and we’ll fill any gaps with a visit.

Get a price

Advice

What sets the cost

A fixed quote reflects the actual work. It allows for:

  • Location, for remote and island sites
  • Quantities, in metres or numbers
  • The size and state of each joint
  • Specialist products, such as fire-rated or hygienic sealants

Access can matter as much as the joints themselves: easy-to-reach joints are quicker than those that need equipment to get to. Mention the access as part of your enquiry.

What to include in your enquiry

Good information means a firmer quote. Helpful details to send:

  • Any dates the work must fit around
  • How the joints are reached, and at what height
  • Photos of the joints, close up and from further back
  • Where the site is, with the postcode

For a fixed quote, ring 01277 525 020 or send details through our quote form with the site address and an outline of the work. Our quote form is another easy route.

Common questions from The Platt clients

Is The Platt too small for you to travel to?

Not at all. The Platt is within our area. Our area covers London and the South East counties. Send photographs and a list of what needs doing, and we’ll plan the job to need as few trips as possible.

Can you work at a site such as Durgates Industrial Estate, by The Platt?

Yes. Estates, retail parks and business parks around The Platt, Durgates Industrial Estate among them, are all within reach. Photos and a short description are enough for a first look.

Are you fully insured?

Yes. We’re fully insured, including public liability cover.

How long do sealant joints last?

There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Treat them as maintenance items and inspect them regularly.

Can you look at water coming in around a frame?

Yes. Photos help, and you can ring 01277 525 020 or email us to arrange a visit. Many frame leaks are sealant failures, though not all, and we will be honest about which it is.

Will you come and look before quoting?

Photos, drawings or a schedule are often enough to quote. Where they aren’t, we arrange a site visit before quoting.

How do we ask for a quote?

You can use the quote form on this site; alternatively, call the office on 01277 525 020 or use the quote form. Include photos or drawings if you have them.

Commercial clients in The Platt

When you manage a building on behalf of an owner, clear figures and clear communication matter. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative, plus a 12-month guarantee.

Hospitality, education, healthcare, office and retail clients book us directly too. We plan around the way the building is used, so guests, pupils, patients or staff are disturbed as little as possible.

Facade sealing around The Platt: how the place shapes the job

The Platt is about 33 miles from central London. Towns within reach of London tend to keep building, from flats to offices and schools, and each scheme needs its mastic sealed to programme. The South East is one of the drier parts of the UK. Winter mornings still bring frost and condensation on frames and panels, so we time external mastic for dry faces and agree it with the site team.

University estates such as Canterbury Christ Church University - Salomons, 4.9 miles to the north of The Platt, tend to have a rolling programme of new buildings and refurbishments, each with window perimeters and facade joints to seal. Hotel extensions and refits, at places such as The Abergavenny Arms Hotel, 0.9 miles north of The Platt, typically run between busy periods, so the sealing is squeezed into short windows. For a contractor working at a hospital such as Tunbridge Wells Homeopathic Hospital, which lies north of The Platt, perimeter and facade sealing is planned around patients and deliveries.

The Platt is about 4 miles south of Royal Tunbridge Wells, in East Sussex. We cover commercial sites throughout The Platt. We work across 308 places in East Sussex. There’s a separate page for Brighton, about 25 miles away.

Business premises anywhere in TN3 are within our area for facade joints. Nearby places we also cover include Frant (1 mile north), Mark Cross (2 miles south), Eridge Green (2 miles north-west), Town Row (3 miles south-west) and Tidebrook (3 miles south) for facade joints. Nearby towns on our patch include Hailsham (15 miles south), Crowborough (5 miles south-west), Uckfield (11 miles south-west), Heathfield (8 miles south), Upper Horsebridge (14 miles south) and Hellingly (14 miles south).

What’s near The Platt

In The Platt, that means premises near The George Public House and Eridge Park. For rail, the closest station is Frant station, about 1.7 miles north-east of the centre. Well-known places in the area include The Corn Exchange (2.9 miles north) and The Amelia (3.4 miles north). The countryside around The Platt includes Broadwater Warren RSPB Reserve.

Map of The Platt © OpenStreetMap contributors

Looking after the joints

Cleaning and maintenance staff play a part too. Pass these on to them:

  • Brief window cleaners about newly sealed joints
  • Insist on a full cut-out when joints are renewed
  • Walk the elevations once or twice a year
  • Keep the sealant details on the building file

Record the sealant type and date on the building file. Future work can then match the product and colour.

Deal with sections that fail early as soon as they show. A few metres resealed promptly can stop water damage spreading behind the facade.

What the job involves on each surface

Window and door perimeters

Frames grow and shrink with temperature, and the perimeter joint has to follow. The rod limits depth, leaving the bead able to flex without tearing.

Perimeter joints at frames and structure

The joint around a framed system, where it meets the structure, needs sealant. Our work is that perimeter joint.

Honest limits

We check first that sealant really is the fix. It isn’t the answer for:

  • Replacing glass or failed glazing units
  • Specialist high-level access methods
  • Leaks from roofs, gutters or failed flashings rather than sealant joints

If in doubt, call 01277 525 020 or email drawings and photos and we will say what we think.

Where we work in The Platt

  • Window and door perimeters
  • Coping and flashing joints
  • Stone and brick facade joints
  • Perimeter joints where frames meet the structure
  • Cladding panel joints
  • Shopfront frames
Accreditations

Trusted. Accredited. Insured.