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

Facade Sealing in Washington

Facade sealing for Washington, from a contractor working since 2005. Fully insured and CHAS accredited.

  • Facade joints cracked through the middle
  • Cold air coming in at window perimeters
  • Patch repairs that keep failing
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Signed off, with 12 months’ guarantee.
Covering the South East & Scotland
CHAS accredited
£5m public liability

Facade sealing near Washington

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

Surface by surface

Perimeter joints at frames and structure

These frame-to-structure joints take a lot of movement and weather. They are cut out, cleaned, backed and resealed with a product suited to glazing perimeters.

Precast concrete panels

Precast arrises sometimes crumble or carry old residue. Faces are cleaned to sound concrete, and damaged edges are reported first.

Facade sealing in Washington

Weather decides a lot in facade sealing. Joints have to be dry and the air and surface temperature within the product’s range, and cold, damp starts can delay work. We plan for that and keep you updated. We work on cladding panel joints, window and door perimeters and shopfront frames, and the failures we’re asked to look at most are new sealant peeling off old mastic and gaps between rainscreen or cladding panels. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: in Washington, that means joint design, primers and backing rod as standard.

Around smaller places like Washington, building work usually means conversions of farm buildings, a few new houses or an extension to a hall or school. Each still needs a proper mastic package: window perimeters, facade joints and internal sealant to the specification.

Every job we finish is backed by a 12-month workmanship guarantee, in Washington as everywhere else we work. If our installation lets you down in that time, we return and fix it.

The Mastic Doctor team beside their liveried vans in front of an office building
Location
Washington (RH20)
Region
West Sussex
Cover
12 months on every job
Quotes
Quoted before any work starts
Telephone
01277 525 020
Last updated
3 November 2026

Doing it in-house

A short, simple internal joint is often within reach of a maintenance team. The usual problems come from preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.

Using site staff can make sense for a small touch-up, but larger jobs are different: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.

Your questions answered

Is Washington too far out for you?

Not at all: smaller places are covered as well as towns. We cover Greater London and the counties of the South East. Where we can, we group nearby jobs to make the most of each trip.

Will you fit the mastic around our build programme in Washington?

Yes. The mastic is planned around your key stages. Let us know which documents your site asks for, and we’ll confirm them alongside the quote.

Do you hold CHAS accreditation?

Yes. CHAS accredited, Constructionline member, and our applicators hold CSCS cards.

Can you work in cold or wet weather?

Rain and frost can pause external sealing. We plan for weather and keep you updated throughout the job.

What’s the quickest route to a quote?

There are four steps: send details, receive a fixed quote, we carry out the work, and it’s guaranteed. Step one needs little more than photos and a postcode.

Are you fully insured?

Yes. Our insurance certificate can be sent alongside the quote.

Can you handle several sites?

Yes. Several buildings can share a single quote, and you deal with one contact throughout across South East England, Greater London and Scotland.

On site: what to expect

When we get to site, we sign in, go through any site induction and check how permits are handled. Everything around the joints gets protected before any cutting starts, and the work normally takes longer on a full elevation than on a handful of window perimeters, and it always depends on dry weather. For a building around Washington, tell us how to find it and who will meet us. Send that with the details and we’ll confirm the plan with the quote.

  1. We look at the joints, the drawings and the access before pricing.
  2. The old bead is cut away completely, not overlaid.
  3. Joint faces are cleaned to firm, sound material, with primer where the sealant maker specifies it.
  4. Closed-cell rod fixes the depth, and the sealant grips two sides only.
  5. A facade-grade sealant rated for the movement goes in, tooled to a concave profile.
  6. We walk the finished joints with you before handing over.

Getting the site ready

  • Make sure the joints can be reached
  • Tell us your opening times and when work is allowed
  • Have the specification and drawings to hand

Ask for a quote

Need a figure for a tender or a budget? We’ll quote against your scope and drawings you can plan around. For a chat about it beforehand, call 01277 525 020 or send details through our quote form.

Get a quick quote

Advice

Signs you need facade sealing in Washington

New sealant run over old sealant rarely holds. Fresh silicone won’t stick to cured silicone, and the patch soon lifts.

What tends to prompt an enquiry:

  • Perimeter sealant that has split or peeled away
  • Air leaks through failed facade joints
  • Cladding panel joints that have opened up
  • Perimeter joints where frames meet the structure

When units on a site such as Rock Business Park, 0.7 miles to the north-east of Washington, are refurbished or reclad, the panel joints and window perimeters are part of the mastic package.

Questions to ask before you book

  • What site paperwork they can supply
  • Who will actually carry out the work
  • Health and safety accreditation such as CHAS
  • What the guarantee covers, and for how long

Questions to ask before you appoint anyone

When it isn’t the sealant

Not every problem is a sealant problem, and we’re upfront when that’s the case. It won’t fix:

  • Providing access systems for the work
  • Work on the window or framing system itself
  • Cracked or spalling substrates that need repair before sealing

Not sure which it is? You can give us a call on 01277 525 020 or email drawings and photos and we’ll tell you honestly.

Surfaces we seal

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

Facade sealing in Washington: the local picture

Washington is about 43 miles from central London. Towns within reach of London tend to keep building, from flats to offices and schools, which keeps mastic packages in demand. The South East is one of the drier parts of the UK. Even so, frost and condensation on steel and glass are common on winter mornings, so external mastic is timed for workable conditions and agreed with the site manager.

Older buildings in the area around Washington, such as Parham House, 3.9 miles to the west of Washington, need care when sealed: the product has to suit soft or historic materials. For contractors at a school such as St Mary's CofE Primary School, sealing has to be finished before term starts.

Washington is about 6 miles north of Worthing, in West Sussex. If you’re looking for facade sealing in Washington, we can help, as we do across West Sussex. 373 places across West Sussex fall within our area, Washington among them. Our Brighton page has more on work in that area, about 13 miles away.

If you need facade sealing in RH20, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. Among the streets we cover are London Road, The Street and Chanctonbury Close. Just outside Washington, we also work in Rock (1 mile north), Sullington (1 mile west), Heath Common (2 miles north-west), Storrington (2 miles north-west) and Warminghurst (2 miles north). A short drive away, we cover Horsham (12 miles north), Worthing (6 miles south), Bognor Regis (15 miles south-west), Haywards Heath (15 miles north-east), Burgess Hill (13 miles east) and Littlehampton (8 miles south-west).

Local landmarks in Washington

In Washington, that means premises near Rydon Community College, Windlesham House School and The Frankland Arms Public House. Well-known places in the area include The Storrington And District Museum (2 miles north-west). Open spaces near Washington include Chanctonbury Hill.

Map of Washington © OpenStreetMap contributors

For managing agents and facilities managers

Facilities managers want contractors who arrive with the paperwork sorted. Tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we’ll confirm with the quote.

If you look after buildings for someone else, you need clear quotes and clear reporting. You get a fixed quote, an agreed scope and a walk round at the end, plus a 12-month guarantee.

Accreditations

Trusted. Accredited. Insured.