Mastic sealant contractors in Washington
Sealant work in Washington for main contractors, managing agents and facilities managers: mastic sealing for building owners, managing agents and housing associations, with a fixed quote first.
- Brittle perimeter mastic across a building
- Communal area joints that look neglected
- Leaks at window and door perimeters
Mastic sealing for Washington sites
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
On site: what to expect
A typical day starts with protection: masking tape along the joint edges and sheeting over anything nearby. The work itself usually takes a day or two for a single block, longer for an estate programme, and we clear our waste as we work. For work around Washington, we aim to finish in one visit, so photographs and measurements up front really help. Then the right materials arrive with us.
- A building-by-building inspection lists the failed joints.
- The quote is fixed and split as suits you.
- Dates and areas are agreed so occupiers can be told.
- Old mastic is removed and the joint faces prepared.
- Joints are resealed and tooled.
- We check the finished work and confirm the guarantee.
Preparing the site
- Tell us which areas need to stay in use
- Let us know about inductions and permits
- Have the specification and drawings to hand
Getting a fixed quote
Let us know the site, the scope and your timescale, and a fixed quote will follow. To get it moving, speak to us on 01277 525 020 or use the quote form.
Advice
Mastic sealing in Washington, done properly
Mastic Doctor has sealed joints on commercial and residential blocks since 2005. Our applicators are CSCS-carded and we hold public liability insurance. Resealed mastic joints in Washington carry our 12-month guarantee. We work on window and door perimeters on blocks, balcony and threshold joints and external wall and movement joints, and the usual reasons a site gets in touch are draughts at frames across a block and open joints in brickwork or panels. Whoever orders the work in Washington, the brief is typically the same: a fixed quote, no surprises on site and a 12-month guarantee behind the result.
For owners with a single building near Washington, we plan to finish in one visit where possible. Photos of each elevation help us quote accurately.
Our 12-month guarantee is about workmanship, not wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we spell out the cover before we begin.
- Where
- Washington (RH20)
- Region
- West Sussex
- Guarantee
- 12 months on every job
- Quote
- Quoted before any work starts
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
Common problems we fix in Washington
Previous repairs often sealed new mastic over old. New sealant won’t grip failed sealant, so these repairs rarely last.
If one of these sounds familiar, it’s time for a closer look:
- Draughts at frames across a block
- Brittle perimeter mastic across a building
- Mastic failing across several blocks on an estate
- Complaints coming in block by block
Property owners at sites such as Rock Business Park (0.7 miles north-east of Washington) can have mastic renewed between lettings.
Questions to ask before you book
- How the existing material will be dealt with
- Who will actually carry out the work
- Whether primer will be used where the manufacturer specifies it
- How they’ll work around occupants
FAQs: Washington
Is a smaller place like Washington outside your area?
No. Small places get the same service as large ones. Our area covers London and the South East counties. Where we can, we group nearby jobs to make the most of each trip.
Can you quote for mastic across several buildings in and around Washington?
Yes. Portfolio-wide programmes are a regular request. Residents are given notice through you, and the work moves building by building.
Do you seal on top of existing sealant?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, because fresh silicone will not bond with aged silicone.
Which sealant will you use?
If the job is specified, we follow the specification. Otherwise, we recommend a product to suit the joint’s movement, the substrate and the conditions, following the manufacturer’s guidance.
Can you take on resealing for a block portfolio?
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.
What if the old mastic contains asbestos?
Some mastics in pre-2000 buildings contain asbestos. We check the asbestos register or survey before disturbing it, and if it’s suspected, work stops until it’s tested.
How long does a typical visit take?
We plan the time on site around your programme and access. We will give you an estimate of time on site when we quote.
Cost factors for mastic joints
What shapes the price:
- Site requirements such as inductions and permits
- The product specified
- Access and working height
- Whether the work must be split into stages
Pricing mastic joints depends on quantities, condition and access. Call for a quote.
Sending details for a quote
Diagnosis starts before we arrive. Let us know:
- Whether an asbestos survey exists
- The site address and postcode
- Any specification or named product
- When you need the work done
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to ring 01277 525 020 or send details through our quote form with what you know.
Towns and villages near Washington
Also in Washington
Why it’s worth doing now in Washington
Sealing over failed mastic looks tidy for a while. It doesn’t bond and usually fails within a short time. Cutting out and resealing properly does it once. One visit to deal with every failing joint makes more sense than several trips to a place like Washington. Photos of every joint help us quote for the whole job.
There’s no price list, since every building and every scope is different. For a fixed figure, call for a quote.
Why clients in Washington choose us
- Over 20 years of commercial sealing
- Public liability insurance in place
- Coloured sealants to suit the setting, where available
- CHAS accredited
Take a look at our cost guide and how we’re accredited.
For owners and agents in Washington
Washington sits in one of the drier corners of the country, the South East. External mastic still waits for dry faces and the right temperature, while the elevations that take the most sun tend to show hardened mastic first. Washington lies roughly 43 miles out from central London. Commuter-belt towns tend to have plenty of managed blocks near stations and town centres, and window and balcony mastic on them tends to age at the same rate.
If you are responsible for a building such as The Parish Church of St Mary, frame and door mastic needs the same attention as any other property. With historic buildings such as Parham House (3.9 miles west of Washington) in the wider area, owners of older properties around Washington should expect mastic to need a product that suits old masonry.
Washington is about 6 miles north of Worthing, in West Sussex. If you are looking for mastic sealing in Washington, we can help. Washington is one of 373 places we cover in West Sussex for mastic joints. Brighton is covered too, some 13 miles away.
Commercial sites across RH20 are covered for mastic joints. Streets here include London Road, The Street and Chanctonbury Close. If your building is just outside Washington, we cover 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).
Landmarks near Washington
Recent enquiries here include premises near Rydon Community College, Windlesham House School and The Frankland Arms Public House, among other places. Well-known places in the area include The Storrington And District Museum (2 miles north-west). Green spaces nearby include Chanctonbury Hill.
Surface by surface
Communal areas
Entrance doors, screens and corridor junctions in communal areas all have sealant joints. Tidy, sound joints keep them looking cared for.
Window and door perimeters on blocks
Frames vary from uPVC to aluminium and timber, so the grade we pick has to bond to frame and wall alike. We’ll confirm the colours available for the specified product.
Commercial clients in Washington
For main contractors, we work as the sealant subcontractor, on new build and refurbishment alike. We work to your programme, your specification and your site rules.
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 will confirm with the quote.