Keymer mastic sealing
Mastic sealing for building owners, managing agents and housing associations in Keymer and across West Sussex. CHAS accredited and fully insured, with a 12-month guarantee.
- The same joint failures repeated across a portfolio
- Occupiers reporting cold air round windows
- Damaged joints in communal entrances and corridors
Mastic sealing in Keymer
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Looking after buildings in and around Keymer
Keymer is in the South East, one of the UK’s drier regions. Outside work still depends on dry joints, and elevations facing the sun and the prevailing weather are usually where frame mastic ages first. At about 40 miles from central London, Keymer is within reach of the capital. Commuter-belt towns tend to have plenty of managed blocks near stations and town centres.
If you manage student housing near a university such as University of Sussex, 4.4 miles south-east of Keymer, the summer turnaround is the time for mastic. Older community buildings, St Cosmas and St Damian Church among them, often have frames of mixed ages whose mastic varies.
Keymer is about 2 miles south of Burgess Hill, in West Sussex. Businesses, contractors and managing agents in Keymer can call on us for mastic joints, as part of our coverage of West Sussex. Across West Sussex, 373 places are covered, including Keymer. For work in that direction, see our Brighton page, about 6 miles away.
If you need mastic sealing in BN6, the process matches everywhere else we work: send details, get a quote, we seal, guaranteed. For a building on Flowers Close, The Quadrant and Kymer Gardens or nearby, send details and we’ll quote for mastic joints. We also cover Hassocks (1 mile west), Ditchling (1 mile east), Clayton (1 mile south-west), Hurst Wickham (1 mile north-west) and Westmeston (2 miles south-east). Nearby towns on our patch include Crawley (13 miles north), Horsham (13 miles north-west), Worthing (14 miles south-west), Haywards Heath (5 miles north), East Grinstead (15 miles north) and Shoreham-by-Sea (8 miles south-west).
Near you in Keymer
In Keymer, that means premises near The Greyhound Public House and Downlands Community School. For rail, the closest station is Hassocks station, about 0.5 miles west. Well-known places in the area include The Dene Hospital (3.2 miles north-west) and Clayton Castle (1.2 miles south-west). For a walk, there’s Ditchling Beacon and Bedelands Farm Nature Reserve.
How we handle mastic sealing in Keymer
Before work starts, most agents and landlords want the documents in order. For documents, tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we will confirm with the quote. We are CHAS accredited and a Constructionline member, with public liability insurance. We work on window and door perimeters on blocks, external wall and movement joints and balcony and threshold joints, and the failures we’re asked to look at most are water getting in round frames after rain and failed external movement joints. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, in Keymer it comes down to the same thing: failed joints cut out, faces prepared and the right sealant laid to the right depth.
For landlords and associations with stock in and around Keymer, grouping buildings into one visit saves travel. One quote can cover a whole list of addresses.
A 12-month guarantee applies to all our work in West Sussex. Should something we installed fail, ring 01277 525 020 or email drawings and photos and we’ll come back to it.
- Where
- Keymer (BN6)
- Wider area
- West Sussex
- Cover
- 12 months on our workmanship
- Quote
- A fixed quote before we start
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
Signs you need mastic sealing in Keymer
UV and rain age external sealant. The surface chalks, the body stiffens and cracks appear most of all on the sunniest and most exposed elevations.
Common reasons buildings call us in:
- Worn sealant at communal door frames
- Open joints in brickwork or panels
- No planned programme for sealant
- Draughts at frames across a block
Schools and community buildings such as The Windmills Junior School need frame and external mastic kept sound like any building.
Before you book anyone
- How joint depth will be controlled
- Will failed sealant be removed rather than covered?
- How they handle RAMS and site documents
- Who will actually carry out the work
Keeping the joints sound
For the best life from the joints:
- Avoid piecemeal callouts where you can
- Reduce knocks to communal area joints
- Encourage occupiers to report problems at frames
- Track which buildings were done and when
Keep records of when each building was resealed. That makes future programmes easier to plan and gives you a history.
Left open, joint edges in render, brick or frames can deteriorate. Once that happens, repairs come before resealing.
Why it’s worth doing now in Keymer
Reacting to every complaint means sending someone out block by block. Planned resealing covers a whole building or estate in one go and is simpler to manage and budget. A failed joint lets water into a building whatever its size. Early resealing avoids the damage that follows a leak.
A quote for mastic joints depends on quantities, condition and access, and any specification that applies. Call for a quote.
Why clients in Keymer choose us
- Failed material removed, not covered up
- Products installed to the manufacturer’s instructions
- 12 months’ guarantee on every job
- Fully insured
Take a look at what affects the cost and how we’re accredited.
How a job runs
A typical day starts with protection: masking tape along the joint edges and sheeting over anything nearby. The work itself typically takes one or more days per building, depending on the joint lengths and the access, and we clear our waste as we work. If neighbouring businesses or buildings around Keymer need work too, visits can be combined. Tell us your site hours and we’ll plan around them.
- We inspect each building and record the joints that have failed.
- The quote is fixed and split as suits you.
- Dates and areas are agreed so occupiers can be told.
- Failed sealant is removed and the faces prepared.
- Joints are resealed and tooled.
- Each building is checked and signed off with the 12-month guarantee.
Getting the site ready
- Tell us your opening times and when work is allowed
- Explain the parking and delivery arrangements
- Move anything stored against the joints
Ask for a quote
Tell us about the building, the joints and when you need the work done, and a fixed quote will follow. The easiest way is to ring 01277 525 020 or email the details over.
Read more
Quoting for work in Keymer
What shapes the price:
- Travel to remote or island sites
- Which sealant the job calls for
- Whether the work must be split into stages
- Site requirements such as inductions and permits
The work involved drives the cost: stripping out, preparation, sealing, access and phasing. Call for a quote.
Sending details for a quote
Diagnosis starts before we arrive. Tell us:
- Photos of the joints, close up and from further back
- Access details, including height
- Any specification or named product
- Whether an asbestos survey exists
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.
What else we do in Keymer
FAQs: Keymer
Is Keymer too small for you to travel to?
No. Places such as Keymer are covered as much as the big towns. Our area covers London and the South East counties. Where we can, we group nearby jobs to make the most of each trip.
Will you take on work at estates like Victoria Business Park, close to Keymer?
Yes. Estates, retail parks and business parks around Keymer, Victoria Business Park among them, are all within reach. Send details of the unit and the work through our quote form for a quick quote.
Who decides which product is used?
Where there’s a specification, we use the product it names. If not, we choose for the movement, the surfaces and the conditions, in line with the manufacturer’s guidance.
Does weather matter for sealant work?
It can, when the joints are outside. Wet joints and cold, damp or frosty conditions stop the sealant bonding properly, so we watch the forecast and rearrange outside work if we have to. Indoors, the weather is rarely a problem.
Do you supply RAMS and insurance details?
We are CHAS accredited, a Constructionline member and carry public liability insurance. For specific documents, tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we will confirm with the quote.
Can people stay in the building while you reseal?
Residents and tenants carry on as normal. We flag any areas that need internal access well before the dates so it can be arranged.
Is it fine to apply new sealant on top of old?
No. Overlaying old sealant is a frequent cause of early failure, so everything comes out first.
Doing it in-house
The visible bead is only part of the job. Correct depth, the right primer and a sealant matched to the movement are easy to get wrong without experience.
For most general trades, sealant is a sideline. A specialist prepares properly, controls joint depth and picks a product with the right movement class.