Keynor Estate mastic sealing
Mastic sealing for building owners, managing agents and housing associations in Keynor Estate and across West Sussex. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Estate-wide sealant that is simply worn out
- Worn sealant at communal door frames
- Repeated reactive repairs to the same buildings
Mastic sealing for Keynor Estate sites
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
After the work
Sealant joints are maintenance items, and their life depends on movement, exposure, cleaning and use. Our advice:
- Make mastic part of routine maintenance checks
- Protect low-level joints in entrances
- Share the asbestos register when you send details
- Encourage occupiers to report problems at 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.
Joints on a building age together so a single failure is a sign to check the rest. Doing them together saves going back again and again.
About our mastic sealing in Keynor Estate
Across Keynor Estate and the rest of West Sussex, we work the same way: send details, get a fixed quote, we seal, and the work is guaranteed. A list of buildings, a few photographs and approximate joint numbers are enough for a quick quote or we can visit. We work on external wall and movement joints, balcony and threshold joints and communal kitchens and washrooms, and the usual reasons a site gets in touch are cracked, hardened mastic round windows on a block and the same joint failures repeated across a portfolio. Searching for sealant specialists in Keynor Estate? We’ve been sealing commercial buildings since 2005.
For owners with a single building near Keynor Estate, we plan to finish in one visit where possible. Photos of each elevation help us quote accurately.
We stand by our work: 12 months, guaranteed. It covers how we prepared and applied the sealant, and if something we did falls short, we return to it.
- Where
- Keynor Estate (PO20)
- Wider area
- West Sussex
- Cover
- A 12-month guarantee
- Quote
- A fixed quote before we start
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
Should maintenance staff do it?
Putting right a botched joint often costs more than sealing it well at the start, because the whole bead must be removed and the faces cleaned back again. That’s why many clients bring in a specialist from the beginning.
For a quick touch-up, site staff may be fine, but anything bigger is another matter: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.
Places near Keynor Estate
What else we do in Keynor Estate
Mastic sealing in Keynor Estate: the local picture
With the shore within about 1 mile, Keynor Estate counts as a coastal location. Sea-facing elevations take driven rain and salt, and their mastic shows it before the sheltered sides do; plan inspections around that. Keynor Estate sits in one of the drier corners of the country, the South East. Outside mastic still needs a dry joint and the right temperature, and elevations facing the sun and the prevailing weather are normally where frame mastic ages first.
Older community buildings, St Mary Our Lady Sidlesham among them, often have frames of mixed ages whose mastic varies. Student accommodation around universities such as University of Chichester (4.7 miles north-east of Keynor Estate) is usually managed block by block, which suits a planned mastic programme.
Keynor Estate is about 2 miles north of Selsey, in West Sussex. Any commercial site in Keynor Estate is covered, for single jobs and planned programmes alike. Across West Sussex, 373 places are covered, including Keynor Estate. Portsmouth is covered too, around 13 miles from Keynor Estate.
We cover the PO20 postcode districts. Buildings on Chalk Lane and Cow Lane are within our area. Sites close to Keynor Estate are covered too, including Sidlesham (1 mile north-east), Street End (1 mile north), Church Norton (2 miles south-east), Sidlesham Common (2 miles north) and Pagham (2 miles east). Bigger towns within reach include Bognor Regis (5 miles east), Chichester (5 miles north), Littlehampton (12 miles east), Rustington (13 miles east), Angmering (14 miles east) and Portfield (5 miles north).
What’s near Keynor Estate
Recent enquiries here include premises near The Academy. The closest station to Keynor Estate is Chichester station, about 4.4 miles north. Nearby you will also find Selsey Lifeboat Museum (2.9 miles south) and St Richard's Hospital (5.2 miles north).
Your questions answered
Is Keynor Estate too far out for you?
No. Small places get the same service as large ones. London and every South East county are within our area. Where we can, we group nearby jobs to make the most of each trip.
Can you work at a site such as Enborne Business Park, by Keynor Estate?
Yes, sites like Enborne Business Park are within our area, along with the rest of Keynor Estate. To start, just phone 01277 525 020 or send photos by email with the unit, the joints involved and your access times.
Do you take on small jobs?
Small jobs are welcome alongside larger packages. Photos and a description are enough to start.
Can you work to our specification?
Yes. The specification and the manufacturer’s installation guidance are what we work to.
Will you just go over the old sealant?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, since fresh sealant will not bond reliably to aged material.
Is mastic sealing guaranteed?
Our workmanship carries a 12-month guarantee, backed by public liability insurance.
Will you come and look before quoting?
Many jobs can be quoted from photographs, drawings or a joint schedule. Where they aren’t, we arrange a site visit before quoting.
Why act early in Keynor Estate
Open external joints let water into walls and around frames. That can lead to damp, staining and damage to finishes and those cost far more to put right. Older rural buildings around Keynor Estate move with the seasons, and rigid or tired sealant can’t keep up. The right product, sized to the joint, copes much better.
The specified product makes a difference, as does the preparation each joint needs, from cutting out to priming and backing rod. Access, phasing and site rules also count.
Why us?
- Fully insured, including public liability cover
- Fixed quotes based on photos, drawings or a visit
- Colour options checked against the specified product
- Over 20 years of commercial sealing
Read how commercial sealant jobs are priced and how we’re accredited.
Cost factors for mastic joints
To price the job, we consider:
- Working within restricted access windows
- Which sealant the job calls for
- Travel to remote or island sites
- How accessible the joints are
Access often affects the price as much as the sealing: joints within easy reach take less time than ones that need access equipment. Mention the access as part of your enquiry.
Details that help us quote
However big the job, the same details help:
- Any specification or named product
- Photos of the joints, close up and from further back
- Whether an asbestos survey exists
- Where the site is, with the postcode
Tell us about the building, the joints and when you need the work done, and we’ll put a fixed quote together. To get it moving, phone 01277 525 020 or email the details over.
How a job runs
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 usually takes anything from a day to a few weeks, depending on the number of buildings and joints. For work around Keynor Estate, we aim to finish in one visit, so we ask for photos and rough sizes first. 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.
- We agree the programme and dates with you.
- Failed sealant is removed and the faces prepared.
- Joints are resealed and tooled.
- We check the finished work and confirm the guarantee.
Getting the site ready
- Tell us your opening times and when work is allowed
- Let us know about inductions and permits
- Point out parking and an unloading spot
Getting a fixed quote
The quickest route to a quote is a few photos and the site postcode. Upload them with the quote form, or speak to us on 01277 525 020 or email the details over if you’d rather talk the job through.
Related advice
Do you need mastic sealing in Keynor Estate?
In communal areas, joints take knocks from bins, bikes, buggies and deliveries, and low-level joints get damaged. Regular cleaning wears them further.
If one of these sounds familiar, it’s time for a closer look:
- Cracked, hardened mastic round windows on a block
- Leaks at window and door perimeters
- Communal area joints that look neglected
- Failed external movement joints
Schools and community buildings such as Sidlesham Primary School need frame and external mastic kept sound like any building.
Comparing quotes
- Their plan for phasing and protecting the area
- Who will actually carry out the work
- The named product and why it was chosen
- Are they CHAS accredited or on Constructionline?