Chawton mastic sealing
Mastic sealing for building owners, managing agents and housing associations throughout Chawton and nearby, carried out by CSCS-carded applicators. Fully insured and CHAS accredited.
- Damp patches beside frames
- Draughts at frames across a block
- Window mastic that has split and shrunk
Mastic sealing for Chawton sites
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
When it isn’t the sealant
Part of a good diagnosis is knowing where sealant stops. You will hear from us if the cause turns out to be any of the following:
- Leaks through the frame itself rather than the perimeter
- Misted or failed double-glazed units
- Leaks from above rather than through a joint
If you’re not sure, just speak to us on 01277 525 020 or email drawings and photos and we will give you a straight answer before you book.
What we seal
- Balcony and threshold joints
- Communal entrances and stairwells
- External wall and movement joints
- Window and door perimeters on blocks
- Shopfronts below residential blocks
- Communal kitchens and washrooms
About our mastic sealing in Chawton
There isn’t one mastic for every joint on a building. Window perimeters and external joints often take a low-modulus neutral-cure silicone, and MS polymer sealants stick well to many substrates and often take paint, and colours are confirmed for whichever product is used. Site teams most often ask us about brittle perimeter mastic across a building and occupiers reporting cold air round windows, across external wall and movement joints, communal kitchens and washrooms and communal entrances and stairwells. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: in Chawton, that means joint design, primers and backing rod as standard.
In and around smaller places like Chawton, landlords and agents often look after small groups of housing association properties, converted farm buildings and community buildings. Mastic around frames and on external joints wears out in time, whatever the building.
We sign every job off with a 12-month guarantee. The promise is simple: if the work we did fails within twelve months, we return to fix it.
- Where
- Chawton (GU34)
- Region
- Hampshire
- Cover
- A 12-month guarantee
- Quotes
- Quoted before any work starts
- Call
- 01277 525 020
- Page updated
- 3 November 2026
Your questions answered
Is a smaller place like Chawton outside your area?
Not at all: smaller places are covered as well as towns. We cover Greater London and the counties of the South East. We plan jobs in smaller places so return trips are kept to a minimum.
Can you quote for a block close to Alton station?
Yes. Managing agents, landlords, property factors and housing associations are who this service is for. We work to your notice and access arrangements.
Will you just go over the old 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.
Who decides which product is used?
A specification, where there is one, decides it. Without one, the joint decides: its movement, its surfaces and what it has to cope with.
How do you reach windows on upper floors?
Access is discussed and agreed before the quote is fixed. Tell us the number of storeys and whether scaffold or other access is planned, and we will tell you how we’d approach it.
How do you handle work on occupied blocks?
Residents and tenants carry on as normal. We flag any areas that need internal access well before the dates so you can arrange it with occupiers.
When can the area be used after sealing?
Curing time varies by product, and we confirm it on the day.
Different surfaces, different methods
Tenement and older buildings
Older buildings, including Scotland’s sandstone tenements, have their own joint details. We look at the substrate before choosing a sealant.
External movement joints
Failed sealant is removed, backing rod inserted to control depth and the joint resealed with a grade whose movement class fits.
After the work
Cleaning and maintenance staff play a part too. Share these points with them:
- Keep a record of when each building was resealed
- Plan resealing building by building rather than complaint by complaint
- Check sealant joints during planned building inspections
- Check the asbestos register before any old mastic is disturbed
Protect entrance and corridor joints from knocks where possible. Knocks cause many early failures in communal areas.
Left open, joint edges in render, brick or frames can deteriorate. Once that happens, repairs come before resealing and the job grows.
From enquiry to sign-off
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. After that, any old or failed material is removed, each joint is prepared and the new sealant goes in. For work around Chawton, we aim to finish in one visit, so we ask for photographs and rough sizes first. Then the right materials arrive with us.
- We check the asbestos register for older buildings and look at the joints.
- The products and programme are set out in a fixed quote.
- Failed mastic is removed completely.
- Joint faces are cleaned, backed and resealed.
- We finish each building before moving to the next.
Before we start on site
- Have the specification and drawings to hand
- Let building users know which areas are affected
- 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 ring 01277 525 020 or email a schedule or drawings if you’d rather talk the job through.
Read more
Also in Chawton
Work for main contractors and building owners
As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.
FMs need a contractor who is easy to get on site. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we will confirm them with the quote.
Why it’s worth doing now in Chawton
Sealing over failed mastic looks tidy for a while. It doesn’t bond and usually fails within a short time. Full removal and proper preparation is what lasts. One visit to deal with every failing joint makes more sense than several trips to a place like Chawton, rather than one at a time. Photos of every joint help us quote for the whole job.
Small jobs and large programmes are priced from the same things: scope, access, product and programme. Call for a quote and we will put a fixed figure on it.
What you get with us
- Work carried out by CSCS-carded applicators
- Coloured sealants to suit the setting, where available
- A Constructionline member, so easy to vet
- Joints cleaned back to sound surfaces
Take a look at how commercial sealant jobs are priced and how we’re accredited.
Mastic sealing around Chawton: points for this area
The South East is one of the drier parts of the UK. Even so, frame mastic only goes on in dry, workable conditions, and the sunniest, most exposed sides of a building typically need attention first. Chawton is about 46 miles from central London. Around the capital’s commuter belt, managing agents look after many blocks close to stations and town centres; their frame mastic often ages block-wide.
Older community buildings, Church of St Nicholas among them, often have frames of mixed ages whose mastic varies. If your remit includes a building such as Chawton Church of England Primary School, frame and door mastic can be programmed for the holidays. Historic properties like Bentworth Hall (2.8 miles west of Chawton) show the age of some local stock, where frame mastic must suit soft brick or stone.
Chawton is about 1 mile south-west of Alton, in Hampshire. Anywhere in GU34, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. 723 places across Hampshire fall within our area, including Chawton. Reading is covered too, around 22 miles from Chawton.
Commercial sites across GU34 are covered. Streets here include Winchester Road and Wolf's Lane, and sites on any of them can send details for a fixed quote. Just outside Chawton, we also work in Alton (1 mile north-east), Upper Farringdon (2 miles south), Lower Farringdon (2 miles south), Farringdon (2 miles south) and Hartley Mauditt (2 miles south-east). Further afield, our area takes in Basingstoke (10 miles north-west), Winchester (15 miles west), Farnborough (15 miles north-east), Fleet (12 miles north-east), Aldershot (13 miles north-east) and Petersfield (9 miles south).
Landmarks near Chawton
We work on buildings around The Greyfriar pub and Amery Hill School. Chawton’s nearest station is Alton station, about 1.6 miles north-east of the centre. A little further out are Allen Gallery (1.3 miles north-east) and Alton Community Hospital (less than half a mile north). Open spaces near Chawton include King's Hill.