Construction and new-build mastic in Four Marks, Hampshire
Our CSCS-carded applicators take on mastic packages for new-build and refurbishment projects in Four Marks and the surrounding area. Send photos or drawings for a fixed quote.
- Failed sealant in an existing building being refurbished
- Oversized or tapered gaps around new frames
- Early adhesion failures on new external joints
Construction mastic for Four Marks sites
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Construction mastic in Four Marks, done properly
Getting a subcontractor through site induction should be simple. Our applicators are CSCS-carded, and we are CHAS accredited and a Constructionline member. Tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we’ll confirm with the quote. We work on floor and skirting junctions, internal decorators’ caulk and cladding and panel joints, and what we are called in for most is missed perimeter joints on a new elevation and inconsistent sealant finishes from plot to plot. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: in Four Marks, that means joint design, primers and backing rod as standard.
Conversions around smaller places like Four Marks often join new frames to old masonry or timber, which leaves joints between old walls and new frames that need a sealant able to take the movement, in a colour the planners or architect are happy with.
Every job ends the same way: guaranteed. You get a 12-month guarantee on our workmanship, and we explain exactly what that covers when we quote.
- Place
- Four Marks (GU34)
- Wider area
- Hampshire
- Guarantee
- 12 months on our workmanship
- Quotes
- A fixed quote before we start
- Call
- 01277 525 020
- Page updated
- 3 November 2026
When something else is needed
Some faults sit outside our scope, and we say so rather than covering them up:
- Deciding which fire-stopping product a penetration needs
- Glazing units that are cracked or misted
- Damage to finishes by other trades after we have sealed
Not sure which it is? You can phone 01277 525 020 or email us and we will tell you honestly before you book.
Where we work in Four Marks
- Brick and block movement joints
- Internal decorators’ caulk
- Window and door perimeters
- Cladding and panel joints
- Sanitary and kitchen joints
- Floor and skirting junctions
Also near Four Marks
Also in Four Marks
Site staff or a sealant specialist?
Certain joints really need a specialist: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. A poor seal in places like these tends to cost more to put right later.
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.
What happens if it’s left?
Some packages split mastic across the window fitter, kitchen fitter and plumber. In practice it often means different standards, gaps in responsibility and snags nobody owns. A single mastic package gives one point of responsibility, with the same standard on every plot. In a smaller place such as Four Marks, getting a contractor back for a second visit takes time, so we’d suggest renewing all the joints that are going, not just the worst.
The product called for affects the cost, and so does the preparation. Access, phasing and site rules also count.
Why clients in Four Marks choose us
- Constructionline member for supplier checks
- One contact handling all your sites
- CHAS accredited contractor
- CSCS-carded applicators
Read our cost guide and our accreditations.
On site: what to expect
In a busy building, the work is phased so only one area is out of use at a time. Each section is protected, cleaned back and sealed, then reopened once the sealant allows before we move to the next. If neighbouring businesses or buildings around Four Marks need work too, visits can be combined. Mention the building’s opening times and we will work within them.
- Drawings, the sealant specification and your programme come to us for pricing.
- A fixed quote sets out the scope, the products and the sequence.
- You tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we confirm it with the quote.
- Areas are sealed plot by plot or floor by floor as the trades hand them over.
- Every joint is prepared, set to depth and sealed with the specified product.
- Snags are cleared before handover and completed areas carry our 12-month guarantee.
Preparing the site
- For older buildings, check the asbestos register before work
- Point out any areas we must not close
- Tell staff and tenants when we’ll be in
Get a fixed quote
A good quote starts with a clear picture: 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.
Related advice
Building owners, agents and FMs in Four Marks
Planned maintenance programmes are welcome: working through a building or an estate in stages that fit your budget. Four Marks can form part of a wider programme across Hampshire.
Agents, factors and owners’ representatives all follow the same route: send details, get a fixed quote, we seal, guaranteed. We can agree access arrangements and keyholder contacts beforehand.
Signs you need construction mastic in Four Marks
Frames installed with uneven gaps make perimeter sealing harder. Every product has limits on how wide a joint it can bridge, so gaps outside that range need sorting by the installer first. Better to raise it at the start than seal a joint that’s bound to fail.
Look out for the following:
- Different trades sealing to different standards
- Failed sealant in an existing building being refurbished
- Frame perimeters left unsealed or poorly sealed
- Internal caulk splitting as the building dries out
For contractors at a school such as Four Marks Church of England Primary School, sealing has to be finished before term starts.
Before you book anyone
- Will CSCS-carded applicators be on site?
- Their pre-qualification and accreditations
- Whether old or failed sealant will be cut out, not overlaid
- What level of public liability insurance do they hold?
Construction mastic in Four Marks: the local picture
Four Marks lies roughly 49 miles out from central London. Commuter-belt towns tend to see a steady flow of new flats, offices and commercial schemes, and main contractors there need mastic that keeps to the programme. Four Marks sits in one of the drier corners of the country, the South East. Still, external mastic needs dry faces within the maker’s temperature limits, which isn’t every day, which is why external dates are agreed with the site manager.
Older buildings in the area around Four Marks, such as Bentworth Hall, which lies north of Four Marks, need care when sealed: the product has to suit soft or historic materials. New wings at hospitals like Alton Community Hospital, 3.3 miles to the north-east of Four Marks, bring long runs of window and panel joints to seal.
Four Marks is about 4 miles south-west of Alton, in Hampshire. We cover commercial sites throughout Four Marks. Four Marks is one of 723 places we cover in Hampshire for mastic packages. We also cover Southampton, some 20 miles away.
We cover the GU34 postcode districts for mastic packages. We cover commercial and managed buildings on Read's Field, River Close and Chalk Close and the roads nearby. Nearby places we also cover include Medstead (1 mile north), Soldridge (1 mile west), South Town (2 miles north-west), New Copse (2 miles north) and Hattingley (2 miles north-west) for mastic packages. A short drive away, we cover Basingstoke (11 miles north), Winchester (12 miles west), Fleet (15 miles north-east), Horndean (14 miles south), Alton (4 miles north-east) and Petersfield (9 miles south-east).
Near you in Four Marks
The nearest railway station is Alton station, about 4.6 miles north-east of the centre. Nearby you will also find Barton Castle (3.5 miles north-west) and Alton Community Hospital (3.3 miles north-east). For a walk, there’s Red Hill.
Four Marks: questions and answers
Is Four Marks too small for you to travel to?
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.
Would you work within a site like Alton Community Hospital?
Yes, provided the work is planned with the site’s estates team. We follow the site’s permits, sign-in and infection-control procedures in every area.
How much does the work cost?
We don’t publish prices, because every site is different. With photographs or drawings, we can give you a fixed quote.
Can you work while the building is occupied?
Typically, yes. Phased work can be planned so areas stay in use, with each area protected and signed.
When is resealing likely to be due?
There isn’t a single answer, because life depends on how much the joint moves, how exposed it is and how it’s cleaned and used. Regular checks let you plan resealing before leaks or damage.
What’s the quickest route to a quote?
The quote form is the simplest route, though you can also phone 01277 525 020 or send photos by email. Include photographs or drawings if you have them.
What site paperwork can you supply?
Requirements differ from site to site, so tell us what you need and we’ll confirm it when we quote.