Keyhaven construction mastic
Mastic packages for new-build and refurbishment projects in Keyhaven. CHAS accredited and fully insured, with a 12-month guarantee.
- Different trades sealing to different standards
- Missed perimeter joints on a new elevation
- Frame gaps too wide for sealant alone
Construction mastic near Keyhaven
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Construction mastic in Keyhaven, done properly
Mastic follows everyone else, which means it absorbs every delay upstream. We agree a sequence at the start and adjust it as the site manager releases areas, so applicators arrive when areas are genuinely ready. Sealing too early only means coming back once others have damaged it. If you are dealing with existing joints on a refurb that need cutting out and resealing and mastic snags holding up handover, we can put it right, whatever the surface. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in Keyhaven, preparation and product choice get the time they need.
Sites around smaller places like Keyhaven can be a fair drive from suppliers, so we come with everything the package needs, timed to the stage the job has reached. Drawings, photos and the programme let us give a fixed quote.
The 12-month guarantee is for workmanship rather than 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
- Keyhaven (SO41)
- Region
- Hampshire
- Guarantee
- 12 months on every job
- Price
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
Commercial clients in Keyhaven
As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. We are fully insured, and our insurance certificate can go with the quote.
Hospitality, education, healthcare, office and retail clients come to us directly as well. The work is planned around how the building runs, so the building keeps working while we do.
Places near Keyhaven
More services for Keyhaven
Our process
Before any cutting starts, the area is protected: masking tape along the joint edges and sheeting over anything nearby. The work itself normally takes as long as the agreed sequence needs, which comes down to joint lengths, access and handover dates, and we clear our waste as we work. Rural sites near Keyhaven may need directions, gate codes or a contact on site. Send that with the details and we’ll confirm the plan with the quote.
- We walk the site or review drawings to understand the package.
- You receive a fixed quote covering scope, products and sequence.
- Site paperwork is confirmed and our CSCS-carded applicators are inducted.
- Sealing follows the programme as areas are released.
- Any frame gaps or issues outside our scope are flagged to the site team.
- The package is closed out, snags cleared and backed by our 12-month guarantee.
Getting the site ready
- Point out parking and an unloading spot
- Share the asbestos register for older buildings
- Agree which areas must stay open
Ask for a quote
Photos, drawings or a schedule of the joints are often enough for a fixed quote. Where a site visit makes more sense, we’ll arrange one.
Advice
Leave it or put it right?
A cheaper sealant can look like an easy saving on a large package. A failed joint in the defects period costs far more than the product difference, especially externally. We price the specified product and will tell you plainly where an alternative would or wouldn’t work. Halls, stores and units around places like Keyhaven may not be checked every day, which gives a failed joint time to do damage. Renewing joints in good time avoids the problem.
A quote for mastic packages depends on how many there are, their condition and the access, and any specification that applies. Call for a quote.
Why us?
- Fixed quotes based on photos, drawings or a visit
- Products installed to the manufacturer’s instructions
- A range of standard colours, depending on the product
- Old sealant cut out, never sealed over
Take a look at how commercial sealant jobs are priced or how we’re accredited.
Maintenance after handover
Once the work is signed off, a little attention goes a long way:
- Flag uneven or tapered frame gaps early
- Share drawings and the specification as soon as possible
- Keep finished joints away from paint, plaster and scrapers
- Note which sealant went where at handover
Tell the builders’ clean team which areas have new sealant. Blades and abrasive pads are the commonest cause of damage at the final clean.
Sanitary joints that fail early become defects soon after occupation. Leaks behind showers and basins damage finishes and floors, leaving the remedial work to the contractor. Getting the product and preparation right first time avoids that.
Your questions answered
Is Keyhaven too small for you to travel to?
Not at all. Keyhaven is within our area. We cover Greater London and the counties of the South East. Send photographs and a list of what needs doing, and we will plan the job to need as few trips as possible.
Our building in Keyhaven is near the coast: does that change the sealant?
It can. Driven rain and salt are tougher on outside sealant than sheltered inland conditions. That puts more weight on product choice, primers where the manufacturer specifies them, and correct joint sizing.
Are you CHAS accredited?
Our applicators hold CSCS cards, and we’re CHAS accredited and a Constructionline member. We are also fully insured, with five million pounds of public liability cover.
What site paperwork can you supply?
Each site asks for different documents, so list what you need, whether RAMS, insurance or CSCS details, and we’ll confirm with the quote.
Can the sealant be colour-matched?
Often, yes. Many products come in a range of standard colours, and matching to RAL references or surrounding finishes is often possible. We’ll confirm the colours available for the specified product.
Do you take on small jobs?
We quote for single jobs as well as large packages and programmes. Send details for a fixed quote.
Is the mastic package guaranteed?
The work is guaranteed for 12 months, covering how we sealed. Protecting sealed areas from following trades helps avoid damage.
Site staff or a sealant specialist?
Redoing a failed joint normally costs more than getting it right at the outset, because the whole bead must be removed and the faces cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.
Site maintenance staff can often handle a short internal joint. The usual problems come from preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.
How the job changes by surface
Snagging before handover
Snagging is often the final mastic stage. Snags are cleared room by room.
Fire-rated sealant where specified
Where the specification calls for fire-rated or intumescent sealant around service penetrations or linear gaps, we install it to the manufacturer’s tested detail. The design and sign-off of fire stopping sit with the designer, principal designer or fire engineer; we work to the specification and the manufacturer’s installation guidance.
Facades, frames and programmes in Keyhaven
Keyhaven sits close to the coast, within about 1 mile. Schemes this close to the sea see their facade joints tested by wind and rain from the day they’re sealed, so joint design, primers and product choice deserve extra care. Keyhaven sits in one of the drier corners of the country, the South East. Winter mornings still bring frost and condensation on frames and panels, so external mastic is timed for workable conditions and agreed with the site manager.
School extensions, at buildings such as Milford-on-Sea Church of England Primary School, normally run to the summer holidays, mastic included. For a contractor working at a hospital such as Lymington New Forest Hospital, 3.4 miles to the north of Keyhaven, perimeter and facade sealing is planned around patients and deliveries. Work at a hotel such as Milford House Hotel (to the west of Keyhaven) tends to be programmed around bookings, mastic included.
Keyhaven is about 3 miles south of Lymington, in Hampshire. We cover commercial sites throughout Keyhaven. We work across 723 places in Hampshire, from busy centres to rural villages. There’s a separate page for Southampton, roughly 16 miles from Keyhaven.
We cover the SO41 postcode districts. Buildings on New Road, Keyhaven Road and Saltgrass Lane are within our area for mastic packages. Sites close to Keyhaven are covered too, including Milford on Sea (1 mile west), Lymore (1 mile north-west), Lower Pennington (1 mile north-east), Everton (2 miles north-west) and Pennington (2 miles north). A short drive away, we cover Totton (14 miles north), Hythe (12 miles north-east), New Milton (4 miles north-west), Ringwood (13 miles north-west), Warsash (15 miles north-east) and Barton on Sea (4 miles west).
What’s near Keyhaven
In Keyhaven, that means premises near The Gun Public House and Priestlands School. For rail, the closest station is Lymington Town station, roughly 3 miles north-east. Other landmarks nearby include St Barbe Museum and Art Gallery (2.8 miles north-east) and Yarmouth Castle (3.3 miles east). For a walk, there’s Milford on Sea LNR and Tennyson Down.