New Build Sealant Contractor: Plot-by-Plot Mastic and Silicone Sealing
Housebuilders and developers use our team as their new build sealant contractor, sealing every plot inside and out, from bathroom silicone and kitchen worktops to external window mastic, so each home is ready for handover on programme.
Sealant that keeps plots moving to handover
On a new build site, the sealant trade comes near the end of every plot, after the bathrooms, kitchens and windows are fitted and before the decorators and cleaners finish. A late or messy sealant gang holds up the whole sequence. We plan our new build mastic and new build silicone work around your build programme, so plots are sealed as soon as they are ready and signed off quickly.
We work for housebuilders, developers and main contractors on houses, apartments, student blocks and mixed-use schemes. Plot sealing can be booked one block at a time or as a full site package, with a named team that knows the house types.
Internal mastic and silicone on every plot
Bathrooms and en-suites
Baths, shower trays, basins, WCs and tiled walls sealed with mould-resistant sanitary silicone.
Kitchens
Worktops, sinks, upstands and splashbacks, colour-matched to the worktop.
Window boards and reveals
Internal window board, frame and plaster joints sealed neatly.
Skirting and architrave
Decorators caulk and acrylic sealant at skirting, architrave and staircase joints, ready for paint.
Door frames
Internal and external door frame and threshold joints.
Service penetrations
Pipe and cable penetrations sealed where the specification asks for a sealant finish.
See our internal mastic and bathroom sealant pages for more detail on internal work.
External window mastic and perimeter joints
Externally we seal window and door frame perimeters, sills, cladding and brickwork movement joints, render stop beads and soffit and fascia junctions. External new build mastic is applied from scaffold where it is still up, or from towers and MEWPs after the scaffold is struck. We match colours to the frames and brick, and use low-modulus silicone, MS polymer or polyurethane sealants to suit the substrate.
Brickwork and blockwork movement joints are cut back, backed with closed-cell backing rod and sealed to the specified depth. See expansion and movement joints and window and door mastic.
Snagging, NHBC inspections and handover
Sealant is one of the most common items on a snagging list: gaps behind a bath, a missed corner on a window board or a messy line at a worktop. We return to clear sealant snags quickly, both before your own pre-handover inspection and after the homeowner moves in, so the NHBC inspection and the customer demonstration go smoothly.
- Pre-handover snagging visits, plot by plot
- Homeowner snags cleared in occupied homes, booked directly with your customer care team
- Photos of completed plots on request for your records
- Tidy, clean finish with masking and protection removed
How we work with site managers
Plot release
The site team releases plots as they are ready, and we book them into the programme.
Seal and inspect
Each plot is sealed and checked by our supervisor before we sign it off.
Report
We tell the site manager which plots are complete and which are waiting on other trades.
Snag
Any snags are cleared on the next visit.
Our operatives are CSCS carded and the company holds Constructionline Silver. Method statements and risk assessments are supplied for every site, and we carry full insurance.
New build sealing across the region
Our team has over 20 years in construction behind it and seals new build plots across London, the South East, the Midlands, the East of England and the South. Whether it is a small development of a dozen houses or a phased scheme of several hundred homes, we can supply a reliable gang and a clear plot rate quote. See our commercial mastic contractor page or our sealant cost guide.
Insured & pre-qualified
Peace of mind for homeowners, builders and main contractors.
- £10m Employer’s LiabilityInsurance cover
- £5m Public Liability & Professional IndemnityInsurance cover
- Constructionline Silver member
- CSCS Skilled WorkerSealant Applicator (NVQ Level 2)
Over 20 years in construction
Products we use
Professional-grade sealants and adhesives from leading manufacturers.
Brand names and logos are trademarks of their respective owners and are shown to identify products we use. No endorsement is implied.
New build sealant: common questions
Do you price new build sealing per plot?
Yes. We usually quote a plot rate for each house type, plus a separate rate for external mastic and any communal areas.
Can you clear homeowner snags after handover?
Yes. We visit occupied homes to clear sealant snags, booked through your customer care team.
Do you do internal and external sealant?
Yes. One team can cover bathrooms, kitchens, window boards, skirting and external window and door mastic on the same site.
Are your operatives CSCS carded?
Yes. Our team is CSCS carded, and method statements and risk assessments are supplied for every site.
Need a sealant gang for your plots?
Send us the house types and programme. Send a photo on WhatsApp, email office@pioneersealants.co.uk or call 01234 607 252, and we will tell you what is needed.
- Opening hours
- Monday – Friday8:00am – 6:30pm
- Saturday9:00am – 4:00pm
- SundayClosed
