Welling construction mastic
Mastic packages for new-build and refurbishment projects throughout Welling and nearby, carried out by CSCS-carded applicators. CHAS accredited and fully insured.
- A long mastic snag list close to completion
- External joints sealed in damp or cold conditions that are now failing
- Frame perimeters left unsealed or poorly sealed
Construction mastic for Welling sites
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Your questions answered
Do you cover business parks and estates near Welling, such as Old Bexley Business Park?
Yes, sites like Old Bexley Business Park are within our area, along with the rest of Welling. Send details of the unit and the work through our quote form for a quick quote.
Do you take on work at healthcare sites like Memorial Hospital?
Yes, hospitals are one of the sectors we cover. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.
What hours do you work?
Mention the site’s hours and access windows in your enquiry, and we will plan around them. You can reach the office between 8am and 5pm, Monday to Friday.
Can staff carry on working while you are here?
Typically, yes. Phased work can be planned so areas stay in use.
How long will the new sealant last?
There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Treat them as maintenance items and inspect them regularly.
Do you use the sealant named in the specification?
The specification decides the product. Product standards such as BS EN 15651 are often named in specifications.
How do you choose the sealant?
A specification, where there is one, decides it. If there isn’t one, it comes down to the joint: its movement, its surfaces and what it has to cope with.
Construction mastic in Welling, done properly
Refurbishment work needs a slightly different approach from new build. Existing joints have to be stripped back to sound faces, because fresh sealant can’t key into cured silicone, and on older buildings we ask for the asbestos survey before disturbing anything. After that, the joints are prepared and sealed to the specification. If you have different trades sealing to different standards and existing joints on a refurb that need cutting out and resealing, we can help. One point of contact handles commercial sealant work in Welling from the first photos to the final walk-round, for single jobs and planned programmes alike.
A great deal of London construction is refurbishment of occupied or part-occupied buildings, alongside new blocks. Replacement windows, recladding and fit-outs leave perimeter and facade joints to seal, often next to people still using the building, so tidy, well-planned work matters.
Work we carry out comes with a 12-month guarantee. Should something we installed fail, call the office on 01277 525 020 or email the details over and we’ll come back to it.
- Where
- Welling (DA16, DA15, DA6)
- Region
- Greater London
- Guarantee
- A 12-month guarantee
- Price
- A fixed quote before we start
- Call
- 01277 525 020
- Last updated
- 3 November 2026
What happens if it’s left?
When a package runs over budget, downgrading the product is a common first thought. The saving is small next to the cost of callbacks and defects, especially externally. Where an alternative is genuinely suitable, we will say so. In Welling, each extra visit means more notices, permits and disruption, so a proper job first time, with the old sealant fully removed, is worth it.
Cost follows what’s involved: stripping out, preparation, sealing, access and phasing. Call for a fixed quote and we’ll explain how it’s made up.
Why choose Mastic Doctor in Welling
- CHAS accredited
- A Constructionline member, so easy to vet
- 12 months’ guarantee on every job
- Commercial sealant work since 2005
See how commercial sealant jobs are priced and our accreditations and insurance.
Towns and villages near Welling
More services for Welling
What we can’t put right
We seal joints; we don’t mend everything behind them. On its own, sealant can’t deal with:
- Designing joint widths or choosing the specification (that sits with the designer)
- Glazing units that are cracked or misted
- Joints damaged after sign-off by following trades
If in doubt, phone 01277 525 020 or send details through our quote form and we’ll say what we think.
Where we work in Welling
- Window and door perimeters
- Internal decorators’ caulk
- Sanitary and kitchen joints
- Brick and block movement joints
- Floor and skirting junctions
- Cladding and panel joints
Looking after the joints
Your facilities or cleaning team can help the joints last. Share these points with them:
- Keep finished joints away from paint, plaster and scrapers
- Share drawings and the specification as soon as possible
- Put any product change through the designer first
- Note which sealant went where at handover
Once an area is sealed, protect it from following trades. New beads should be left to cure before cleaning or decorating nearby, and that time depends on the product, temperature and joint depth.
Sealing outside when the joint is damp or too cold leads to poor adhesion. Holding off until conditions suit avoids callbacks so external sequencing builds in some flexibility.
From enquiry to sign-off
Our CSCS-carded applicators arrive with the sealants, primers and backing rod the job calls for. Joint faces are cleaned back to sound, dry surfaces, primer goes on where the manufacturer specifies it, and the sealant is tooled off neatly. All of Greater London is in the ULEZ, and kerbside space in Welling can be scarce. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.
- First we look at the scope on site or from drawings.
- You receive a fixed quote covering scope, products and sequence.
- Paperwork is agreed and applicators are inducted on site.
- Sealing follows the programme as areas are released.
- Any frame gaps or issues outside our scope are flagged to the site team.
- Final snagging is completed and the 12-month guarantee applies.
Before we start on site
- Send your site hours and access windows
- Send any specification or drawings in advance
- Warn occupants and staff about the work
Quotes
Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to call the office on 01277 525 020 or send details through our quote form with what you know.
Read more
Construction mastic around Welling: what changes locally
Site traffic in Welling falls within London’s ULEZ, like everywhere else in Greater London. Deliveries are booked and storage is tight, so mastic materials come in as needed. There are a number of hotels within about 2 miles of Welling. Hotel extensions and refits normally have to fit around bookings, so mastic dates are tight.
Projects at colleges like Rose Bruford College, 1.4 miles to the south of Welling, tend to run to term dates, so the mastic is planned tightly. Building work at universities like University of Greenwich Avery Hill Campus (1.6 miles south-west of Welling) is often timed for the summer, mastic included. For a contractor working at a hospital such as Memorial Hospital, 2.1 miles west of Welling, perimeter and facade sealing is planned around patients and deliveries.
Welling is about 9 miles east of London, in Greater London. We cover Welling, with the same fixed quotes and 12-month guarantee as everywhere else. 764 places across Greater London fall within our area, Welling among them. London is covered too, around 9 miles from Welling.
Commercial sites across DA16, DA15 and DA6 are covered. For a building on Days Lane, Hook Lane and Lyme Road or nearby, we can quote for mastic packages. You will find Welling on or near the A207. Close to Welling, our area also takes in Crook Log (1 mile east), Blendon (1 mile south-east), Upton (1 mile east), Bexleyheath (1 mile east) and West Heath (1 mile north-east). A short drive away, we cover London (9 miles west), City of Westminster (12 miles west), Marylebone (12 miles west), Kensington (14 miles west), St Pancras (11 miles north-west) and Shoreditch (9 miles north-west).
Landmarks near Welling
Recent enquiries here include premises near Nags Head pub, Danson Park and Bexley Grammar School. For rail, the closest station is Welling station, roughly 0.5 miles north-west of the centre. Nearby you will also find Greenwich Castle (5 miles west) and Broadway Shopping Centre (1.6 miles east). For a walk, there’s The Tarn and Summer Hill.
Work for main contractors and building owners
Hotels, schools, healthcare sites, offices and retail units come to us directly as well. The work is planned around how the building runs, so the building keeps working while we do.
CHAS accredited and a Constructionline member, we are straightforward to vet for your supplier list. Our insurance certificate can be sent along with the quote.
Should maintenance staff do it?
Redoing a failed joint typically 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.
Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and we will confirm the paperwork you need with the quote.