Construction and new-build mastic in Osterley, Greater London
Mastic packages for new-build and refurbishment projects in Osterley. CHAS accredited and fully insured, with a 12-month guarantee.
- Old sealant on a refurbishment that needs stripping before new work
- Perimeter gaps outside the sealant’s range
- Window and door perimeters that won’t pass inspection
Need construction mastic in Osterley?
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Construction mastic in Osterley, done properly
On a new build, the mastic package is one of the last trades through each area, so it lands at exactly the point the programme is tightest. We work as a mastic subcontractor to main contractors and developers, sealing plot by plot or floor by floor as areas are released. We work on brick and block movement joints, floor and skirting junctions and sanitary and kitchen joints, and what we’re called in for most is failed sealant in an existing building being refurbished and bath and shower joints scraped during the final clean. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in Osterley, preparation and product choice get the time they need.
Building sites in London tend to be tight: small compounds, delivery slots and shared hoists and scaffold. Mastic is usually one of the last trades on each elevation or floor, so we keep to the programme and the order of trades the site sets.
Whoever the client is, the cover is the same: twelve months on the work we carried out. Faults in the structure, damage and other trades’ work fall outside it, and we say so plainly.
- Location
- Osterley (TW7, TW3, TW5)
- Region
- Greater London
- Guarantee
- 12 months on every job
- Quotes
- A fixed quote before we start
- Call
- 01277 525 020
- Updated
- 3 November 2026
Questions we’re asked in Osterley
Can you cope with the access rules in a London building?
Yes, we plan every London job around the building’s own access rules. The building manager’s rules go straight into our method. All of Greater London is inside the ULEZ, and our planning allows for it
Can you take on a job at a hospital such as West Middlesex Hospital?
Yes. Healthcare sites are among the places we work. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.
Which sealant will you use?
Where there’s a specification, we use the product it names. If not, we choose for the movement, the surfaces and the conditions, in line with the manufacturer’s guidance.
Will you quote for a small job?
Small jobs are welcome alongside larger packages. Photos and a description are enough to start.
Can you send site paperwork?
Let us know which documents the site needs, such as RAMS, an insurance certificate or CSCS details, and we will confirm them with the quote.
How do we ask for a quote?
There are four steps: send details, get a quote, we seal, guaranteed. The first step only needs photos and a postcode.
How do you work with the site programme?
We seal plot by plot or floor by floor as areas are released. The sequence is agreed with the site manager at the start and adjusted as things change.
Leave it or put it right?
Patching snags as they appear can feel quicker than a proper close-out. A planned sweep of each plot or floor catches the lot in one go and saves applicators coming back again and again. We can run snagging as its own phase before handover. Getting scaffold, permits or access booked in Osterley takes effort, so while access is arranged it pays to renew all failing joints, not just the worst.
Every site prices differently: the joint sizes, the specified product, access and working hours each have a bearing. Send the details and a fixed figure follows.
Why us?
- One phone line for London, the South East and Scotland
- Workmanship guaranteed for 12 months
- Work to your specification and the manufacturer’s guidance
- A fixed quote before work starts
Take a look at our cost guide and our accreditations.
How a job runs
We begin with a short walk round with whoever looks after the building, to confirm the scope, the order of work and any areas we must keep clear. After that, any old or failed material is removed, each joint is prepared and the new sealant goes in. In Osterley, most buildings stay in use during the work, so zones and timings are agreed with whoever manages the building. Areas are handed back as each section is finished.
- We price from the drawings, specification and programme you send.
- You receive a fixed quote listing scope, products and phasing.
- Any site paperwork you need (RAMS, insurance certificate, CSCS details) is confirmed with the quote.
- Work follows the programme, area by area, as rooms and elevations become ready.
- Every joint is prepared, set to depth and sealed with the specified product.
- Before handover, snags are dealt with and the package is signed off under our 12-month guarantee.
What we need from you
- Let building users know which areas are affected
- Let us know about inductions and permits
- Move anything stored against the joints
Get a fixed quote
Let us know the site, the scope and your timescale, and a fixed quote will follow. The easiest way is to ring 01277 525 020 or send photos by email.
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New build and refits around Osterley
Plenty of hotels sit less than 2 miles from Osterley. When hotels extend or refit, the work is normally squeezed between peak periods, mastic included. The ULEZ covers the whole of Greater London, Osterley included, so site vehicles need to meet its standards or pay the daily charge. Delivery slots and scarce storage shape how and when the mastic goes in.
Further education sites such as Great Oaks College (under half a mile south-west of Osterley) are extended and refurbished from time to time, with mastic often programmed into the summer break. When units on a site such as Metro Industrial Centre, 0.9 miles south-east of Osterley, are refurbished or reclad, the panel joints and window perimeters are part of the mastic package.
Osterley is about 1 mile north of Hounslow, in Greater London. We cover Osterley and the rest of Greater London, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. We work across 764 places in Greater London. Our London page has more on work in that area.
Business premises anywhere in TW7, TW3 and TW5 are within our area. Buildings on Jersey Road, Church Road and Gresham Road are within our area for mastic packages. Sites close to Osterley are covered too, including Spring Grove (1 mile south-east), Lampton (1 mile south-west), Norwood Green (1 mile north-west), Gillette Corner (1 mile east) and Woodlands (1 mile south). Further afield, our area takes in London (11 miles east), City of Westminster (9 miles east), Marylebone (9 miles east), Kensington (6 miles east), St Pancras (10 miles east) and Shoreditch (12 miles east).
What’s near Osterley
In Osterley, that means premises near The Plough Public House, Spring Grove Primary School and Inwood Park. The closest station to Osterley is Isleworth station, about 0.9 miles south-east. A little further out are Museum of Army Music (2.1 miles south) and West Middlesex University Hospital (1.3 miles south-east). The countryside around Osterley includes Castlebar Hill and Garden Lake.
Nearby places to Osterley
Other services in Osterley
How the job changes by surface
Fire-rated sealant where specified
Fire-rated sealant is one type of fire-stopping product. Other products are used for some services and gaps. Tell us what records you need and we will confirm with the quote.
Bathrooms, en suites and washrooms
On multi-unit schemes, consistency matters across hundreds of bathrooms. One applicator team gives the same finish everywhere.
When to call us in Osterley
A joint without backing rod or bond-breaker often fails early. Bonded to the base of the joint and both sides, sealant can’t stretch evenly, so depth is controlled with backing rod or bond-breaker tape.
Common reasons buildings call us in:
- Sanitary sealant damaged by following trades
- Old sealant on a refurbishment that needs stripping before new work
- Perimeter gaps outside the sealant’s range
- Snag items on joints that need redoing before handover
For contractors on a campus like University of London, 0.9 miles to the south-east of Osterley, facade and perimeter sealing has to fit around students and term dates.
Before you book anyone
- What the guarantee covers, and for how long
- Whether their applicators hold CSCS cards
- Their public liability cover
- The named product and why it was chosen
After the work
Once the work is signed off, these steps help:
- Ask installers to correct oversized gaps first
- Get the mastic subcontractor involved early in the programme
- Put any product change through the designer first
- Keep scrapers and abrasive pads off new beads
After we have sealed an area, it helps to keep other trades from damaging the joints. New beads should be left to cure before cleaning or decorating nearby; we confirm the time for each product.
Sanitary joints that fail early become defects soon after occupation. Water gets behind trays, vanity tops and panels, and the repair falls into the defects period. Proper preparation, with the right silicone first time, keeps it off the defects list.
Owners, agents and contractors
When you manage a building on behalf of an owner, clear figures and clear communication matter. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative.
Housing associations and managing agents often need work done across blocks and communal areas. We phase the work so people keep access, and each stage is agreed with your contact.