Mastic Sealing in North Sheen
Sealant work in North Sheen for main contractors, managing agents and facilities managers: mastic sealing for building owners, managing agents and housing associations, quoted at a fixed price.
- Estate-wide sealant that is simply worn out
- Water getting in round frames after rain
- Cracked, hardened mastic round windows on a block
Mastic sealing for North Sheen sites
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Mastic sealing in North Sheen: the local picture
For a London block, the agent or landlord normally handles notices to residents and access to flats. We fit the programme to your notice periods.
Buildings close to stations like Kew Gardens station, under half a mile to the north-west of North Sheen, are often flats over shops, with frame mastic to keep sound. For a school such as Kew Riverside Primary School, perimeter mastic on windows and doors is a holiday job. Churches, halls and community buildings such as The Barn Church are looked after by trustees and committees like any other owner, and their frames, doors and external joints need mastic renewed in time.
North Sheen is about 3 miles south of Acton, in Greater London. North Sheen sits inside our coverage, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. We work across 764 places in Greater London, from busy centres to rural villages. There’s a separate page for London, about 8 miles away.
If you need mastic sealing in TW9, SW14 and W4, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. Buildings on Kent Road, Ibis Lane and The Avenue are within our area for mastic joints. We also cover Kew (1 mile north), Grove Park (1 mile north-east), Strand-on-the-Green (1 mile north), East Sheen (1 mile south-east) and Mortlake (1 mile south-east). Further afield, our area takes in London (8 miles east), City of Westminster (6 miles north-east), Marylebone (6 miles north-east), Kensington (4 miles north-east), St Pancras (8 miles north-east) and Shoreditch (9 miles east).
Near you in North Sheen
We work on buildings around Kew College Prep, Dukes Meadows and Chiswick School, among other places. There’s a railway station in North Sheen itself: Kew Gardens station. Nearby you will also find Barnes Hospital (1.1 miles south-east) and Livat Hammersmith (2.5 miles north-east). Green spaces nearby include Kew Gardens Lake and Duke's Hollow.
Mastic sealing for commercial buildings in North Sheen
Owners and agents usually inherit a building’s mastic rather than choose it, and it ages quietly: window perimeters, door frames, external joints and communal junctions all rely on it. When it hardens, splits or pulls away, water and draughts follow along with complaints. If you have communal area joints that look neglected and patchy repairs in mismatched sealant, we can help, on shopfronts below residential blocks, balcony and threshold joints and external wall and movement joints alike. Whether you call it commercial sealant work, mastic application or joint sealing, the work in North Sheen is the same: failed joints cut out, faces prepared and the right sealant laid to the right depth.
Across Greater London, North Sheen included, the ULEZ applies, and parking and loading rules differ from street to street. For block-wide work, a place to park and store materials saves time on every visit.
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.
- Location
- North Sheen (TW9, SW14, W4)
- Wider area
- Greater London
- Guarantee
- A 12-month guarantee
- Price
- A fixed quote before we start
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Nearby places to North Sheen
More services for North Sheen
General trades versus a specialist
What you see is the finished bead, but most of the work is hidden. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.
For most general trades, sealant is a sideline. A specialist prepares properly, controls joint depth and picks a product with the right movement class, which is what makes a joint last.
Surface by surface
Communal areas
We keep entrances and stairs open throughout. Work is planned in sections.
Commercial and mixed-use buildings
Landlords with commercial portfolios have shopfronts, office entrances and external joints to look after. A planned programme suits multi-building portfolios.
Our process
Where the site stays busy, the work is phased so only one area is out of use at a time. Each area is protected, prepared and sealed before the next one starts. The ULEZ covers the whole of Greater London, and parking near a job is rarely simple. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.
- We inspect the joints, building by building, and record what has failed and why.
- A fixed quote follows, split by block or building if that suits you.
- The sequence and the dates are fixed with you, giving you what you need to notify occupiers.
- We remove the old mastic completely and clean the joint faces back.
- Backing rod and primer go in as the joint requires, then the new bead is placed and tooled.
- Each building is checked on completion and the work carries our 12-month guarantee.
What we need from you
- Agree which areas must stay open
- Have the specification and drawings to hand
- Flag any permit to work we will need
Quotes
Need a figure for a tender or a budget? We’ll quote against your scope and drawings you can plan around. For a chat about it beforehand, phone 01277 525 020 or send photos by email.
Read more
What sets the cost
To price the job, we consider:
- Phasing around occupants
- Quantities, in metres or numbers
- Which sealant the job calls for
- Distance, for remote addresses
The work involved drives the cost: removing old material, preparing the joints, the product, the access and how the work is phased. Call for a quote and we will explain how it’s made up.
Before you send an enquiry
We can often quote from photos and a few details. It helps to include:
- Anything awkward about access or site hours
- The postcode of the building
- What the building is and how it’s used
- Any specification or named product
A handful of photographs and a postcode is the fastest way to a quote. Send them through the quote form, or call the office on 01277 525 020 or email a schedule or drawings to discuss it first.
For managing agents and facilities managers
Whether you’re a managing agent, a property factor or an owner’s representative: send details, get a fixed quote, we seal, guaranteed. Keys, access and contacts can be agreed in advance.
Facilities managers want contractors who arrive with the paperwork sorted. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we’ll confirm them with the quote.
Common questions from North Sheen clients
Will you take on a block within reach of Kew Gardens station?
Yes, and several blocks can go on one quote. Photos of each elevation help us quote accurately.
Can you work in a London building with booked loading and goods-lift slots?
Yes, we plan every London job around the building’s own access rules. Say when the building is occupied and when it’s quiet, and we’ll plan accordingly. The ULEZ covers the whole of Greater London, which we allow for
Can people stay in the building while you reseal?
Occupiers stay in the building throughout. If any flats or units need access, we’ll tell you in advance so it can be arranged.
Can weather delay the job?
It can, when the joints are outside. Wet joints and cold, damp or frosty conditions stop the sealant bonding properly, so external work may be moved if conditions aren’t right. Indoors, the weather is rarely a problem.
How many days will you need on site?
That varies with the scale of the job, but the work usually takes one or more days per building, depending on the joint lengths and the access. For bigger or phased jobs, we will set out a timescale with the quote.
How long will the new sealant last?
There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Sealant joints are maintenance items, so inspect them regularly.
Is North Sheen in your area?
Yes. North Sheen is in our area and the rest of Greater London, within our coverage of Greater London, South East England and Scotland. For a quote, give us a call on 01277 525 020 or email drawings and photos.
Why it’s worth doing now in North Sheen
Replacing mastic before water gets in is a planned job. After water has got in, there may be damp, damaged plaster or decoration to put right too and occupiers notice. In a London building, a failed joint rarely affects only one party: water travels through shared structures, and a small leak becomes a dispute between occupiers. Putting it right early is less disruptive than dealing with the consequences.
The price depends on how many linear metres there are, how much old material needs removing and the access. Call for a quote once you have the details.
Why us?
- Constructionline member for supplier checks
- 12 months’ guarantee on every job
- CSCS-carded applicators
- One contact handling all your sites
Take a look at what affects the cost and our accreditations and insurance.