Mastic contractors in Chelsea
Planning work on a mastic package in Chelsea? We look at it, seal it with the right product and hand it over with a 12-month guarantee.
- Different trades sealing to different standards
- Caulk cracking where joints are moving more than expected
- Old sealant on a refurbishment that needs stripping before new work
Construction mastic across Chelsea
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Honest limits
Honesty saves time and money. Fresh joints won’t solve:
- Defective windows, doors or glazing units (the supplier or installer’s job)
- Fire-stopping design or sign-off (that’s for the designer, fire engineer and building control)
- Joint design decisions that belong to the architect or engineer
Not sure which it is? You can call 01277 525 020 or email a schedule or drawings and we’ll tell you honestly.
Joints and surfaces we work on
- Window and door perimeters
- Brick and block movement joints
- Cladding and panel joints
- Floor and skirting junctions
- Sanitary and kitchen joints
- Internal decorators’ caulk
Construction mastic for commercial buildings in Chelsea
Mastic Doctor has been a subcontractor on construction projects for over 20 years. We price from drawings and the specification, agree the sequence with the site team and seal as areas are released. To price a package in Chelsea, send drawings and the specification through our quote form. The enquiries we see most involve early adhesion failures on new external joints and a mastic package split between trades with no clear owner, on internal decorators’ caulk, window and door perimeters and cladding and panel joints. Facilities teams, main contractors and managing agents in Chelsea tend to want the same three things: a clear scope, tidy work and joints that don’t fail again.
Building sites in London tend to be tight: limited storage, booked deliveries and access shared with other trades. We fit around the programme, sealing each elevation or floor as other trades hand over.
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.
- Place
- Chelsea (SW3, SW10, SW1X, SW1W)
- Region
- Greater London
- Guarantee
- 12 months on every job
- Price
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Different surfaces, different methods
Snagging before handover
Snags usually come from damage by following trades, missed joints or poor earlier work. We price snagging as part of the package or as a separate visit, depending on what suits the programme.
Internal decorators’ caulk
Where the specification calls for it, acrylic decorators’ caulk goes on non-moving internal gaps before painting. It’s for gaps that stay still and get painted, and we use a flexible sealant where there’s movement.
Your questions answered
Do you work in London buildings with loading restrictions?
Yes. Booked loading bays, goods lifts and permit-to-work systems are normal for London jobs. The building manager’s rules go straight into our method.
Would you work within a site like Royal Brompton 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.
How much does the work cost?
We don’t publish prices, because every site is different. Send photographs or drawings and we will price it at a fixed figure.
Do you cover Chelsea?
Yes. We take on work across Chelsea, and the same phone number covers every area.
When can the area be used after sealing?
Curing time varies by product, and we confirm it on the day.
Do you take on mastic snagging only?
Yes. Share the list and photos, and a fixed quote follows.
Can you work plot by plot or floor by floor?
We follow the trades through the building. Each plot, floor or elevation is sealed when it’s ready, and we will raise anything that holds the work up.
New build and refits around Chelsea
A 2-mile radius around Chelsea takes in a good number of hotels. Hotel extensions and refits typically have to fit around bookings, so mastic dates are tight. As part of Greater London, Chelsea is inside the ULEZ, which applies to every van on site. London sites also mean booked deliveries and limited storage, which the mastic programme has to allow for.
For a contractor working at a hospital such as Royal Brompton Hospital (under half a mile west of Chelsea), perimeter and facade sealing is planned around patients and deliveries. University estates such as Faculty of Medicine (Imperial College London), less than half a mile west of Chelsea, tend to have a rolling programme of new buildings and refurbishments, each with window perimeters and facade joints to seal.
Chelsea is about 2 miles south-east of Kensington, in Greater London. Businesses, contractors and managing agents in Chelsea use us for work on mastic packages. Across Greater London, 764 places are covered, Chelsea among them.
We take on mastic packages across the SW3, SW10, SW1X and SW1W postcode area, whatever the building. Streets here include Markham Square, Wellington Square and Tedworth Square, and sites on any of them can send details for a fixed quote. With the B302 and B304 nearby, Chelsea is easy to get to with materials and equipment. Sites close to Chelsea are covered too, including Brompton (1 mile north), South Kensington (1 mile west), Little Chelsea (1 mile south-west), Belgravia (1 mile north-east) and World's End (1 mile south-west). Bigger towns within reach include London (3 miles east), St Pancras (3 miles north-east), Shoreditch (5 miles north-east), Walthamstow (9 miles north-east), Hoxton (5 miles north-east) and Whitechapel (5 miles north-east).
Near you in Chelsea
Around Chelsea, our work takes us to commercial buildings near Burton’s Court, St Thomas More RC Language College and Markham Arms Public House, among other places. You will also find Natural History Museum Library and Archives (0.7 miles north-west) and Hellenic College of London (0.5 miles north). For rail, the closest station is London Victoria station, about 1 mile north-east. Well-known places in the area include Baynard's Castle (3.2 miles north-east) and Harrods (0.7 miles north). Not far away are Campden Hill and Battersea Park Lake.
Should maintenance staff do it?
The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.
A short, simple internal joint is often within reach of a maintenance team. The usual problems come from preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.
When to call us in Chelsea
A joint without backing rod or bond-breaker often fails early. Fixed to three faces, the sealant rips the first time the joint opens so we set the depth properly before sealing.
Any of the following is a good reason to get the joints checked over:
- Bath and shower joints scraped during the final clean
- Frame gaps too wide for sealant alone
- A mastic package split between trades with no clear owner
- Old sealant on a refurbishment that needs stripping before new work
Units on estates such as Brompton Cross District Shopping Centre. (to the north of Chelsea) tend to be reclad and refitted as tenants change, and each job leaves cladding and perimeter joints to seal.
What to look for in a quote
- What the guarantee covers, and for how long
- Proof of insurance
- Their approach to joint depth and backing
- Whether primer will be used where the manufacturer specifies it
Nearby places to Chelsea
Also in Chelsea
How a job runs
Before we leave any area, we remove the tape, clean down and inspect every joint with your site contact. Where the sealant needs time to cure before use, we tell you and sign the area. Most London premises stay occupied while we are on site, so zones and timings are agreed with whoever manages the building. Phased work keeps the rest of the building in use.
- We start with the drawings, specification and programme.
- We take off quantities and return a fixed quote.
- We agree with the site team which areas come first.
- Each area is sealed when it’s released.
- Joints are prepared, backed and sealed to the specification.
- After snagging, the work is handed over under our 12-month guarantee.
Getting the site ready
- Let us know about inductions and permits
- Share the asbestos register for older buildings
- Tell us which areas need to stay in use
Ask for a quote
Need a figure for a tender or a budget? Send the scope and any drawings, and we’ll return a fixed quote you can plan around. For a chat about it beforehand, phone 01277 525 020 or email the details over.
Related advice
Leave it or put it right?
Leaving mastic to whichever trade is fitting the element can look cheaper on paper. In practice it often means different standards, gaps in responsibility and snags nobody owns. A single mastic package gives one point of responsibility. Repeat call-outs disrupt occupied London buildings, so cutting the old sealant out fully and doing it right once is the better route.
Every site prices differently: joint size, product, access and site hours all play a part. A fixed quote follows once we understand the job.
Why clients in Chelsea choose us
- Work to your specification and the manufacturer’s guidance
- A range of standard colours, depending on the product
- Work carried out by CSCS-carded applicators
- Health and safety: CHAS accredited
Take a look at what affects the cost or our accreditations and insurance.