Mastic sealing for building owners and managing agents in Hampstead, Greater London
Work needed on a mastic joint in Hampstead? We assess it, carry out the work and guarantee our workmanship for 12 months.
- Water getting in round frames after rain
- No planned programme for sealant
- Communal area joints that look neglected
Need mastic sealing in Hampstead?
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Building owners, agents and FMs in Hampstead
Building owners and managing agents use us on sealant work across single buildings or whole portfolios around Hampstead. Several sites can go on one quote, which keeps the paperwork simple.
Planned maintenance programmes are welcome: working through a building or an estate in stages that fit your budget. Hampstead can form part of a wider programme.
Mastic sealing in Hampstead, done properly
In buildings from before 2000, some old mastics contain asbestos. Before we disturb it, we ask to see the asbestos register or survey, and work stops for testing if there’s any doubt. We don’t remove asbestos-containing materials. We work on window and door perimeters on blocks, external wall and movement joints and balcony and threshold joints, and the usual reasons a site gets in touch are the same joint failures repeated across a portfolio and occupiers reporting cold air round windows. Looking for mastic applicators who cover Hampstead? Mastic Doctor has worked for contractors, FMs and building owners since 2005.
For managing agents in Hampstead, resident access, notice periods and the building’s rules shape the job. Work is planned with the agent so residents get notice and access is arranged in advance.
Every job ends the same way: guaranteed. You get a 12-month guarantee on our workmanship, and the quote explains what it covers.
- Where
- Hampstead (NW3, NW6, NW11, N2)
- Wider area
- Greater London
- Guarantee
- 12 months on every job
- Price
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
Doing it in-house
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.
For a quick touch-up, site staff may be fine, but anything bigger is another matter: a specialist brings efficiency, a consistent finish and a 12-month guarantee.
After the work
For the best life from the joints:
- Make it easy for occupiers to report draughts
- Start inspections with the most exposed faces
- Reduce knocks to communal area joints
- Mention RAMS, insurance or CSCS requirements up front
Keep bins, bikes and deliveries away from low-level joints where you can. Damage at low level is the most common reason communal joints fail early.
Water getting in round frames can damage plaster, decoration and the frames themselves. Resealing early keeps the job small.
When to call us in Hampstead
Much failed sealant was laid on dirty, dusty or damp surfaces. Without clean, sound faces and a primer where the product needs one it comes away from one face.
Any of the following is a good reason to get the joints checked over:
- Cracked, hardened mastic round windows on a block
- Patchy repairs in mismatched sealant
- Water getting in round frames after rain
- Draughts at frames across a block
Student blocks close to universities like Regent's University London, 2.1 miles to the south-east of Hampstead, are easiest to work on between tenancies.
What your quote should include
- Are they CHAS accredited or on Constructionline?
- Will RAMS and insurance details be available?
- How the existing material will be dealt with
- Can the work be phased to keep areas open?
Diagnose, treat, sign off
Before any cutting starts, the area is protected: tape along each joint edge and covers over finishes, stock and equipment close by. The work itself typically takes anything from a day to a few weeks, depending on the number of buildings and joints, and we clear our waste as we work. All of Greater London is in the ULEZ, and kerbside space in Hampstead can be scarce. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.
- We check the asbestos register for older buildings and look at the joints.
- The products and programme are set out in a fixed quote.
- Failed mastic is removed completely.
- The joints are prepared and resealed with the right product.
- We finish each building before moving to the next.
What we need from you
- Point out parking and an unloading spot
- Let us know about inductions and permits
- Have the specification and drawings to hand
Get a fixed quote
The quickest route to a quote is a few photos and the site postcode. Upload them with the quote form, or speak to us on 01277 525 020 or send photos by email to discuss it first.
Read more
How the job changes by surface
Planned maintenance
We can work into your cyclical maintenance plan, building by building.
External movement joints
The joint width has to suit the movement and the sealant’s capability with the width-to-depth ratio set as the manufacturer advises.
Frames, entrances and external joints in Hampstead
There are four care or nursing homes within about 2 miles of Hampstead. Owners of care premises can bring window and door mastic into a phased programme planned around the home. London blocks come with residents to inform, access to agree and often a concierge or estate office to work with. We plan around the notices and access you arrange.
Property owners at sites such as The Quadrant Business Centre, 1.5 miles south-west of Hampstead, can have mastic renewed between lettings. If you’re responsible for a building such as St John-at-Hampstead church, frame and door mastic needs the same attention as any other property.
Hampstead is about 3 miles north-west of City of Westminster, in Greater London. Across the NW3 postcode area, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. Across Greater London, 764 places are covered, including Hampstead.
Work on mastic joints is covered throughout NW3, NW6, NW11 and N2, whatever the building. Streets here include Hampstead High Street, New End Square and The Mount Square. Being close to the A1 and A502, Hampstead is straightforward for us to reach. If your building is just outside Hampstead, we cover Greenhill (1 mile north-east), West Hampstead (1 mile west), Fortune Green (1 mile west), Vale of Health (1 mile north) and South Hampstead (1 mile south). Nearby towns on our patch include London (5 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (3 miles south-east) and Shoreditch (5 miles south-east). Hampstead ranks among the main centres of Greater London, with offices, shops, schools and other public and commercial buildings, and we cover them all.
Local landmarks in Hampstead
We work on buildings around South Hampstead High School, Kilburn Grange Park and St Anthony's Preparatory School and the streets around them. Other local landmarks include King William IV Public House (under half a mile north-east) and Cecil Sharp House (1.7 miles south-east). Hampstead has its own railway station: Finchley Road & Frognal station. Other landmarks nearby include Isokon Gallery (0.8 miles east) and New End Hospital (less than half a mile north). The countryside around Hampstead includes Belsize Wood and The Long Water.
Nearby places to Hampstead
What else we do in Hampstead
Questions about Hampstead
Do you work in London buildings with loading restrictions?
Yes. Inductions, permits and timed loading are routine for us in London. The building manager’s rules go straight into our method. All of Greater London is inside the ULEZ, and our planning allows for it
Will you take on work at estates like The Quadrant Business Centre, close to Hampstead?
Yes. Estates, retail parks and business parks around Hampstead, The Quadrant Business Centre among them, are all within reach. Send details of the unit and the work through our quote form for a quick quote.
Do you supply RAMS and insurance details?
Let us know your requirements: tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we’ll confirm with the quote. We hold CHAS accreditation and Constructionline membership.
How do I request a quote?
There are four steps: send details, receive a fixed quote, we carry out the work, and it’s guaranteed. The first step only needs photographs and a postcode.
Will you quote for a small job?
We quote for single jobs as well as large packages and programmes. Send details for a fixed quote.
How long before the joints can be used?
We’ll confirm how long the chosen product needs to cure.
Does weather matter for sealant work?
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.