Construction and new-build mastic in Dulwich, Greater London
Construction mastic for Dulwich, from a contractor working since 2005. Fully insured and CHAS accredited.
- Mastic snags holding up handover
- Internal caulk splitting as the building dries out
- Failed sealant in an existing building being refurbished
Construction mastic in Dulwich
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
About our construction mastic in Dulwich
Buyers, tenants and clients notice sealant lines long before they notice the structure. Untidy or missed joints are among the commonest snag items. Our aim is joints that pass at the first inspection, area by area through the programme. If you’re dealing with different trades sealing to different standards and window and door perimeters that won’t pass inspection, we can put it right, whatever the surface. Looking for mastic applicators who cover Dulwich? Mastic Doctor has worked for contractors, FMs and building owners since 2005, CHAS accredited and a Constructionline member.
Every London site, Dulwich included, is inside the ULEZ, which applies to deliveries and contractors’ vans alike. Add booked delivery slots and limited storage, and a London mastic package needs planning before the first bead.
Building owners and contractors get the same cover: 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
- Dulwich (SE22, SE21, SE23)
- Wider area
- Greater London
- Cover
- A 12-month guarantee
- Price
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
What sealant work can’t fix
Part of a good diagnosis is knowing where sealant stops. You will hear from us if the cause turns out to be one of these:
- Frame gaps too wide for sealant, which the installer needs to correct
- Damage to finishes by other trades after we have sealed
- Approving fire stopping as compliant
If you’re not sure, just speak to us on 01277 525 020 or send photos by email and we will give you a straight answer before you book.
Where we work in Dulwich
- Cladding and panel joints
- Sanitary and kitchen joints
- Brick and block movement joints
- Floor and skirting junctions
- Internal decorators’ caulk
- Window and door perimeters
Questions we are asked in Dulwich
Do you take on work at healthcare sites like Maudsley Hospital?
Yes. Healthcare sites are among the places we work. Each area is agreed with the ward or department and the estates team in advance.
Does your area include sites such as Goose Green Trading Estate, near Dulwich?
Yes, sites like Goose Green Trading Estate are within our area, along with the rest of Dulwich. A few photographs and the unit address let us price the work.
Does the weather affect the work?
It can, when the joints are outside. Wet joints and cold, damp or frosty conditions stop the sealant bonding properly, so we watch the forecast and rearrange outside work if we have to. Internal work is far less affected.
Do your applicators hold CSCS cards?
We are CHAS accredited and a Constructionline member, and our applicators hold CSCS cards. Public liability insurance is in place.
Can you fit around our working hours?
Give us your site hours and any access windows in your enquiry, and we’ll schedule the work to suit. You can reach the office between 8am and 5pm, Monday to Friday.
Can you work while the building is occupied?
In the majority of cases, yes. We phase the work so most of the building stays in use.
Do you do fire-rated sealing on new builds?
Fire-rated sealing at service penetrations and linear gaps can be included where specified. Record requirements are confirmed at quote stage.
Facades, frames and programmes in Dulwich
The area within 2 miles of Dulwich holds a number of hotels. Hotel schemes tend to have fixed reopening dates, so the mastic is programmed tightly with the other trades. Site traffic in Dulwich falls within London’s ULEZ, like everywhere else in Greater London. Add booked deliveries and tight storage, and the mastic package needs planning with the site team.
New units and refits on sites such as Goose Green Trading Estate (1 mile north of Dulwich) need their panel and perimeter joints sealed to the specification. Hotel extensions and refits, at places such as Astra Palace Hotel (1.3 miles south of Dulwich), typically run between busy periods, so the sealing is squeezed into short windows.
Dulwich is about 1 mile south-east of Herne Hill, in Greater London. We cover Dulwich, with the same fixed quotes and 12-month guarantee as everywhere else. Our Greater London coverage takes in 764 places, large and small.
We take on mastic packages across the SE22, SE21 and SE23 postcode area, for business premises of every kind. Streets here include Court Lane, Druce Road and Boxall Road. You will find Dulwich on or near the A2216, so getting applicators and materials to site is simple. Sites close to Dulwich are covered too, including Dulwich Village (1 mile north-west), West Dulwich (1 mile south), Herne Hill (1 mile north-west), Sydenham Hill (1 mile south-east) and Forest Hill (1 mile east). Bigger towns within reach include London (4 miles north), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles north-west), St Pancras (6 miles north) and Shoreditch (6 miles north).
Landmarks near Dulwich
We work on buildings around The Crown and Greyhound pub, Dulwich Park and Alleyn's School, among other places. Dulwich’s nearest station is West Dulwich station, about 0.7 miles south-west. A little further out are Dulwich Community Hospital (0.9 miles north) and Greenwich Castle (4 miles north-east). Open spaces near Dulwich include Knight's Hill and Centre for Wildlife Gardening.
Places near Dulwich
What else we do in Dulwich
Keeping the joints sound
To get the most from the new sealant:
- Use the product the specification names
- Check frame gaps are within the sealant’s range before sealing
- Brief the final clean team to avoid blades near sealant
- Plan external elevations with the weather in mind
Brief the sparkle clean so they don’t scrape the new joints. Scrapers used on frames and worktops can nick or lift a new bead so keep them off the joints.
Oversized gaps are a problem better caught early. Sealant stretched over an oversized gap won’t last so packing or adjustment by the installer comes first. We raise them during our first walk of the area.
How the quote is worked out
There’s no standard rate for sealant work, because every site is different. What we look at:
- Phasing around occupants
- Which sealant the job calls for
- Any access equipment needed
- Removal of failed or old sealant
Small jobs and large programmes are priced from the same things: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote and we’ll put a fixed figure on it.
Details that help us quote
The more we know, the firmer the quote. Helpful details to send:
- A wide shot and a close-up of the area
- Access details, including height
- The site address and postcode
- Any dates the work must fit around
If there’s a specification, drawings or a tender package, send it with your enquiry, and we’ll price the work to it. For smaller jobs, photos and a description will do.
What we are called out for in Dulwich
Value-engineered products sometimes end up in the wrong joints. A sealant that isn’t right for the substrate or the movement will fail ahead of time. We use what’s specified, and any substitute goes to you for acceptance.
Site and facilities staff are often the first to spot these:
- Missed perimeter joints on a new elevation
- External joints sealed in damp or cold conditions that are now failing
- Perimeter gaps outside the sealant’s range
- Mastic snags holding up handover
Building work at universities like King's College London (1.7 miles north of Dulwich) is often timed for the summer, mastic included.
Before you book anyone
- Will failed sealant be removed rather than covered?
- Their plan for phasing and protecting the area
- How the joint faces will be prepared and primed
- How joint depth will be controlled
Our process
We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. Once we’re cleared to begin, the joints are worked through in the order agreed with your site contact. The ULEZ covers the whole of Greater London, and parking near a job is rarely simple. Let us know about any on-site parking or loading arrangements when you send the job details.
- Drawings, specification and programme come to us.
- We take off quantities and return a fixed quote.
- The sequence is agreed with the site manager.
- Each area is sealed when it’s released.
- Every joint is cleaned, set to depth and sealed with the specified product.
- After snagging, the work is handed over under our 12-month guarantee.
What we need from you
- Point out parking and an unloading spot
- Tell us what induction or permit system the site runs
- For older buildings, check the asbestos register before work
Getting 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 email drawings and photos.
Related advice
When to bring in a specialist
Some joints are best left to specialists: for example fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. A poor seal in places like these tends to cost more to put right later.
Using site staff can make sense for a small touch-up, but larger jobs are different: a specialist brings efficiency, a consistent finish and a 12-month guarantee.