Construction Mastic in Crayford
We carry out mastic packages for new-build and refurbishment projects in Crayford. Send details for a fixed quote.
- Caulk cracking where joints are moving more than expected
- Window and door perimeters that won’t pass inspection
- Old sealant on a refurbishment that needs stripping before new work
Construction mastic for businesses in Crayford
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
What we can’t put right
Honesty saves time and money. Fresh joints won’t solve:
- Oversized gaps that need packing or adjustment by others
- Damage to finishes by other trades after we’ve sealed
- Deciding which fire-stopping product a penetration needs
If you’re not sure, just call the office on 01277 525 020 or email the details over and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Brick and block movement joints
- Sanitary and kitchen joints
- Floor and skirting junctions
- Cladding and panel joints
- Internal decorators’ caulk
- Window and door perimeters
Construction mastic for commercial buildings in Crayford
Mastic follows everyone else, which means it absorbs every delay upstream. We agree a sequence at the start and adjust it as the site manager releases areas. Sealing too early only means coming back once others have damaged it. If you’re dealing with external joints sealed in damp or cold conditions that are now failing and window and door perimeters that won’t pass inspection, we can put it right. Looking for mastic applicators who cover Crayford? Mastic Doctor has worked for contractors, FMs and building owners since 2005.
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.
We stand by our work: 12 months, guaranteed. It covers how we prepared and applied the sealant, and we come back if anything isn’t right.
- Where
- Crayford (DA1, DA5, DA7)
- Region
- Greater London
- Guarantee
- A 12-month guarantee
- Quotes
- Quoted before any work starts
- Call
- 01277 525 020
- Page updated
- 3 November 2026
Surface by surface
Bathrooms, en suites and washrooms
Sanitary joints around baths, showers, basins and WCs need anti-mould sanitary silicone. Joints are cleaned, sealed and tooled neatly.
Window and door perimeters
Perimeter joints between frames and the structure are the weather line on any new building. We use the specified perimeter sealant, usually a low-modulus neutral-cure silicone, with backing rod in deeper gaps.
On site: what to expect
Working in a building that stays open takes some planning. The work area is signed and kept contained, with routes through the building left open and work section by section so the rest of the building stays in use. Most London premises stay occupied while we are on site, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.
- Drawings, specification and programme come to us.
- Quantities are measured and a fixed price returned.
- 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.
- Snags are cleared and the package signed off with our 12-month guarantee.
What we need from you
- Arrange parking or a loading space
- Let building users know which areas are affected
- Tell us which areas need to stay in use
Request a quote
Need a figure for a tender or a budget? We will quote against your scope and drawings that you can work with. If you have questions first, call the office on 01277 525 020 or email us.
Read more
Cost factors for mastic packages
We price every job individually. The things that drive the figure:
- The product specified
- How much there is to seal
- The size and state of each joint
- How accessible the joints are
A quote for mastic packages depends on quantities, condition and access. Call for a quote.
What to include in your enquiry
A few photographs plus some basic facts will normally do. It helps to include:
- Asbestos survey details if the building is older
- Any dates the work must fit around
- Access details, including height
- Clear photographs of the problem areas
Tell us about the building, the joints and when you need the work done, and we’ll put a fixed quote together. The easiest way is to phone 01277 525 020 or email us.
What happens if it’s left?
On a refurbishment, there’s a choice between resealing existing frames and replacing them. Sound frames often need only a new perimeter seal and that’s a far smaller job. We’ll say so if a frame itself is the problem. In Crayford, each extra visit means more notices, permits and disruption, so cutting the old sealant out fully and doing it right once is the better route.
The price depends on the quantity of joints, what has to come out first and the access. Call for a quote once you have the details.
Why choose Mastic Doctor in Crayford
- CHAS accredited
- 12 months’ guarantee on every job
- Our applicators hold CSCS cards
- Fully insured, including public liability cover
Read how commercial sealant jobs are priced and our accreditations and insurance.
Your questions answered
Can work at a site such as University of Greenwich fit around teaching?
Yes. Tell us the term dates, vacation periods and access windows, and we will plan the work around them. Let us know which documents your site asks for, and we’ll confirm them alongside the quote.
Can you take on a job at a hospital such as Erith and District Hospital?
Yes. We work in healthcare settings as well as offices and schools. We follow the site’s permits, sign-in and infection-control procedures in every area.
What will the job cost?
There isn’t a price list, because every site is different. With photos or drawings, we can give you a fixed quote.
Can you work to our specification?
We work to the specification and the manufacturer’s installation guidance. Primers, backing and joint depth follow what the manufacturer sets out.
Are you insured?
Yes. Mastic Doctor is fully insured, public liability included.
Is colour matching possible?
Often, yes. Many products come in a range of standard colours, and matching to RAL references or surrounding finishes is often possible. We confirm what’s available for the specified product when we quote.
Is it fine to apply new sealant on top of old?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, because fresh silicone will not bond with aged silicone.
Building owners, agents and FMs in Crayford
Hotels, schools, healthcare sites, offices and retail units book us directly too. We plan around the way the building is used, so guests, pupils, patients or staff are disturbed as little as possible.
CHAS accredited and a Constructionline member, we make supplier vetting simple. We are fully insured, and our insurance certificate can go with the quote.
Sites and facades in and around Crayford
Crayford has a number of hotels close by, all within 2 miles. When hotels extend or refit, the work is typically squeezed between peak periods, mastic included. Every borough of Greater London is inside the ULEZ, and that applies to contractors’ vehicles on any job in Crayford. London sites also mean booked deliveries and limited storage, which the mastic programme has to allow for.
New units and refits on sites such as Tower Retail Park, under half a mile north of Crayford, need their panel and perimeter joints sealed to the specification. On a campus such as University of Greenwich (3.8 miles east of Crayford), new teaching buildings and residences are usually built and refurbished around the academic year. When a college such as North Kent College, 1.5 miles south-east of Crayford, builds or refurbishes, the mastic package usually has to fit around students and staff.
Crayford is about 2 miles west of Dartford, in Greater London. Looking for construction mastic in Crayford? We can help, as we do across Greater London. 764 places across Greater London fall within our area, including Crayford. London is covered too, around 12 miles from Crayford.
If you need construction mastic in DA1, DA5 and DA7, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. Buildings on Swan Lane, Dale Road and Ross Road are within our area for mastic packages. We also cover Bowmans (1 mile south), Barnes Cray (1 mile north-east), Barnehurst (1 mile north-west), Coldblow (1 mile south-west) and Wilmington (1 mile south). A short drive away, we cover London (12 miles west), City of Westminster (15 miles west), Marylebone (15 miles west), St Pancras (14 miles west), Shoreditch (12 miles north-west) and Walthamstow (13 miles north-west).
Around Crayford
Around Crayford, our work takes us to commercial buildings near The Bear and Ragged Staff pub, Braeburn Park and St Catherine's Catholic School, among other places. There’s a railway station in Crayford itself: Crayford station. Well-known places in the area include Broadway Shopping Centre (1.6 miles west) and West Hill Hospital (1.3 miles east). Green spaces nearby include Wansunt Pit.