How Long Does Recladding Take

Recladding a high-rise building is a complex engineering undertaking that involves far more than simply swapping exterior panels. For building owners and managing agents in the UK, understanding the cladding remediation timeline is critical for financial planning, insurance compliance, and resident communication. While every project is unique, a full-scale recladding programme for a medium-to-high-rise block typically takes between 12 and 36 months from the initial survey to the final sign-off.

This duration is split into two distinct phases: the pre-construction phase (design, procurement, and legal) and the construction phase (site setup and physical works). In many cases, the administrative and technical preparation takes as long as, if not longer than, the actual time spent on the scaffolding. Factors such as building height, occupancy status, material lead times, and the discovery of underlying structural issues all play a role in determining the final recladding project duration.

Key Takeaways#

• Typical Timescale: Most major recladding projects in the UK take 18 to 24 months to complete, though smaller remediations may be faster.
• Pre-Construction is Critical: Assessment, fire engineering, and planning can take 6 to 12 months before a single panel is removed.
• Phased Delivery: Large apartment blocks are often remediated in phases to manage resident safety and logistics.
• Regulatory Compliance: Navigating the Building Safety Act and securing funding (such as the Building Safety Fund) adds significant time to the cladding replacement timescale.
• Weather & Logistics: External works are highly susceptible to UK weather conditions and global supply chain delays for specific materials like aluminium or stone.

Defining the Recladding Timeline#

When asking how long does recladding take, it is important to define what "taking" means. Is it the time workers are on-site, or the total time since the building was identified as having a fire-safety defect? For a professional cladding testing and remediation firm, the timeline starts the moment a defect is suspected.

The cladding remediation timeline generally follows a four-stage process:
1. Investigation and Report: (1–3 months)
2. Design and Tendering: (4–8 months)
3. Mobilisation and Site Setup: (1–2 months)
4. Physical Remediation Works: (6–24 months, depending on building scale).

Phase 1: The Investigation Stage#

Before any physical work begins, a thorough technical assessment is required. This isn't just a visual check; it involves intrusive surveys where samples of the cladding system—including insulation, cavity barriers, and fixings—are removed and analysed. This is the stage where we determine if a full replacement is necessary or if targeted repairs are viable.

If the building requires an EWS1 (External Wall System) form for valuation or insurance purposes, this investigative stage is non-negotiable. The findings of these reports dictate the scope of work, which is the single biggest variable in the recladding project duration. A building requiring only cavity barrier replacement will have a much shorter timeline than one requiring a full strip-back to the structural slab.

How Long Do Cladding Works Take on Different Building Types?#

The type of building and the original materials used significantly impact the speed of the project. A low-rise office block with easy access will naturally progress faster than a 20-storey residential tower in a congested city centre.

High-Rise Residential Blocks (18m+)#

For buildings over 18 metres (or 7 storeys), the complexity increases due to stricter fire safety regulations and the need for more substantial access equipment like mast climbers or integrated scaffolding. For these structures, how long to wait for recladding on flats often depends on the sequencing of the work. We typically estimate 12 to 24 months for the physical construction phase for a standard high-rise block.

Commercial and Industrial Buildings#

Commercial projects often move faster because they are frequently unoccupied at night or can be vacated more easily than residential homes. If the building is a steel-framed warehouse or a retail park, the cladding replacement timescale might be as short as 4 to 8 months, provided the structural substrate is in good condition.

Replacing Dangerous Stone or Masonry Cladding#

One common question we encounter is how long does it take to replace dangerous stone cladding? Stone systems are significantly heavier than aluminium composite materials (ACM). Replacing them requires careful structural calculations to ensure the new system (or the repaired fixings) can safely bear the load. Due to the weight and the precision required in masonry work, these projects often take 20-30% longer than lightweight metal recladding projects.

Factors That Influence the Recladding Project Duration#

Several variables can either accelerate or delay a remediation programme. Professionals must account for these during the initial programming stage to provide realistic expectations to leaseholders and stakeholders.

1. Access Requirements and Logistics#

How we get to the cladding determines how fast we can change it. Scaffolding is time-consuming to erect and strike but allows multiple teams to work on different elevations simultaneously. Mast climbers are faster to install but can limit the number of technicians working at one height. In dense urban areas like London or Manchester, obtaining pavement licences and managing crane lifts can add weeks to the cladding remediation timeline.

2. Occupancy Status#

Working on an occupied residential building is significantly slower than working on a vacant site. Safety protocols must be maintained to protect residents from noise, dust, and falling debris. Furthermore, internal access may be required to check fire stopping around windows or balconies, which relies on resident cooperation. Coordinating these "internal-external" interfaces is a major factor in how long cladding works take.

3. Material Availability and Lead Times#

The UK construction market has seen significant fluctuations in material lead times. Specialist non-combustible A1 or A2-rated panels, specific fire-rated mineral wool insulation, and bespoke flashings can have lead times of 12 to 20 weeks. If these are not ordered well in advance of the site start date, the project can stall before it has even begun.

4. Discovery of Unforeseen Defects#

Once the "skin" of the building is removed, we occasionally find that the underlying structure—be it light-gauge steel framing (LGSF), timber, or masonry—has suffered from water ingress or poor original installation. Remediating the substrate before the new cladding can be installed is a common cause of extensions to the recladding project duration.

The Pre-Construction Phase: Why the Wait?#

For many residents, it feels like nothing is happening for months. However, the pre-construction phase is where the success of the project is determined. Building owners often ask how long to wait for recladding on flats to even start, and the answer usually lies in the legal and financial framework.

Securing Funding and Legal Tendering#

If the project is being funded via the Building Safety Fund (BSF) or the Cladding Safety Scheme (CSS), the application process involves rigorous technical reviews. This can add 6 to 12 months to the total timeline. Once funding is "in principle" secured, the project must be tendered to competent contractors, followed by a period of due diligence and contract negotiation (JCT or NEC contracts).

Design and Fire Engineering#

Recladding is not a "like-for-like" replacement. The new system must be designed to meet current Building Regulations (Approved Document B). This involves creating detailed drawings of every junction, window reveal, and cavity barrier location. A Fire Engineer must then review and sign off on these designs to ensure the building will be safe and insurable upon completion. This design cycle usually takes 3 to 5 months.

Detailed Breakdown of Site Works#

Once the contractors are on-site, the work follows a logical sequence. Understanding this sequence helps in visualising how long cladding works take on a daily and monthly basis.

• Site Establishment (Weeks 1–4): Setting up welfare facilities, hoarding, and initial access equipment.
• Removal of Existing Cladding (Months 2–5): The systematic stripping of the old panels and insulation. This is often done in sections to ensure the building remains weather-tight.
• Substrate Preparation (Months 4–7): Checking the rails, fixing brackets, and the structural wall. Installing new vapour membranes if required.
• Installation of Fire Cavity Barriers (Months 5–10): A critical safety step that must be inspected and photographed for the "Golden Thread" of information.
• Installation of New Panels (Months 6–18): Fitting the new compliant cladding, typically starting from the bottom and working up, or vice-versa depending on the access system.
• Final Testing and Commissioning (Final 2 Months): Sealant application, removal of scaffolding, and final inspections by Building Control and Fire Engineers.

Common Challenges That Delay Recladding#

Transparency regarding risks is a core part of the Cladding Testing ethos. We believe building owners should be aware of common "bottlenecks":

Weather Limitations#

High winds are the primary enemy of cladding projects. If wind speeds exceed safe limits, mast climbers cannot operate, and panels cannot be lifted. In the UK, we typically allow for a certain percentage of "weather days" in our schedules, but an unusually wet or windy winter can push a cladding remediation timeline back by several weeks.

Complex Interface Details#

Where the cladding meets windows, roofs, or balconies, the work becomes much slower. These interfaces require bespoke flashings and precise sealing to prevent future water ingress. If a building has 200 balconies, and each takes two days to remediate, that is a significant portion of the programme dedicated solely to interfaces.

The Role of Phased Remediation#

On very large estates or multi-block developments, we often recommend a phased approach. Rather than surrounding the entire building in scaffolding at once, we move from one elevation or block to the next. While this might slightly extend the total recladding project duration, it reduces the immediate impact on all residents and allows for better cash flow management and quality control. Each phase provides "lessons learned" that can speed up the subsequent phases.

Is Repair Faster Than Replacement?#

In some instances, a full reclad isn't the only option. Following a detailed cladding inspection, we may find that only the cavity barriers are missing or that only specific panels (such as those around exit routes) need replacing. Cladding remediation of this nature can often be completed in 3 to 6 months, significantly reducing both the cost and the disruption to the building's occupants.

Frequently Asked Questions#

How long does the EWS1 process take before recladding?#

The EWS1 (External Wall System) survey and subsequent report typically take 4 to 8 weeks. However, if the survey identifies a need for remediation (a B2 rating), the process of moving from that report to starting on-site can take 12 months due to design and funding requirements.

Can we stay in the building during recladding works?#

Yes, in the vast majority of cases, residents remain in their homes. The works are external, though there will be significant noise and a loss of natural light due to scaffolding and debris netting. The cladding remediation timeline is structured to minimise the time any single window is obscured.

Why does it take so long to replace stone cladding compared to metal?#

When asking how long does it take to replace dangerous stone cladding, the answer lies in the weight and the fixing method. Stone panels are heavy and often require mechanical hoists for every single unit. They also require more substantial rail systems and more frequent inspections to ensure the structural integrity of the fixings.

Does the height of the building significantly change the timeline?#

Absolutely. Buildings over 18 metres fall under the Higher-Risk Building (HRB) regime in the UK, requiring more rigorous approvals from the Building Safety Regulator (BSR). The logistical challenge of moving materials 20 storeys up also means that how long cladding works take increases exponentially with height.

What is the "Golden Thread" and does it slow down the project?#

The Golden Thread is a digital record of the building's design, construction, and management. While it requires more administrative work during the project—such as photographing every cavity barrier before it is covered—it actually prevents delays at the end of the project by ensuring all documentation is ready for Building Control sign-off.

How much notice do residents need before recladding starts?#

We recommend starting the communication process at least 3 to 6 months before site mobilisation. Formal notices regarding scaffolding, parking restrictions, and privacy (netting) help manage expectations and can actually speed up the project by reducing resident-related delays on-site.

Can recladding be done in the winter?#

Yes, work continues through the winter, but it is typically slower. Short daylight hours and increased wind/rain mean that productivity is lower than in the summer months. We account for this when calculating the cladding replacement timescale during the planning phase.

Navigating the Path Forward#

The question of how long does recladding take is best answered through a building-specific assessment. There are no shortcuts to safety; a rushed recladding project often leads to quality defects that require further remediation down the line. By following a structured approach—investigation, design, procurement, and phased construction—building owners can ensure their properties are returned to a safe, compliant, and insurable state.

If you are managing a building with potential cladding defects, the first step is to establish exactly what is behind the facade. Whether the solution is a targeted repair or a complete replacement, having a technically competent team to map out the cladding remediation timeline is essential for a successful outcome. At CladdingTesting.com, we provide the clarity needed to move from uncertainty to completion.