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Working with lime in buildings


The purpose of this standard is to provide the delegate with the knowledge and skills to support working with lime products in traditional buildings.


Minimum 5 days of 6 hours learning per day


The purpose of this standard is to provide the delegate with the knowledge and skills to support working with lime products in traditional buildings.


  • material technology
  • risks and hazards
  • personal protective equipment (PPE)
  • traditional techniques
  • repairs to fibrous plasterwork
  • tools and equipment

Occupational relevance

Training delivered against this standard would be relevant to the following occupational groups:

  • operative and craft
  • supervision
  • management and leadership

Delegate pre-requisites

There are no delegate pre-requisites as part of this standard.


As a minimum, course trainers must be able to demonstrate that, in relation to this standard, they have:

  • an award in education and training (or equivalent, as per requirements for approved training organisations)
  • successfully completed training to this standard
  • at least 5 years relevant industrial experience
  • a verifiable CV


Delivery may be in an on or off the job environment.

All materials and equipment must be of a suitable quality and quantity for delegates to achieve learning outcomes and must comply with relevant legislation.

The class size and delegate/trainer ratio must allow training to be delivered in a safe manner and enable delegates to achieve the learning outcomes.

The following delivery methods may be used in the delivery of this standard:

  • classroom
  • a blend of classroom and remote

This standard is considered to contain 51% or more practical training.

This standard is considered to be set at an intermediate level.


For the successful completion of training, delegates must complete an end of course practical assessment or knowledge test that measures all learning outcomes and has a pass or fail criteria.

Where this training is assessed using multiple-choice questions, a minimum of 10 questions must be asked and delegates are required to achieve an overall pass mark of at least 80%.

Quality assurance


Quality assurance against this standard will require initial approval of the training organisation and their content mapped to the standard.

CITB will also conduct an approval intervention, either desk-based or centre visit, to ensure the training organisation can meet the requirements of the training standard.

Approved training organisations (ATOs) will be required to present information on records of training and assessment upon request to CITB for desk-based analysis. They will also be visited annually by the CITB quality assurance team.


There are no mandatory renewal or recommended refresher requirements for this standard.



(Please note standards using this classification will only be grant aided once per delegate)

Approval date

June 2022

Review cycle

On request or 5 years from approval date

Learning outcomes

The delegate will be able to:

  • identify appropriate types of lime products including additives in order to batch mixes for different circumstances.
  • explain the lime cycle
  • describe the risks and hazards associated with working with lime in buildings
  • select and use the appropriate PPE for the work required
  • demonstrate the appropriate use of batching and mixing equipment, hand and power tools when mixing and applying lime mortars and plasters
  • demonstrate the processes for mixing and applying a range of lime mortars and plasters on varied surfaces
  • demonstrate the processes for mixing and applying standard and specialist lime mortars and plasters to produce appropriate repairs to solid and fibrous applications
  • demonstrate lime mortar repair techniques to external mouldings

Additional information about this standard

  • Swallow, Dallas, Jackson and Watt (2004) Measurement and Recording of Historic Buildings London: Donhead
  • R.Chudley (1996) Building Construction Handbook London: Laxtons
  • RD Pickard (1996) Conservation in the Built Environment Harlow Essex: Longman
  • John & Nicola Ashurst (1990) Practical Building Conservation Vol 1,3 Aldershot: Gower Technical Press