Our NTHAS assessments and repair schemes provide expert support for councils, housing associations and landlords managing non-traditional properties constructed using pre-1970 systems, including Airey, Wimpey No-Fines, Cornish, Tarran, BISF and other PRC and non-PRC forms of construction.
Through detailed assessment and the application of NTHAS-approved repair solutions, we help landlords understand the condition, risks and long-term viability of non-traditional homes, enabling safe retention, refurbishment or informed strategic decisions.
What Is NTHAS?
The Non-Traditional Housing Appraisal Scheme (NTHAS) is an industry-recognised framework for assessing the condition and durability of non-traditional housing systems. It provides a structured method for identifying inherent defects, assessing risk and determining whether properties are suitable for repair, continued use or alternative intervention.
NTHAS assessments are widely relied upon by local authorities, housing associations, valuers, lenders and regulators to support asset management decisions and repair strategies.
Why NTHAS Assessments Are Important
Non-traditional homes often have construction-specific weaknesses that may not be evident through standard surveys. NTHAS assessments provide clarity on:
- Structural integrity and durability
- Performance of original materials and components
- Risks associated with concrete deterioration or corrosion
- Suitability for licensed or approved repair schemes
- Long-term sustainability and maintenance implications
This ensures decisions are evidence-based, auditable and defensible.
Our NTHAS Assessment Approach
We deliver comprehensive NTHAS assessments tailored to the specific non-traditional construction type:
Property Identification and Data Review
Confirmation of construction type, review of original designs, historic repairs and existing stock condition data.
On-Site Inspection and Investigation
Detailed inspection of key structural and fabric elements, supported by targeted testing where required.
Risk and Durability Assessment
Evaluation of current condition, defect progression and long-term performance in line with NTHAS methodology.
Recommendations and Repair Pathways
Clear advice on whether properties are suitable for NTHAS-approved repair schemes, continued monitoring, or alternative options such as redevelopment or disposal.
NTHAS Repair Schemes
Where properties are suitable for retention, we support the development and delivery of NTHAS-approved repair schemes, which may include:
- Structural strengthening or replacement of defective elements
- Removal or isolation of deteriorating concrete components
- Upgrading of building fabric to improve durability and performance
- Integration of compliance and energy efficiency improvements
Repair schemes are designed to extend service life, improve safety and support long-term asset sustainability.
Reporting and Deliverables
Our NTHAS service provides clear, decision-ready outputs, including:
- NTHAS assessment reports
- Identification of construction type and defects
- Repair scheme feasibility and recommendations
- Technical support for design and implementation
- Documentation suitable for asset strategies, boards, valuers and regulators
Reports are written in plain English, supported by technical evidence and practical recommendations.
Supporting Asset Management and Compliance
NTHAS assessments and repair schemes support:
- Strategic asset management planning
- Options appraisals for non-traditional housing
- Decisions on investment, retention or disposal
- Compliance with housing quality and safety standards
- Funding, valuation and mortgageability considerations
This ensures landlords have a clear, robust basis for managing non-traditional stock.
Why Work With Us?
We have extensive experience assessing and repairing non-traditional and PRC housing, including direct involvement in the development and application of NTHAS-approved repair solutions. Our advice is independent, technically robust and aligned with the practical realities of social housing management.
We help landlords reduce risk, prioritise investment and extend the life of non-traditional homes, delivering solutions that stand up to regulatory and financial scrutiny.