Stage Advice Letters: Purpose and Requirements

A Stage Advice Letter is a formal document that captures the retrofit advice and decisions made at each defined stage of a property improvement project. In PAS2035-compliant retrofit work, these letters form a critical part of project documentation, creating a clear audit trail and ensuring that all parties—including the building owner, retrofit coordinator, surveyors and installers—are working from the same technical foundation.

Why Stage Advice Letters Matter

Stage Advice Letters serve several essential functions in retrofit project delivery:

• Documented decision-making: They record what was recommended, why, and what the client agreed to pursue
• Scope clarity: They define the retrofit scope at each stage, reducing scope creep and disputes
• Compliance evidence: They demonstrate that PAS2035 processes have been followed correctly
• Risk management: They protect all parties by creating a clear record of advice given and accepted
• Handover documentation: They support the building owner with evidence of the retrofit decisions for future reference

The Retrofit Stages and Their Advice Letters

PAS2035 defines several project stages, each of which should be supported by appropriate advice letters:

Stage 1: Initial Assessment and Recommendations

This letter follows the initial survey and assessment. It should include:

• Summary of the building's current performance and condition
• Identification of retrofit options considered
• Technical recommendations for the preferred retrofit route
• Why certain options were rejected or not pursued
• Preliminary cost and performance estimates
• Any risks or limitations identified during assessment

Stage 2: Detailed Design Development

Once the client has approved the initial recommendations, a second letter should confirm:

• Detailed technical specifications for recommended measures
• Performance modelling outcomes (energy savings, carbon reduction, comfort improvements)
• How the design addresses identified building-specific constraints
• Any design revisions made in response to client feedback
• Confirmation of compliance with relevant building regulations and standards

Stage 3: Pre-Installation Advice

Before installation commences, a final stage letter should document:

• Confirmation of final scope and specifications
• Installation methodology and sequencing
• Any site-specific adaptations to the design
• Roles and responsibilities during installation
• Arrangements for quality assurance and testing

Essential Content Requirements

Regardless of stage, all Stage Advice Letters should contain:

1. Clear client identification: Property address, owner details and unique project reference
2. Date and version control: Issue date and revision numbers if the letter is updated
3. Scope statement: What measures and areas are included or excluded
4. Technical detail: Sufficient information for other professionals to understand and implement the advice
5. Building performance context: How recommendations link to the building's current condition and performance baseline
6. Risk and limitation notes: Any uncertainties or constraints that informed the recommendations
7. Client acknowledgement: Space for the building owner or their representative to confirm receipt and acceptance
8. Professional sign-off: Signature, name and credentials of the surveyor or retrofit coordinator issuing the letter

Common Pitfalls to Avoid

When preparing Stage Advice Letters, watch for these common issues:

• Vague recommendations: Avoid generic advice that could apply to any building. Be specific to the property and its circumstances
• Missing rationale: Always explain why you have made specific recommendations and ruled out alternatives
• Insufficient technical detail: Provide enough information that installers and other professionals can act on the advice without needing to chase clarification
• Failure to acknowledge constraints: Be transparent about building-specific challenges, cost trade-offs or performance limitations
• No client confirmation: Ensure the building owner has actually reviewed and accepted the recommendations, not just received them passively

Integration with Project Delivery

Stage Advice Letters should be issued at planned project gates and should trigger formal client decision points. Before work progresses to the next stage, the client should have reviewed and accepted the advice in writing. This creates a clear contractual and technical foundation for the subsequent work.

The letters also provide an essential reference point for installers and quality assurance teams. Each letter should be shared with all parties who need to understand the retrofit strategy, and retained throughout the project and beyond.

Retention and Handover

Stage Advice Letters form part of the mandatory project documentation that must be provided to the building owner on completion. They should be retained for at least 7-10 years and provided to the client in a clear, indexed format alongside other project records such as test certificates, commissioning reports and warranties.

These documents have long-term value: they help future owners and occupants understand the retrofit decisions and may inform future upgrade planning.