The result
A contractor needed a robust way to demonstrate as‑built fabric performance at handover, not just rely on design assumptions and visual checks.
ATSPACE delivered Smart HTC verification on a representative sample of completed plots, providing measured evidence of heat‑loss behaviour.
The results were summarised in a handover‑ready format, with practical recommendations that helped the client tighten build consistency across remaining plots and reduce performance‑gap risk.
Project snapshot
Service: Smart HTC verification
Client: Main contractor (mixed‑tenure housing scheme)
Site: Kingsbrook Lane, Phase 2, Plots 41–44, Aylesbury HP18 0FD
Building type: 2‑storey houses — detached + semi‑detached
Construction: Masonry cavity wall, insulated slab, warm roof, high‑performance glazing, MEV/MVHR mix
Programme stage: Rolling handover
Client objective: Evidence‑based fabric performance and a repeatable QA benchmark
ATSPACE delivery: Smart HTC testing on selected plots, results summary, trend notes, close‑out recommendations
Team: ATSPACE building performance engineer + compliance coordinator
Why the client wanted verification — not assumptions
The client’s goal was not to “find faults” but to:
- prove the homes perform as delivered
- reduce risk of performance‑gap claims
- benchmark plot‑type consistency
- create a repeatable quality process that withstands programme pressure
Smart HTC verification was chosen because it provides measured heat‑loss evidence that can be explained simply at handover.
How ATSPACE structured the verification programme
Step 1: Select representative plots
A sample was chosen to reflect:
- main house types
- different construction details
- any higher‑risk junction patterns
Step 2: Apply consistent test‑readiness rules
To make results comparable, every plot had to meet the same readiness criteria:
- dwelling complete and stable
- services commissioned and running correctly
- openings/interfaces in final condition
- no ongoing works that would distort heat‑loss behaviour
Step 3: Smart HTC measurement and context recording
Testing was carried out with clear documentation of operating conditions to ensure the data could be interpreted reliably.
Step 4: Produce a handover‑ready summary
The client wanted clarity, not technical overload.
ATSPACE delivered:
- plot‑level results
- comparison to design expectations
- trend notes across house types
- practical recommendations where performance drift appeared
What the verification achieved
Outcome 1: Performance consistency proven
Multiple plots demonstrated HTC values in line with design intent, giving confidence that workmanship and processes were effective.
Outcome 2: Early warning of performance drift
One house type showed minor deviation aligning with a known junction risk.
The team intervened on remaining plots before the issue spread.
Outcome 3: A repeatable QA tool
The contractor gained a reliable approach to verify fabric performance in future phases.
Practical learning points that mattered most
The biggest drivers of heat‑loss consistency were the “unseen” details:
- protect service‑entry sealing and meter zones
- standardise threshold and reveal close‑out
- treat loft hatches and ceiling penetrations as performance‑critical
- maintain continuity at slab‑edge and wall‑base junctions
- avoid late penetrations without immediate resealing
These controls prevented drift and kept results tight across plots.
Common mistakes this programme avoided
- assuming fabric performance without measured evidence
- relying on a single test and hoping it represents all plots
- collecting data in inconsistent conditions
- focusing on individual trades instead of trade interfaces
- identifying drift only after multiple plots were completed
CTA
If you want measured fabric‑performance evidence at handover, ATSPACE Smart HTC verification provides a practical, explainable way to benchmark heat‑loss performance across your plots.
It supports quality assurance, strengthens handover packs and reduces performance‑gap risk.
Ask for:
- Smart HTC verification on representative plot samples
- plot‑level results + house‑type trend summaries
- practical close‑out recommendations to improve consistency
- support aligning fabric‑performance checks with handover
Frequently asked questions
What does Smart HTC verification add at handover?
Measured evidence of as‑built heat‑loss behaviour — moving from assumption to proof.
How many plots should be tested?
A representative sample is usually enough to benchmark performance and identify drift early.
Can Smart HTC help identify where performance is being lost?
Yes — it highlights performance drift, and combined with on‑site investigation, it helps pinpoint the most likely weak interfaces.
