Passivhaus in Practice: Why Early Decisions Define Delivery Success

The delivery of two affordable Passivhaus schemes in Harpurhey, Parkmount Road and Princedom Street, offers a valuable lens into the realities of delivering high-performance housing at scale.

While both schemes achieved strong cost certainty, the journey to completion highlights a critical truth: Passivhaus is not simply a specification; it is a commitment that must be embedded from the outset.

Across both developments, Poole Dick acted as Employer’s Agent and Quantity Surveyor, working alongside John Southworth Builders and AEW Architects, with GWP Architects supporting on Princedom Street. The schemes delivered 46 affordable homes built to Passivhaus standards, an ambitious brief with clear long-term benefits for residents.

“Too often, Passivhaus is approached as an enhancement rather than a foundation. Our experience shows that unless it is embedded from the very beginning, projects will encounter avoidable challenges during delivery.”
Andrew Bayley, Director, Poole Dick

From a cost perspective, both projects performed exceptionally well. Final accounts aligned almost exactly with contract sums, demonstrating robust commercial management and disciplined cost control. However, programme performance told a different story. Parkmount Road extended from a planned 52 weeks to 103 weeks, while Princedom Street moved from 60 to 73 weeks.

“Cost certainty is achievable, even on complex schemes, but programme certainty is far more dependent on early coordination and decision-making. That is where the real difference is made.”
Martin Brownsill, Managing Director, Poole Dick

This divergence between cost and programme reinforces a key lesson: late-stage alignment creates early-stage risk. On both schemes, the contractor was appointed post-planning. While this is a familiar procurement route, it limited early contractor input into design development, particularly critical on a technically demanding standard such as Passivhaus. The result was a need to resolve buildability, sequencing, and detailing challenges during delivery rather than design.

“Early contractor involvement is not just beneficial on Passivhaus schemes, it is essential. It allows the whole team to align around buildability, cost, and performance before those pressures hit on site.”
Andrew Bayley, Director, Poole Dick

The takeaway is clear. Passivhaus decisions must be made at RIBA Stage 1, not retrofitted into developed designs. Early contractor engagement allows the design team to balance performance targets with practical construction methodologies, reducing rework, delays, and inefficiencies
later in the programme.

Luke Taylor reflects on the experience:

“Looking back, one of the biggest lessons was the value of bringing construction expertise into the conversation as early as possible. Many of the challenges encountered during delivery could have been identified and resolved much earlier through collaborative planning.”

This approach is becoming increasingly important in the context of the Future Homes Standard and the Greater Manchester Combined Authority Modern Methods of Construction design guidance, both of which reinforce the need for early-stage alignment between design intent, buildability, and delivery strategy.