Before acting on “What wind pressure applies here”, confirm the controlling value and basis, datum where relevant, operating or construction condition, tolerance and margin, actual site information, adjoining interfaces and source document.

For “Does this façade change affect the model”, confirm model purpose, author, status, coordinates, level of development, unresolved issues and whether controlled design information still governs the construction release.

Before acting on “Can this opening move”, confirm the current design basis and reason for the change, test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, coordinate façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, and identify work already released, approvals, testing and the smallest safe hold point.

For “Is there a condensation risk”, provide the exact location and current references, state the governing criterion and decision required, identify affected interfaces and irreversible work, give a genuine need date and record the answer in controlled project information.

Before acting on “What insulation value is required”, confirm the controlling value and basis, datum where relevant, operating or construction condition, tolerance and margin, actual site information, adjoining interfaces and source document.

Before acting on “Can this thermal break change”, confirm the current design basis and reason for the change, test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, coordinate façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, and identify work already released, approvals, testing and the smallest safe hold point.

For “Does this louvre affect wind performance”, provide the exact location and current references, state the governing criterion and decision required, identify affected interfaces and irreversible work, give a genuine need date and record the answer in controlled project information.

For “Can this screen be removed”, provide the exact location and current references, state the governing criterion and decision required, identify affected interfaces and irreversible work, give a genuine need date and record the answer in controlled project information.

Before acting on “What air-leakage target applies”, confirm the controlling value and basis, datum where relevant, operating or construction condition, tolerance and margin, actual site information, adjoining interfaces and source document.

Before acting on “Can this glazing type change”, confirm the current design basis and reason for the change, test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, coordinate façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, and identify work already released, approvals, testing and the smallest safe hold point.

For “Does this bridge create a moisture risk”, provide the exact location and current references, state the governing criterion and decision required, identify affected interfaces and irreversible work, give a genuine need date and record the answer in controlled project information.

For “What pedestrian wind mitigation is required”, provide the exact location and current references, state the governing criterion and decision required, identify affected interfaces and irreversible work, give a genuine need date and record the answer in controlled project information.

Before acting on “Can this canopy reduce”, confirm the current design basis and reason for the change, test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, coordinate façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, and identify work already released, approvals, testing and the smallest safe hold point.

To close “What testing is required”, define the acceptance criterion, evidence, sample or test condition, witness point, responsible signatory, defect response and the release or handover gate.

Before accepting “Can we use an alternative insulation”, compare thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, evidence, compatibility, warranty, lead time, maintainability, interfaces and every required approval.

Before acting on “Does this mechanical change affect comfort”, confirm the current design basis and reason for the change, test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, coordinate façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, and identify work already released, approvals, testing and the smallest safe hold point.

For “What assumption must remain true”, provide the exact location and current references, state the governing criterion and decision required, identify affected interfaces and irreversible work, give a genuine need date and record the answer in controlled project information.

Before acting on “Can we reduce façade performance”, confirm the current design basis and reason for the change, test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, coordinate façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, and identify work already released, approvals, testing and the smallest safe hold point.

Before acting on “What needs re-modelling after this change”, confirm the current design basis and reason for the change, test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, coordinate façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, and identify work already released, approvals, testing and the smallest safe hold point.

To close “What is the final specialist performance requirement”, identify the controlling document and responsible owner, list every design, client, statutory, contractual and evidence gate still open, then issue one position that construction and handover can rely on.

A seemingly simple request can depend on several disciplines, the client, a certifier or a specialist trade.

They can provide a view but cannot commit the client, company, regulator or another designer.

Consultants test positions privately because the interface is shared or politically sensitive.

Trust can accelerate honest coordination; history and alliances can also distort the current decision.

The apparent delay may be an unresolved design-leadership issue rather than simple inaction.

A consultant may qualify a response instead of openly contradicting a peer.

No appointment clearly owns the missing design, coordination or evidence task.

Acceptance may extend beyond available information, competence, authority or fee.

Earlier briefs, approvals and conversations may still shape the consultant response after the delivery model changes.

Commercial pressure cannot remove duties around competence, safety, compliance and records.

A genuine site need still requires adequate facts, checking and the right signatory.

The consultant may be waiting on survey, selections, another design, client direction or trade data.

Redesign, unpaid work or changed scope can appear as a technical delay.

The people producing information may not know assumptions held by project leaders.

A small design response can disrupt sequence, fabrication, access, rework and programme.

Pressure, air leakage, condensation and thermal performance.

Wind pressures, façade orientation.

High-specification glazing, insulation, airtightness, shading and façade systems increase product and installation cost but may reduce plant, energy, condensation and comfort risk across the building.

Record climate, geometry, materials, boundary conditions, occupancy, operation, tolerances, risk criteria and sensitivity rather than publishing results without assumptions.

A practical change may affect building physics consultant performance, approvals and connected design assumptions and obligations beyond the immediate trade.

Before agreeing to “Can we reduce insulation thickness”, confirm the original demand and margin, then test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, future flexibility and acceptance evidence.

Before accepting “Can we use alternative insulation”, compare thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, evidence, compatibility, warranty, lead time, commissioning and approval status before calling it equivalent.

Before agreeing to “Can we reduce glazing performance”, confirm the original demand and margin, then test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, future flexibility and acceptance evidence.

For “Can we simplify thermal breaks”, remove components, geometry or labour only where thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, access, testing, maintainability and adjacent packages remain protected.

Before agreeing to “Can we reduce wind screens”, confirm the original demand and margin, then test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, future flexibility and acceptance evidence.

Before agreeing to “Can we reduce canopies”, confirm the original demand and margin, then test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, future flexibility and acceptance evidence.

For “Can we optimise façade orientation details”, remove components, geometry or labour only where thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, access, testing, maintainability and adjacent packages remain protected.

Before agreeing to “Can we remove redundant air seals”, confirm the original demand and margin, then test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, future flexibility and acceptance evidence.

Before agreeing to “Can we reduce specialist membranes”, confirm the original demand and margin, then test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, future flexibility and acceptance evidence.

For “Can we change glazing ratios”, test the proposal against thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, interfaces with façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, evidence and work already procured.

For “Can we simplify louvre design”, remove components, geometry or labour only where thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, access, testing, maintainability and adjacent packages remain protected.

Before agreeing to “Can we reduce façade testing”, confirm the original demand and margin, then test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, future flexibility and acceptance evidence.

For “Can we use standard thermal-bridge details”, group requirements by thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, location and interface; retain exceptions where the design basis genuinely differs.

Before agreeing to “Can we reduce condensation-control measures”, confirm the original demand and margin, then test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, future flexibility and acceptance evidence.

For “Can we redesign geometry instead of adding mitigation”, test the proposal against thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, interfaces with façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, evidence and work already procured.

For “Can we use landscape for wind mitigation”, set the non negotiable performance and approval criteria first, then compare whole of project cost rather than package price alone.

For “Can we accept slightly different comfort criteria”, check whether the saving survives redesign, coordination, testing, programme, defects, maintenance and warranty consequences.

Before agreeing to “Can we reduce modelling iterations”, confirm the original demand and margin, then test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, future flexibility and acceptance evidence.

Before accepting “Can we use contractor alternatives”, compare thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, evidence, compatibility, warranty, lead time, commissioning and approval status before calling it equivalent.

Before agreeing to “What geometry change eliminates the most specialist mitigation”, confirm the original demand and margin, then test effects on thermal performance, condensation and moisture control, air leakage, wind pressure and comfort, façade and envelope, architecture and geometry, mechanical loads and operation, structure and wind loads, future flexibility and acceptance evidence.