Void Time Calculator

Reducing void time is one of the fastest ways to save money and accelerate retrofit delivery.
The Void Time Calculator helps housing providers quantify time savings and cost reductions achieved by switching from disruptive radiator upgrades to low-impact Add2Rad installations.

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🎯 Purpose

Traditional radiator upsizing can extend void periods by days or even weeks — especially where:

• floors need lifting
• pipework must be rerouted
• walls require repair or redecoration

Add2Rad eliminates most of this disruption.

This calculator provides a clear, data-driven estimate of:

• void days saved
• operational savings
• financial impact across a programme

Perfect for SHDF, ECO, PAS 2035 and internal retrofit business cases.

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📥 Calculator Inputs

To estimate the impact, enter:

• Number of homes in the project or programme
• Decant cost per day (if applicable — some landlords use void cost/day instead)
• Install duration without Add2Rad
  • e.g., 2–3 days for radiator swaps across a property
• Install duration with Add2Rad
  • often same-day or significantly reduced

These inputs provide the baseline vs improved scenario.

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📤 Outputs Provided

The tool calculates:

Days Saved

• Total void days eliminated
• Percentage reduction across the programme

Cost Saved

• Direct financial savings from avoided void periods
• Additional savings through reduced staff time and logistics

Portfolio Impact

• Scaled results for large estates
• Per-100-homes summary
• Useful for long-term financial planning and multi-phase SHDF bids

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🏛 Why Void Time Matters in Retrofit

Void time affects:

• rent arrears and revenue loss
• programme delivery speed
• tenant satisfaction and re-let timelines
• labour planning and contractor costs
• phased decarbonisation scheduling

Switching to Add2Rad reduces the need for intrusive works, helping providers keep properties occupied and moving.

“Every day saved in a void is a day gained back in service — and in revenue.”

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📘 Use Cases

The Void Time Calculator is ideal for:

• Board papers
• Funding bids
• SHDF submissions
• PAS 2035 options appraisals
• Internal business-case modelling
• Procurement comparisons vs radiator swaps

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Use this tool alongside the Decant Savings Tool to build a complete ROI model for low-disruption emitter upgrades.

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