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Home Energy Retrofit ROI Calculator for UK Housing
An online tool that models the energy efficiency and cost savings of retrofit interventions (insulation, double glazing, heat pumps, solar, batteries) specifically calibrated for UK housing archetypes from Victorian terraces to 1970s builds, using actual market tariff data.
Why this matters
You live in a Victorian terrace or a 1970s semi and your energy bills are eating a growing chunk of your income. You know insulation, a heat pump, or solar panels could help, but every article gives different numbers. Generic online calculators don't account for your specific house type — solid brick walls, sash windows in a conservation area, or the fact that your terrace shares walls with neighbors. You need to know whether spending £8,000 on external wall insulation will actually pay off given your current tariff and projected energy prices, but no tool combines property-specific modeling with real market pricing to give you a confident answer.
- · Built for UK homeowners in older properties (pre-1945, Victorian, Edwardian, 1970s) considering energy efficiency investments of £2,000-15,000 who need data-driven ROI analysis.
- · Most likely monetization: Freemium with premium analysis reports.
The Pain · Narrative
You live in a Victorian terrace or a 1970s semi and your energy bills are eating a growing chunk of your income. You know insulation, a heat pump, or solar panels could help, but every article gives different numbers. Generic online calculators don't account for your specific house type — solid brick walls, sash windows in a conservation area, or the fact that your terrace shares walls with neighbors. You need to know whether spending £8,000 on external wall insulation will actually pay off given your current tariff and projected energy prices, but no tool combines property-specific modeling with real market pricing to give you a confident answer.
Score Breakdown
Market Signal
Go-to-Market
UK homeowners in pre-1945 properties with EPC ratings of D or below who are actively researching energy efficiency improvements and have a budget of £5,000+ for retrofits
~3-5 million UK homeowners actively considering retrofits, with perhaps 200K-300K in advanced research stages at any time
SEO long-tail targeting queries like 'Victorian terrace insulation ROI' and 'external wall insulation payback period UK'
£29 one-time for detailed property-specific ROI report
200 paid report downloads within 60 days, driven entirely by organic search traffic
MVP Scope · 1–2 weeks
- Research and catalog the 8-10 dominant UK housing archetypes (Victorian terrace, Edwardian semi, 1930s semi, 1970s cavity wall, etc.) with baseline thermal performance data
- Build simplified energy loss model for each archetype incorporating wall type, window type, roof, and floor U-values
- Create database of common retrofit interventions with typical costs, performance improvements, and grant eligibility
- Implement basic scenario calculator: select archetype + interventions → estimated annual savings at current average UK tariff
- Design report template showing payback period, 10-year savings, and CO2 reduction
- Add conservation area and listed building lookup using UK government planning data to flag restrictions
- Integrate current UK tariff structures so savings reflect actual user pricing not just averages
- Build compound intervention modeling (e.g., insulation + heat pump savings are not simply additive)
- Add government grant scheme checker (ECO4, Great British Insulation Scheme, Boiler Upgrade Scheme)
- Create comparison view showing 'do nothing' vs 'minimal intervention' vs 'comprehensive retrofit' scenarios
Differentiation
Why This Might Fail
Self-rebuttal — the most important trust signal
- 1Free government-backed tools and Energy Saving Trust calculators may be 'good enough' for most homeowners, making it hard to justify paying for a premium analysis
- 2Modeling accuracy is fundamentally limited by how well users can characterize their specific property, leading to disappointing real-world results that damage reputation
- 3The one-time purchase model may not generate sufficient revenue per user to sustain the ongoing data maintenance required for accuracy
Evidence Summary
How AI synthesized this insight — no verbatim quotes
The discussion extensively covered the age and characteristics of UK housing stock, with multiple commenters noting they live in properties from the 1800s or early 1900s. Several discussed the challenges and benefits of upgrading old properties with insulation and double glazing. One commenter specifically suggested battery, inverter, and solar as a combination worth investigating for cost reduction. The conversation about heritage building restrictions (sash windows in conservation areas) and the varying thermal performance of different house types demonstrates clear demand for property-specific energy modeling.
Action Plan
Validate this opportunity before writing code
Recommended Next Step
Build
Strong demand signals detected. Real pain, real willingness to pay — start building an MVP.
Landing Page Copy Kit
Ready-to-paste copy based on real Reddit community language — no editing required
Headline
Home Energy Retrofit ROI Calculator for UK Housing
Sub-headline
An online tool that models the energy efficiency and cost savings of retrofit interventions (insulation, double glazing, heat pumps, solar, batteries) specifically calibrated for UK housing archetypes from Victorian terraces to 1970s builds, using actual market tariff data.
Who It's For
For UK homeowners in older properties (pre-1945, Victorian, Edwardian, 1970s) considering energy efficiency investments of £2,000-15,000 who need data-driven ROI analysis
Feature List
✓ Property archetype selector (Victorian terrace, Edwardian semi, 1930s semi, 1970s build, etc.) with pre-loaded thermal models ✓ Interactive scenario builder: combine interventions (loft insulation, wall insulation, heat pump, solar, battery) and see compound savings ✓ ROI calculator factoring in current tariff structure, energy price projections, and available government grants ✓ Conservation area and listed building constraint checker that flags what modifications are permitted ✓ Exportable report for securing financing or contractor quotes
Where to Validate
Share your landing page in r/HN · front_page — that's exactly where these pain points were discovered.
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