Official sources and market context
Use official construction, housing and energy-efficiency statistics as context—not as a substitute for local comparable evidence, a surveyor's valuation or a contractor quotation.
Last reviewed: 19 September 2026
Renovation & valuation
Renovation Value ROI Calculator
Prioritise renovation works by their potential contribution to value, project cost and the local market ceiling before you commit a budget.
Objective
Use one decision screen to compare the cost of each planned work with a cautious value-uplift range. It does not promise a selling price: the local ceiling you enter limits the estimated post-works value.
Property market
Country selects the market context. Your language and market remain independent; all assumptions are editable.
Property baseline
Works and cost plan
Repair defects, moisture, electrical, plumbing, roof or waterproofing issues before cosmetic work.
Insulation, windows, heating, ventilation or solar measures; combine with the energy tool for a separate savings screen.
Functional replacement or upgrade; specify finish level and appliances in the quotation.
Waterproofing, fixtures, ventilation and finishes; check hidden plumbing risk.
High-visibility presentation improvements with limited technical scope.
Curb appeal, usable external space, storage and common-access improvements.
Internal redistribution, new room or structural work; validate permits, engineering and market fit first.
Value-creation decision
🇵🇹 Portugal · 3 selected works
Cautious
Potential value uplift
20 965 €
Estimated value after works
270 965 €
Net value created
−15 635 €
Central
Potential value uplift
29 951 €
Estimated value after works
279 951 €
Net value created
−6649 €
Upside
Potential value uplift
35 000 €
Estimated value after works
285 000 €
Net value created
−1600 €
All-in works budget
36 600 €
Contingency
3660 €
Technical / project costs
2440 €
Priority order to review
1Prioritise
Defects, water and systems
Value contribution per unit of direct work cost: 1.16×
2Validate
Paint, floors and lighting
Value contribution per unit of direct work cost: 0.90×
3Validate
Kitchen
Value contribution per unit of direct work cost: 0.86×
How the estimate works
- 1.Choose the property market, an objective, the current value and a realistic ceiling from comparable properties in the same micro-location.
- 2.Select only the works you are considering and replace the initial costs with a measured quotation or a preliminary bill of quantities.
- 3.The tool applies a cautious, editable screening multiple by work type and objective, adds contingency and technical costs, then caps value uplift at the market ceiling.
Worked example
In Porto, a €250,000 flat has a €285,000 ceiling from comparable renovated homes. The owner tests €12,000 of repairs, €14,000 for the kitchen and €4,500 for presentation, plus 12% contingency and 8% technical costs.
Scope and limits
This is an educational economic screen. It does not survey defects, certify works, calculate permits, establish a property valuation, guarantee rental or sale demand, or replace a detailed quantity take-off and tender comparison.
Country-specific check
Confirm municipal licensing, condominium approvals and the technical scope before awarding the work.
Frequently Asked Questions
Does a new kitchen always add more value than it costs?
No. A kitchen may improve buyer appeal, but its recoverable value depends on the starting condition, segment, specification and comparable homes. The tool keeps the uplift range below a promise and caps it at your local ceiling.
What should I enter as the local market ceiling?
Use a cautious price from genuinely comparable, renovated homes in the same micro-location and building type. Asking prices are not proof of achieved values; a qualified valuation can be appropriate before a major project.
Why are contingency and technical costs separate?
A contractor's direct works price can exclude design, engineering, licensing, project management, surveys and unforeseen conditions. Separating them makes the all-in budget auditable.
Can I use this for my own home?
Yes. Select “Live in the property”, but treat comfort and lower maintenance as benefits separate from resale value. A personal preference may still be a good decision even when it is not fully recoverable on sale.