PropCalcHow to Estimate Renovation Costs Accurately: A Room-by-Room Guide
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RenovationMay 10, 20268 min read

How to Estimate Renovation Costs Accurately: A Room-by-Room Guide

How to Estimate Renovation Costs Accurately: A Room-by-Room Guide

Estimating renovation costs accurately is crucial whether you're flipping, preparing a rental property, or renovating your own home. The difference between an accurate and inaccurate estimate can be the difference between profit and loss.

The Three Quality Levels

Level 1: Economy

Focuses on functionality. Uses basic materials: laminate countertops, standard fixtures, vinyl or economy ceramic flooring. Ideal for rental properties where durability matters more than aesthetics.

Typical cost: €250–€400/m²

Level 2: Standard/Mid-Range

Balance between quality and cost. Mid-range materials, careful finishes. Suitable for most residential flips and properties for sale.

Typical cost: €400–€700/m²

Level 3: Premium

High-quality materials, careful design, superior finishes. For luxury properties or premium market areas.

Typical cost: €700–€1,500+/m²

Costs by Work Category (Portugal, 2026)

Kitchen

WorkEconomyStandardPremium
Kitchen units (per linear metre)€300–€500€600–€1,200€1,500–€4,000+
Countertop€100–€200€200–€500€500–€2,000+
Appliances (set)€500–€800€1,000–€2,000€3,000–€8,000+
Total typical kitchen (10 m²)€3,000–€5,000€6,000–€12,000€15,000–€30,000+

Bathroom

WorkEconomyStandardPremium
Sanitary ware (toilet, basin, bath/shower)€300–€600€700–€1,500€2,000–€6,000+
Tiles (per m²)€15–€25€30–€60€80–€200+
Total typical bathroom (5 m²)€2,500–€4,500€5,000–€9,000€12,000–€25,000+

Flooring

TypeMaterial CostInstallationTotal/m²
Vinyl (LVT)€8–€20€8–€15€16–€35
Economy ceramic€10–€20€15–€25€25–€45
Standard ceramic€20–€50€15–€25€35–€75
Hardwood€40–€120€25–€50€65–€170

Renovation Costs by Property Size (Portugal, 2026)

PropertyLight RenovationMedium RenovationFull Renovation
1-bed (50 m²)€8,000–€15,000€15,000–€30,000€30,000–€55,000
2-bed (80 m²)€12,000–€22,000€22,000–€45,000€45,000–€80,000
3-bed (110 m²)€16,000–€30,000€30,000–€60,000€60,000–€110,000
House (200 m²)€30,000–€55,000€55,000–€110,000€110,000–€200,000+

Most Common Estimation Mistakes

  1. Not including VAT (23%) — material prices are often quoted ex-VAT

  2. Forgetting demolition and debris removal costs — €500–€2,000 for a 2-bed

  3. Not budgeting for contingencies — always reserve 15–20% of total budget for surprises

  4. Underestimating labour costs — skilled labour is scarce in Portugal and prices rose 20–30% since 2022

  5. Ignoring licensing costs — works that alter structure or area may require a building permit (€500–€3,000)

Use the Fix & Flip Calculator to integrate these costs into your project profitability analysis.

Room-by-Room Cost Breakdown (Portugal 2026)

Kitchen full renovation: €8,000-€25,000 (cabinets 40%, appliances 25%, worktops 15%, plumbing/electrical 15%, tiling 5%). Bathroom: €4,000-€12,000. Living areas: flooring €25-€80/m², painting €8-€15/m². Electrical rewiring: €3,000-€8,000. Plumbing overhaul: €2,000-€6,000.

The Contingency Question

Post-2000 construction with cosmetic work: 5-10% contingency. 1970s-2000s moderate renovation: 10-15%. Pre-1970s structural renovation: 15-25%. Listed buildings: 25-40%. Common surprises: hidden water damage, asbestos removal (€2,000-€10,000), inadequate structural support, outdated systems not meeting current regulations.

Labour Costs vs Materials

Labour represents 40-60% of total cost in Portugal. Daily rates: general builder €80-€150, electrician €100-€180, plumber €100-€180, tiler €90-€160, painter €70-€120, carpenter €100-€180. Lisbon and Algarve are 20-40% more expensive than interior regions.

Timeline Planning

Cosmetic refresh: 2-4 weeks. Kitchen and bathroom: 4-8 weeks. Full apartment renovation: 8-16 weeks. Structural renovation: 12-24 weeks. Complete gut renovation: 6-12 months. Add 20-30% to any contractor's estimate for realistic planning.

Use our Renovation Calculator to build a detailed budget with country-specific cost data.

Value Engineering: Maximising Return per Euro

Value engineering means finding the optimal balance between cost and quality for each renovation element. Key principles include:

Prioritise visible improvements over hidden ones — guests and buyers notice kitchens, bathrooms, and flooring before they notice new plumbing behind walls. Spend 60% of your budget on visible elements and 40% on essential infrastructure.

Buy materials during sales periods. Portuguese home improvement stores (Leroy Merlin, AKI, IKEA) run major promotions in January and September. Tiles, sanitaryware, and flooring can be 30-50% cheaper during these periods.

Consider alternative materials that look premium but cost less: engineered wood vs solid hardwood (40% cheaper, nearly identical appearance), large-format porcelain tiles vs natural stone (60% cheaper, easier maintenance), and quartz worktops vs granite (similar price but more consistent quality).

Getting Accurate Quotes

The quality of your renovation budget depends on the quality of your quotes. Follow these principles:

Get three quotes minimum for any work above €5,000. Ensure all quotes cover the same scope by providing a detailed written specification. Beware of quotes that are 30%+ below others — they often indicate the contractor hasn't understood the full scope or plans to cut corners.

Fixed price vs day rate: For defined scope work (new kitchen, bathroom renovation), always insist on fixed price. Day rates are only appropriate for exploratory work or when scope cannot be defined upfront (e.g., opening walls to assess structural condition).

Payment milestones: Structure payments around completed work: 10-20% deposit, 30% at rough-in completion (plumbing, electrical first fix), 30% at finishing stage, and 10-20% upon final completion and snagging. Never pay the final instalment until all defects are resolved.

Written contracts: Even for small jobs, document the agreed scope, price, timeline, and payment terms in writing. In Portugal, for works above €5,000, a formal contract (contrato de empreitada) provides legal protection for both parties.

Reviewed by Luís Castanheira

Founder of PropCalc

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