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Comprehensive Professional Renovation Cost Report

Heritage Property in Wildberg, Baden-Württemberg

Executive Summary

This report provides a detailed breakdown of the estimated costs for a full professional renovation of your heritage-listed (Denkmalschutz) clay (Lehm) building in Wildberg. The property encompasses approximately 245 m² of current usable space and 230 m² of undeveloped attic space, for a post-renovation total of about 475 m².

The renovation focuses on modernizing the structure while preserving its historic character, addressing moisture issues common in clay buildings, and incorporating energy-efficient upgrades to meet German standards (GEG - Buildings Energy Act).

Total Estimated Cost
€493,600

Including VAT, materials, labor, and contingencies

Cost per m²
€400-€1,600

Average heritage renovation rate

Timeline
6-12 months

Depending on permits and weather

Subsidy Potential
20-50%

KfW and state heritage funding

Overall Cost Breakdown by Category

Category Estimated Cost Percentage Notes
Planning & Permits €15,000 - €25,000 3-5% Architect, heritage approvals, surveys
Demolition & Preparation €8,000 - €12,000 2% Site clearing and waste disposal
Structural Repairs & Waterproofing €50,000 - €80,000 10-16% Critical for clay buildings
Insulation (Floor/Ceiling/Roof) €13,000 - €20,000 3-4% Breathable materials for heritage
Electrical, Plumbing & Heating €64,000 - €80,000 13-16% Full rewiring, modern systems
Drywall & Interior Walls €15,000 - €25,000 3-5% €40-€80/m€ installed
Flooring (Laminate) €12,000 - €18,000 2-4% €45-€85/m€ for 150 m²
Painting & Decorating €8,000 - €12,000 2% €15-€25/m€ for surfaces
Bathroom Renovation €35,000 - €50,000 7-10% Full remodel, 2-3 bathrooms
Attic Build-Out €207,000 - €300,000 42-60% Largest item - 230 m² conversion
Windows, Doors & Exterior €20,000 - €30,000 4-6% Energy-efficient replacements
Contingencies & Fees €25,000 - €40,000 5-8% 10% buffer for surprises

Step-by-Step Renovation Overview

Renovating a heritage house in Germany follows a structured process to comply with regulations like the GEG and Denkmalschutz laws. Steps are sequential to minimize disruptions and ensure safety.

1
Planning, Surveys & Permits
€15,000 - €25,000
1-2 Months
Foundation phase including professional assessments and regulatory approvals.
  • Hire Denkmalschutz architect (€5,000-€8,000) for plans and approvals
  • Structural/mold/moisture surveys (€3,000-€5,000), essential for clay buildings
  • Permit fees and energy consultant (€7,000-€12,000) for GEG compliance
2
Demolition & Site Preparation
€8,000 - €12,000
2-4 Weeks
Clearing existing structures and preparing the site for renovation work.
  • Remove old fixtures, non-structural walls, and flooring (€4,000-€6,000; €20-€50/m€)
  • Waste disposal and container rental (€2,000-€3,000; €120-€180/ton)
  • Asbestos/lead testing if needed (€2,000-€3,000)
3
Structural Repairs & Waterproofing
€50,000 - €80,000
4-6 Weeks
Critical work for clay buildings to address moisture and structural integrity.
  • Clay wall repairs and moisture barriers (€20,000-€30,000; €100-€200/m€)
  • Roof/terrace waterproofing (€15,000-€25,000; €50-€100/m€)
  • Foundation/stability reinforcements (€15,000-€25,000)
4
Insulation (Floor, Ceiling, Roof)
€13,000 - €20,000
3-4 Weeks
Energy-efficient insulation using breathable materials compatible with heritage structures.
  • Breathable materials (e.g., wood fiber) for heritage (€20-€60/m€; 200-300 m² total)
  • Basement ceiling insulation (€3,000-€5,000)
  • Attic floor/roof insulation (€7,000-€10,000)
  • Internal wall insulation if needed (€3,000-€5,000)
5
Electrical Rewiring
€22,500 - €30,000
2-3 Weeks
Complete electrical system upgrade to modern standards.
  • Full system upgrade to modern standards (€200/m€ for 245 m²; includes lighting, outlets)
  • Smart home integration if desired (+€5,000)
6
Plumbing & Heating Installation
€41,500 - €50,000
3-4 Weeks
Modern plumbing and energy-efficient heating systems.
  • Plumbing: €15,000-€20,000 (new pipes, fixtures; €4,000-€8,000 for bathrooms)
  • Heating: €26,500-€30,000 (efficient system, e.g., heat pump; complies with GEG)
7
Drywall & Interior Walls
€15,000 - €25,000
2-3 Weeks
Interior wall construction with moisture-resistant materials.
  • Installation (€40-€80/m€ for 200 m² walls/ceilings)
  • Moisture-resistant boards for clay compatibility (+10%)
8
Flooring Installation (Laminate)
€12,000 - €18,000
1-2 Weeks
Quality laminate flooring installation throughout main areas.
  • Materials and labor (€45-€85/m€ for 150 m² main areas)
  • Underlayment and transitions included
9
Painting & Decorating
€8,000 - €12,000
1-2 Weeks
Professional painting with breathable paints suitable for clay structures.
  • Interior surfaces (€15-€25/m€ for 400-500 m² walls/ceilings)
  • Breathable paints for clay (€1-€10/liter materials + labor)
10
Bathroom Renovation
€35,000 - €50,000
2-3 Weeks
Complete bathroom remodeling for 2-3 bathrooms.
  • Full remodel (tiles €25-€60/m€, fixtures €200-€3,500 each; assume 2-3 bathrooms)
  • Waterproofing and ventilation (€1,500-€2,500 per unit)
11
Attic Interior Build-Out
€207,000 - €300,000
8-12 Weeks
Largest project component: Converting 230 m² of undeveloped attic space into 2-3 residential units.
  • Conversion to 2-3 units (€900-€1,500/m€ for 230 m²)
  • Includes insulation, drywall, flooring, stairs (€3,000-€8,000)
  • Dormers/windows installation (€6,000-€21,000)
12
Final Inspections, Cleaning & Handover
€25,000 - €40,000
1-2 Weeks
Final quality checks, certifications, and project completion.
  • Inspections and certifications (€5,000-€8,000)
  • Final cleaning and waste removal (€2,000-€4,000)
  • Contingency buffer (10% of total for surprises, e.g., additional heritage compliance)

Factors Influencing Costs

Key Cost Drivers & Considerations

  • Inflation & Location: 2025 costs up 1-5% from 2024; rural Wildberg slightly lower than urban areas
  • Heritage Constraints: +20-50% premium for compliant materials and specialized labor
  • Sustainability: Energy upgrades qualify for subsidies, reducing net costs
  • Risks: Unforeseen mold/structural issues could add 10-20%
  • Material Costs: Labor represents 50-60% of costs, materials 30-40%, overhead 10-20%

Important Note: For precise quotes, consult local contractors experienced in heritage renovations. This report provides estimates onlyprofessional assessment is recommended before committing to the project.

Cost Distribution Analysis

Recommendations

Next Steps: Obtain multiple quotes from certified contractors experienced in heritage renovations, and consult a Denkmalschutz architect early. Begin subsidy applications immediately to maximize funding opportunities. The total investment of approximately €493,600 can potentially be reduced by 20-50% through available subsidies and grants.

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Report generated based on October 2025 market data from Baden-Württemberg