Terrace Planning Guide | Structure & Construction Costs

Terrace planning starts with site analysis and ends with precise budgeting, ensuring stable structures that last 20+ years under Baltic loads while integrating seamlessly with home architecture. Comprehensive guides cover dimensions (optimal 20m² for families), foundations like screw piles (€15-25/pile), and material breakdowns totaling €90-€180/m² for complete builds.

Site Assessment Essentials

Evaluate sun exposure (south-facing ideal for warmth), wind patterns, soil type (screw piles for clay/soft ground), drainage slopes (2% minimum), and views/privacy needs. Measure usable area excluding setbacks (1m from boundaries in Latvia); test load capacity for multi-level designs. Digital tools like SketchUp or terrace calculators predict shading/traffic flow before commitment.

Structural Components Breakdown

Wooden terrace structure demands precision:

• Beams/Joists: 150x50mm C24 pine spaced 40-50cm, spanning 3-4m max (€10-15/m).

• Connections: Galvanized brackets/screws (Class 5.8+, €0.50-€2/piece) prevent twisting.

• Drainage: 20mm gaps + under-deck membrane channels water away, avoiding rot.

• Load Rating: 300-500kg/m² live load for furniture/heavy users.

Step-by-Step Planning Process

1. Zone Layout: 40% dining (2.5x2m table), 30% lounge (sofa + coffee), 30% paths (90cm wide).

2. Elevation Design: Single-level <1m height often permit-free; multi-level needs engineering.

3. Foundation Selection: Screw piles (6-12 per 20m², 15min install) vs concrete (€50-100/m²).

4. Material Spec: Boards 27x145mm, anti-slip R11 rating for wet climates.

5. Budget Template: Foundations 20%, frame 25%, decking 35%, labor 20%.

Detailed Cost Structure (20m² Terrace)

Custom shapes add 15-25%; modular kits cut 20% via pre-cut parts.

Common Pitfalls & Solutions

• Sagging: Undersized joists—use span tables (max 50cm centers).

• Water Pooling: Flat layout—enforce 1:50 slope to drains.

• Creaking: Loose fixings—pre-drill + construction adhesive.

• Overbudget: Scope creep—lock design before ordering.