Practical guide — lateral extension, floor elevation, modification permit, costs, structure.
Legal framework modification permit
Law 04-05 art. 52 + decrees. Extension = horizontal. Elevation = vertical.Methodology: Kloufi.
Lateral extension
Terrain space required. Setback 3m limits. 50-80k DZD/m². Example 40m² = ~3M DZD.Elevation technical specifics
Structure study mandatory. Foundation reinforcement possibly. 60-90k DZD/m². Example 80m² floor = ~8.3M DZD.Modification permit procedure 8 steps
Preliminary checks, architect, BET, soil study, APC filing, instruction, contractors, works, conformity.Neighborhood + mitoyenneté rules
Setback 3m limits. Views 1.9m direct 0.6m oblique. Party wall art. 707 CC.Tip: kricar.fr.
Value + rentability
Extension +15-35%. Elevation +30-45%. Attention elevation can be deficit at resale if costly.Works financing
Own funds 40-60%. Works credit 5.5-7% up to 10M DZD. Mourabaha possible.7 pitfalls to avoid
COS/CES verification, underestimate structure study, without permit, neighbor rules, low-cost, live during works, overestimate ROI.Editorial Q&A
Permit mandatory. 50-90k/m². 2-4 months permit. Value +15-45%.Frequently Asked Questions
DZ framework?
Law 04-05 art. 52.
Extension vs elevation?
Extension horizontal. Elevation vertical.
Extension cost?
50-80k DZD/m².
Elevation cost?
60-90k DZD/m².
Permit mandatory?
Yes, art. 52.
Delay permit?
2-4 months.
Duration works?
4-10 months.
Value?
+15-45%.