Usually included
- Earthworks, base preparation, blinding, reinforcement, concrete, waterproofing interfaces, drainage, backfill, and compaction.
- Inspection hold points before concrete pour and before backfill.
Regional model
Foundation cost per m2
Foundation cost is the first major place where a construction budget can become unrealistic. A simple per-m2 number is only safe when soil, slope, water, excavation, compaction, and utility penetrations are understood.
Budget snapshot
Location Regional model
Planning range IDR 1.2M-3.2M / m² of building area
Best for Checking whether soil, slope, excavation, waterproofing, and drainage risk are properly allowed for.
Example planning scenarios
| Scenario | Area / basis | Specification | Planning range | Unit range | Important note |
|---|---|---|---|---|---|
| Easy soil baseline | 150 m² building | Known soil, simple excavation, normal backfill and compaction, no major retaining structure. | IDR 180M-420M | IDR 1.2M-2.8M / m² | Requires survey and basic geotechnical confirmation. |
| Unknown soil or slope | 250 m² building | More excavation risk, drainage allowance, waterproofing interfaces, and compaction control. | IDR 300M-800M | IDR 1.2M-3.2M / m² | Do not lock budget before soil and water path are understood. |
| Difficult access or retaining | 350 m² building | Restricted equipment access, retaining elements, groundwater or stormwater risk. | IDR 525M-1.35B | IDR 1.5M-3.9M / m² | This should be treated as a separate risk package, not hidden inside a house m2 rate. |
How to use this guide
Start with the low range only after topographic survey and geotechnical assumptions are available.
If the site has slope, groundwater, unknown fill, or poor access, split foundation into a separate budget package.
Scope assumptions
Usually excluded or priced separately
- Deep piles, major retaining walls, dewatering systems, and specialist ground improvement unless separately priced.
- Design fees and geotechnical investigation fees.
What changes the number
- Missing geotechnical data turns foundation from a scope item into a contingency problem.
- Backfill and compaction failures often create settlement, cracks, drainage defects, and finish damage later.
- Utility penetrations must be coordinated before concrete, not drilled later as an afterthought.
Connect this guide to the product workflow
The cost guide is useful only when it is tied back to stage pages, checklists, mistakes, and the work sequence for execution control.
Pre-construction & site preparation
Foundation & underground works
Waterproofing & wet areas
Facade & site works
Related glossary articles
Site drainage
Ground-level water management around the building.
Waterproofing
Barrier systems preventing water penetration.
Hold point
A required pause in the work sequence where an inspection or approval must happen before work continues.
Inspection and test plan
A quality control plan that lists inspections, tests, acceptance criteria, hold points and required records for a work package.
FAQ
Can foundation be priced only by floor area?
Only for early planning. Real cost depends on soil, excavation depth, water, reinforcement, concrete volume, waterproofing interfaces, and drainage.
What is the most important control point?
Do not pour concrete until excavation, base preparation, reinforcement, embedded items, penetrations, and survey positions are checked.