PART 09 : ‘Additional Works’ That Incur Separate Costs

Understanding Basic Works vs. Additional Works

Interior construction can be divided into basic works and additional works.
Typically, basic works are handled by the contractor, while additional works are the client’s responsibility.
Knowing these two concepts before you start will help you prepare.
Please note that additional works are usually not included in the initial estimate!

1Basic Works

Basic Works

All items directly executed by the contractor are considered basic works. This includes labor costs for technicians and materials. For basic works, once payment is made, the contractor assumes responsibility. Detailed items vary by company, so be sure to check your specific quote.

Check Carpentry: Processing, installation, and assembly of wood elements—ceilings, walls, partitions

Check Metal & Glass Work: Fabrication/installation/assembly of frames, façades, shelves, lighting fixtures, bars

Check MEP (Mechanical, Electrical & Plumbing) Work: Water/sewer piping, waterproofing, floor leveling, raising slabs

Check Painting: Interior and exterior paint finishes

Check Furniture Installation: Manufacturing/installing counters, tables, benches, sinks, storage units

Check Tiling: Wall and floor tile installation

Check Lighting Installation: Basic fixtures, tracks, etc.

Check Electrical Work: Panel fabrication/installation, wiring, outlet placement, equipment installation

Check Duct Installation: Ventilation hoods, brewers, motors, and ductwork

Check Finishing: Film, sheets, marble, and other finish materials

Check Cleaning (Post-Construction): Final cleaning of the premises

2Additional Works

Additional Works

Works carried out by the client, either DIY or via separate contractors.
DIY can save costs but may lack perfection and places full responsibility on you.
If you hand everything over to the interior company, they will manage subcontractors and supervision—but at a higher cost.
For partial delegation, we recommend entrusting furniture delivery, exterior ductwork, structural reinforcement, sanitary installations, and fire-safety works to professionals.
These areas are regulated and complex, so safety is best ensured by a contractor.

Check Demolition: Removing unwanted ceilings, floors, walls; waste disposal

Check Electrical Expansion & Mains: Increasing contracted power capacity, main line installation

Check MEP Enhancements: Floor drainage, trench/trap reinforcement

Check Fire-Safety Work: Electrical and flame-retardant system installations

Check Structural Reinforcement: Strengthening building framework

Check Sanitary Installations: Placement of sinks, toilets, etc.

Check Exterior Works: Doors, corridor finishes, façade installations

Check External Ducts: Ducting and motor installations to the outside

Check HVAC Installation: HVAC unit setup, gas charging, piping replacement

Check Signage: Interior and exterior sign installations

Check Furniture Supply: Custom chairs, tables, sofas, and other furnishings

Check Audio Installation: Amplifiers, woofers, speakers