When fitting out your home or office, you will face an early question that sets the course of the whole project: should I contract for design only and then find a contractor, or contract with one firm for design and build? Each option has its advantages and risks, and the wrong choice can mean a beautiful design on paper executed quite differently, or a turnkey contract with vague specifications whose cost surprises you. This guide compares the two options clearly, explains when each suits you, and lists the clauses every interior design contract in Saudi Arabia should include.
Option One: Design Only
You contract with a design office that hands you a complete package, then choose the fit-out contractor yourself.
- Advantages: freedom to choose the contractor and compare prices, greater budget control, and the option of carrying out the project in phases.
- Risks: the contractor may not follow the details, responsibility is split between designer and contractor when something goes wrong, and it takes your time to follow up.
- Suits: those with experience managing contractors, time to follow up, or a budget they want to spread out.
Option Two: Design and Build
One firm designs, builds and hands over the space ready.
- Advantages: one party responsible for the result, closer match between design and execution, and less time spent coordinating.
- Risks: price comparison is harder, and it needs a contract with clear specifications so materials are not swapped for lesser ones.
- Suits: those who want a guaranteed result without daily follow-up, or commercial projects with tight deadlines.
Quick Comparison
| Item | Design only | Design and build |
|---|---|---|
| Responsibility | Split | One party |
| Cost control | Comparatively higher | Depends on contract clarity |
| Time and follow-up | More | Less |
| Match to design | Depends on the contractor | Usually higher |
| Flexibility to build in phases | High | Limited |
A Third Option: Design With Supervision
A middle route combining the benefits of both: you contract for design, choose the contractor, and the designer supervises execution with periodic visits to ensure compliance. Read: Periodic-visit supervision.
What Every Contract Should Include
- Detailed drawings: floors, ceilings, lighting and joinery.
- Material schedules with specifications and models, not just "or equivalent".
- The number of revisions included and the cost of extras.
- Supervision visits by the designer during execution if the contract is for design only.
- In build contracts: a schedule, payments tied to progress, and a warranty on the works.
When comparing contractor bids read: How to compare contractor bids.
How to Decide
| If you... | The better fit is usually |
|---|---|
| Have no time to follow up | Design and build |
| Want the lowest cost with acceptable quality | Design only with competing bids |
| Want both control and compliance | Design with supervision |
| Run a commercial project with an opening date | Design and build with a clear contract |
Common Mistakes
- Starting work on a concept design without detailed drawings.
- A build contract without a materials schedule.
- Changing the design during execution without documenting the cost.
- Relying on 3D images without construction drawings. Read: Render or virtual tour?.
Frequently Asked Questions
Does interior design need a permit?
Interior works that do not affect building components or structural elements differ from licensed modifications. Read: Modifying building components.
Can I start with design and decide on execution later?
Yes, and it is a practical option that gives you time to compare build bids.
How much does interior design cost?
It depends on the area and deliverables. Read: Interior design cost in Riyadh.
Is it different for offices and shops?
Commercial projects usually need to meet safety requirements and an opening date, which favours a turnkey contract or supervision. Read: Office design.
Who is responsible if execution differs from the design?
With design only, it depends on the two contracts and the clarity of the drawings; with design and build, the single firm bears it.
How Abak Engineering Consultancy Helps
Abak is an accredited engineering office in Riyadh offering interior design with detailed drawings and clear material schedules, with the option of supervising execution to ensure the result matches the design. Learn about our interior design services, or For professional support, see our Interior Design service. contact us.
Regulatory information is based on the Balady platform and the Ministry of Municipalities and Housing, and procedures may be updated by the competent authority. Last reviewed: October 2026.