Category: Design
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
Design development is the stage between concept design and construction drawings. Dimensions, materials, structural and MEP systems are fixed, disciplines are coordinated, and outline specifications allow a closer cost estimate.
Why it matters on a project
Changes at this stage are relatively cheap; after it they become costly. This is where the owner should settle the big decisions on spaces and materials.
Measurement and pricing
Cost is estimated from approximate quantities of the main elements instead of a general rate per square metre.
Common mistake
Putting off the owner's decisions to the construction drawing stage, so revisions repeat and the permit and tender slip.
Frequently asked questions
How long does design development take?
It depends on project size; for villas often a few weeks if the owner decides quickly.
Can this stage be skipped?
On small projects it is sometimes merged with construction drawings, but that raises the chance of revisions.
Related terms
- Concept designThe first design stage: idea, massing and general layout without construction detail.
- Construction drawingsDetailed drawings used to build the work on site after design approval, including dimensions, levels and details.
- Design briefA document defining the client’s requirements, spaces, functions and budget before design starts.
- Cost planThe project budget split across its elements before design is complete.
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