How to manage temporary works in construction - Book - Page 107
4.4 Design checking
4.4.9
On completion of the design and design check, BS 5975-1:2024 clause 12.7.5 states that a
design certificate and design check certificate should be issued for Category 1, 2 and 3. The
design certificates should meet the following criteria. This is for illustration purposes only.
Design certification criteria
1. Statement confirming the design meets the requirements of the design brief
2. State the standards and literature used and whether they’ve been interpreted
properly
3. Lists the constraints and loading conditions
4. Identifies drawings, installation guides and sketches
5. Identifies design specifications used
6. Identifies design and build methodology
7. Signed by designer
8. Signed by design checker
9. Issued to the TWC, and Lead TWD where required
Resolution of queries by the temporary works design checker
4.4.10
In the event of any queries being raised by the TWDC, BS 5975-1:2024 clause 12.8 provides
guidance on how design queries should be handled and resolved. In summary these are as
follows:
Category
Queries
issued
direct to
designer?
Involve
TWC?
Involve
PC’s
TWC?
Not
required
unless
there is
interface
Not
required
unless
there is
interface
Involve
the PD?
Third
party?
Should the
queries be
referred
back to
TWDC?
Not usually
required
Only if
affected or
required
Possibly
Not usually
required
Only if
affected or
required
Possibly
0
Standard
Yes
Not
required
1
Simple
Yes
Not
required
2
More
Complex
or
involved
Yes
Yes
Yes
Not usually
required
Only if
affected or
required
Yes
3
Complex
or
innovative
No
Yes
Yes
Yes
Only if
affected or
required
Yes
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