Prescriptive specification - Revision history

Designing Buildings at 06:17, 12 October 2020

2020-10-12T06:17:35Z

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	* [[What_should_be_included_in_a_scope_of_work%3F\|What should be included in a scope of work?]]		* [[What_should_be_included_in_a_scope_of_work%3F\|What should be included in a scope of work?]]

−	[[Category:Client_procedures]] [[Category:Procurement]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Definitions]] [[Category:Client_procedures]] [[Category:Procurement]]

Designing Buildings at 11:54, 10 March 2020

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	NB an output-based specification defines only the outputs that are required from the project (that is, what it will enable the client to do), it does not attempt to address how those outputs might be achieved. For more information see: Output based specification.		NB an output-based specification defines only the outputs that are required from the project (that is, what it will enable the client to do), it does not attempt to address how those outputs might be achieved. For more information see: Output based specification.

−	~~= Find out more =~~	+	= Related articles on Designing Buildings Wiki =
−		+
−	=== Related articles on Designing Buildings Wiki ===	+

	* Contract documents.		* Contract documents.
		+	* Final specifications.
	* Outline specification.		* Outline specification.
	* Output-based specification.		* Output-based specification.

Designing Buildings at 07:09, 28 August 2018

2018-08-28T07:09:09Z

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	Key to deciding whether to specify a component prescriptively or not is considering who is best placed to select that component, i.e. who is most likely to achieve best value, the client, the designers, the contractor or suppliers.		Key to deciding whether to specify a component prescriptively or not is considering who is best placed to select that component, i.e. who is most likely to achieve best value, the client, the designers, the contractor or suppliers.
		+
		+	NB an output-based specification defines only the outputs that are required from the project (that is, what it will enable the client to do), it does not attempt to address how those outputs might be achieved. For more information see: Output based specification.

	= Find out more =		= Find out more =

Designing Buildings at 07:07, 28 August 2018

2018-08-28T07:07:16Z

Editor at 12:01, 21 August 2018

2018-08-21T12:01:27Z

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	Prescriptive specifications give the client much more certainty about the end product when making their final investment decision (i.e. when they appoint the contractor), and place a greater burden on the architect to ensure proper installation rather than the general contractor.		Prescriptive specifications give the client much more certainty about the end product when making their final investment decision (i.e. when they appoint the contractor), and place a greater burden on the architect to ensure proper installation rather than the general contractor.

−	Typically, prescriptive specifications are written for more complex buildings, or buildings where the client has requirements that might not be familiar to contractors and where certainty regarding the exact nature of the completed development is more important to the client. As opposed to performance specifications which tend to be written on projects that are straight-forward, standard building types.	+	Typically, prescriptive specifications are written for more complex buildings, or buildings where the client has requirements that might not be familiar to contractors and where certainty regarding the exact nature of the completed development is more important to the client. As opposed to [[Performance_specification\|performance specifications]] which tend to be written on projects that are straight-forward, standard building types.

	Prescriptive specifications can also be used on projects where there is a very specific end result required; for example, where it involves a repeat client such as a large retailer where, even though the building type is often straight-forward, a specific and branded end result is required.		Prescriptive specifications can also be used on projects where there is a very specific end result required; for example, where it involves a repeat client such as a large retailer where, even though the building type is often straight-forward, a specific and branded end result is required.

Editor at 12:00, 21 August 2018

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	For more information, see Specifications.		For more information, see Specifications.

−	Specifications vary considerably depending on the stage to which the design has been developed, ranging from performance (open) specifications that require further design by a contractor or supplier, to prescriptive (closed) specifications where the design is already complete when the project is tendered.	+	Specifications vary considerably depending on the stage to which the design has been developed, ranging from [[Performance_specification\|performance (open) specifications]] that require further design by a contractor or supplier, to prescriptive (closed) specifications where the design is already complete when the project is tendered.

	Prescriptive specifications typically contain detailed descriptions of the following components:		Prescriptive specifications typically contain detailed descriptions of the following components:

Editor at 12:00, 21 August 2018

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	Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information but need to be read alongside other contract documentation such as quantities, schedules and drawings.		Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information but need to be read alongside other contract documentation such as quantities, schedules and drawings.

−	For more information, see Specifications ~~for construction~~.	+	For more information, see Specifications.

	Specifications vary considerably depending on the stage to which the design has been developed, ranging from performance (open) specifications that require further design by a contractor or supplier, to prescriptive (closed) specifications where the design is already complete when the project is tendered.		Specifications vary considerably depending on the stage to which the design has been developed, ranging from performance (open) specifications that require further design by a contractor or supplier, to prescriptive (closed) specifications where the design is already complete when the project is tendered.

Editor at 12:00, 21 August 2018

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	* Service level specification.		* Service level specification.
	* Specification.		* Specification.
−	* Specification ~~guidance~~.	+	* Specification basics.
	* Tender documentation.		* Tender documentation.
−	* [[What_should_be_included_in_a_scope_of_work?\|What should be included in a scope of work?]]	+	* [[What_should_be_included_in_a_scope_of_work%3F\|What should be included in a scope of work?]]

	[[Category:Client_procedures]] [[Category:Procurement]]		[[Category:Client_procedures]] [[Category:Procurement]]

Editor: Created page with "Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information but need to b..."

2018-08-21T12:00:00Z

Created page with "Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information but need to b..."

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Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information but need to be read alongside other contract documentation such as quantities, schedules and drawings.

For more information, see Specifications for construction.

Specifications vary considerably depending on the stage to which the design has been developed, ranging from performance (open) specifications that require further design by a contractor or supplier, to prescriptive (closed) specifications where the design is already complete when the project is tendered.

Prescriptive specifications typically contain detailed descriptions of the following components:

* General requirements relating to regulations and standards.
* The type of products and materials required.
* The execution and installation methods required.

Prescriptive specifications give the client much more certainty about the end product when making their final investment decision (i.e. when they appoint the contractor), and place a greater burden on the architect to ensure proper installation rather than the general contractor.

Typically, prescriptive specifications are written for more complex buildings, or buildings where the client has requirements that might not be familiar to contractors and where certainty regarding the exact nature of the completed development is more important to the client. As opposed to performance specifications which tend to be written on projects that are straight-forward, standard building types.

Prescriptive specifications can also be used on projects where there is a very specific end result required; for example, where it involves a repeat client such as a large retailer where, even though the building type is often straight-forward, a specific and branded end result is required.

In fact, most projects will involve a combination of performance and prescriptive specifications, where items crucial to the design will be specified prescriptively (such as external cladding), while less critical items, or items requiring specialist design are specified only by performance (such as service lifts).

Key to deciding whether to specify a component of the building prescriptively or not is considering who is best placed to select that components, i.e. who is most likely to achieve best value, the client, the designers, the contractor or suppliers. Large clients may be able to procure certain products at competitive rates themselves (for example, the government).

= Find out more =

=== Related articles on Designing Buildings Wiki ===

* Contract documents.
* Outline specification.
* Output-based specification.
* Performance specification.
* Production information.
* Service level specification.
* Specification.
* Specification guidance.
* Tender documentation.
* [[What_should_be_included_in_a_scope_of_work?|What should be included in a scope of work?]]

[[Category:Client_procedures]] [[Category:Procurement]]

← Older revision		Revision as of 07:07, 28 August 2018
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−	Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information ~~but~~ need to be read alongside other contract documentation such as quantities, schedules and drawings.	+	Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information and need to be read alongside other contract documentation such as quantities, schedules and drawings.

	For more information, see Specifications.		For more information, see Specifications.

−	Specifications vary considerably depending on the stage to which the design has been developed, ranging from [[Performance_specification\|performance (open) specifications]] that require further ~~design~~ by a contractor or supplier, to prescriptive (closed) specifications ~~where~~ the design is already complete when the project is tendered.	+	Specifications vary considerably depending on the stage to which the design has been developed, ranging from [[Performance_specification\|performance (open) specifications]] that require further development by a contractor or supplier, to prescriptive (closed) specifications for which the design is already complete when the project is tendered.

	Prescriptive specifications typically contain detailed descriptions of the following components:		Prescriptive specifications typically contain detailed descriptions of the following components:
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	* The execution and installation methods required.		* The execution and installation methods required.

−	Prescriptive specifications give the client much more certainty about the end product when making ~~their final~~ investment ~~decision~~ (~~i.e.~~ when they appoint the contractor), and place a greater burden on the ~~architect~~ to ensure proper installation rather than the ~~general~~ contractor.	+	Prescriptive specifications give the client much more certainty about the end product when making investment decisions (such as when they appoint the contractor), and place a greater burden on the designer to ensure proper installation rather than the contractor.

−	Typically, prescriptive specifications are written for more complex buildings, or buildings where the client has requirements that might not be familiar to contractors and where ~~certainty regarding~~ the exact nature of the completed development is more important to the client. As opposed to [[Performance_specification\|performance specifications]] which tend to be written on projects that are straight-forward, standard building types.	+	Typically, prescriptive specifications are written for more complex buildings, or buildings where the client has specific requirements that might not be familiar to contractors or suppliers and where the exact nature of the completed development is more important to the client. This is as opposed to [[Performance_specification\|performance specifications]] which tend to be written on projects that are straight-forward, standard building types.

	Prescriptive specifications can also be used on projects where there is a very specific end result required; for example, where it involves a repeat client such as a large retailer where, even though the building type is often straight-forward, a specific and branded end result is required.		Prescriptive specifications can also be used on projects where there is a very specific end result required; for example, where it involves a repeat client such as a large retailer where, even though the building type is often straight-forward, a specific and branded end result is required.
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	In fact, most projects will involve a combination of performance and prescriptive specifications, where items crucial to the design will be specified prescriptively (such as external cladding), while less critical items, or items requiring specialist design are specified only by performance (such as service lifts).		In fact, most projects will involve a combination of performance and prescriptive specifications, where items crucial to the design will be specified prescriptively (such as external cladding), while less critical items, or items requiring specialist design are specified only by performance (such as service lifts).

−	Key to deciding whether to specify a component ~~of the building~~ prescriptively or not is considering who is best placed to select that ~~components~~, i.e. who is most likely to achieve best value, the client, the designers, the contractor or suppliers~~. Large clients may be able to procure certain products at competitive rates themselves (for example, the government)~~.	+	Key to deciding whether to specify a component prescriptively or not is considering who is best placed to select that component, i.e. who is most likely to achieve best value, the client, the designers, the contractor or suppliers.

	= Find out more =		= Find out more =