# Adding more layers to PCB stack up

**URL:** <https://sierraconnect.protoexpress.com/t/adding-more-layers-to-pcb-stack-up/2997>\
**Category:** Schematic and layout\
**Created:** [March 17, 2025, 3:22pm UTC](https://sierraconnect.protoexpress.com/t/adding-more-layers-to-pcb-stack-up/2997 "2025-03-17T15:22:07Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Sajal\_ee](https://avatars.discourse-cdn.com/v4/letter/s/d26b3c/32.png) [@Sajal\_ee](https://sierraconnect.protoexpress.com/u/Sajal_ee)\
**Post date:** [March 17, 2025, 3:22pm UTC](https://sierraconnect.protoexpress.com/t/adding-more-layers-to-pcb-stack-up/2997/1 "2025-03-17T15:22:07Z")

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I have a design of 6-layers in which I might need to add one more layer to separate power plane. I know that the PCB stack up need to be symmetric and I need to add two more layers, not just one.

I am wondering about the price difference with two additional layers used as power planes. There will be no routing on the two additional layers. Will it cost much to go from 6-layers to 8-layers ?

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**Author:** ![timothy.phillips](https://avatars.discourse-cdn.com/v4/letter/t/d78d45/32.png) [@timothy.phillips](https://sierraconnect.protoexpress.com/u/timothy.phillips)\
**Post date:** [March 17, 2025, 7:42pm UTC](https://sierraconnect.protoexpress.com/t/adding-more-layers-to-pcb-stack-up/2997/2 "2025-03-17T19:42:11Z")

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I expect that somebody from Sierra will reply but I have read somewhere that to add 2 layers might add 20% to board cost. If you want, go to any PCB fab website that has oneline quoting and plug in some fake numbers to get a response. It will give you quick rough numbers when considering to increased the PCB specs.

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**Author:** ![lucy.sierracircuits](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/lucy.sierracircuits/32/8_2.png) [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\
**Post date:** [March 17, 2025, 11:35pm UTC](https://sierraconnect.protoexpress.com/t/adding-more-layers-to-pcb-stack-up/2997/3 "2025-03-17T23:35:32Z")

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Thanks for replying. We’re currently busy at IPC APEX!

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**Author:** ![lucy.sierracircuits](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/lucy.sierracircuits/32/8_2.png) [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\
**Post date:** [March 17, 2025, 11:35pm UTC](https://sierraconnect.protoexpress.com/t/adding-more-layers-to-pcb-stack-up/2997/4 "2025-03-17T23:35:46Z")

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Our designers will reply soon.

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**Author:** ![steve.carney](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/steve.carney/32/50_2.png) [@steve.carney](https://sierraconnect.protoexpress.com/u/steve.carney)\
**Post date:** [March 18, 2025, 5:07am UTC](https://sierraconnect.protoexpress.com/t/adding-more-layers-to-pcb-stack-up/2997/5 "2025-03-18T05:07:39Z")

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Yes, the price for 8 layer board is more than 6 layer board. If the board thickness is not changing with addition of two layers, then the core thicknesses will reduce.

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**Author:** ![Sajal\_ee](https://avatars.discourse-cdn.com/v4/letter/s/d26b3c/32.png) [@Sajal\_ee](https://sierraconnect.protoexpress.com/u/Sajal_ee)\
**Post date:** [March 18, 2025, 8:52am UTC](https://sierraconnect.protoexpress.com/t/adding-more-layers-to-pcb-stack-up/2997/6 "2025-03-18T08:52:36Z")

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Thank you for comment.

The board thickness will remain the same 1.6 mm. Only the dielectric core height is reduced to adjust two additional layers.