# Principal Designer Registers

> The Principal Designer Registers carries 3 published figures read from 2 sources' own pages, from 100 to 360 GBP, read 28 October 2026.

Principal Designer Cost · https://principaldesignercost.co.uk/datasets/principal-designer-registers/ · computed 2026-10-28

**Range of the published figures:** 100 to 360 GBP (range 100 to 360 GBP; 3 published figures; 2 of 4 sources read publish one).

2 of the 4 named sources read in full publish a figure; 2 publish none, read 28 October 2026.

## By register

| Breakdown | Median | Range | Sources |
|---|---|---|---|
| register RIBA domestic application | 360 GBP | 360 to 360 GBP | 1 |
| register RIBA domestic annual | 120 GBP | 120 to 120 GBP | 1 |
| register ACA annual registration | 100 GBP | 100 to 100 GBP | 1 |

## Every figure, with its source

One row per source: the figure the source's own page publishes, the page, and the day it was read.

| Source | Figure | Breakdown | Read |
|---|---|---|---|
| [RIBA Principal Designer Register: join (2026 fees)](https://www.riba.org/explore/find-an-architect/principal-designer-register/join-principal-designer-register/) | 360 GBP + VAT | RIBA domestic application | 2026-10-28 |
| [RIBA Principal Designer Register: join (2026 fees)](https://www.riba.org/explore/find-an-architect/principal-designer-register/join-principal-designer-register/) | 120 GBP + VAT | RIBA domestic annual | 2026-10-28 |
| [ACA principaldesigner.uk register](https://www.principaldesigner.uk/) | 100 GBP | ACA annual registration | 2026-10-28 |

## The sentence each figure was read from (3)

- [RIBA Principal Designer Register: join (2026 fees)](https://www.riba.org/explore/find-an-architect/principal-designer-register/join-principal-designer-register/), read 2026-10-28: "application fee is £360 + VAT"
- [RIBA Principal Designer Register: join (2026 fees)](https://www.riba.org/explore/find-an-architect/principal-designer-register/join-principal-designer-register/), read 2026-10-28: "annual subscription fee is £120 + VAT"
- [ACA principaldesigner.uk register](https://www.principaldesigner.uk/), read 2026-10-28: "Quick and easy registration for £100 + per year; no joining fee"

## Read in full, publishes no figure

- [RIBA Principal Designer Register: search](https://www.riba.org/explore/find-an-architect/principal-designer-register/), read 2026-10-28: read in full and no accepted figure on the page
- [CIAT: principal designer registers](https://architecturaltechnology.com/resource/ciat-principal-designer-registers-now-have-over-30-registrants.html), read 2026-10-28: read in full and no accepted figure on the page

## Methodology

Every row is a verbatim sentence read from the named source's own page through our fetch service on the date shown, hash-pinned to the stored read (the sha of the page's visible text; the raw page is mirrored to R2). 2 of the 4 named sources that could be read published a usable figure; 2 published none and are recorded as not published, never filled in; 1 could not be read (blocked, dead or unreachable) and count nowhere. The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source for each breakdown it prices, in GBP (a source's median where its page yielded several accepted sentences for one breakdown), so a page that gives figures for several breakdowns gives one for each and N counts 3 figures, never sentences; 3 candidate sentence(s) were refused by a reviewer with the reason recorded. The fuller derivation this dataset is chartered to grow into (not yet what the figures above are; they are each source's own published figure as read): one row per register (body, who may join, domestic or full category, joining and annual fee, whether it is searchable) and the count of registrants each publishes

## Sources

- [RIBA Principal Designer Register: search](https://www.riba.org/explore/find-an-architect/principal-designer-register/) (the publisher's own terms; quoted for reporting and comment)
- [RIBA Principal Designer Register: join (2026 fees)](https://www.riba.org/explore/find-an-architect/principal-designer-register/join-principal-designer-register/) (the publisher's own terms; quoted for reporting and comment)
- [ACA principaldesigner.uk register](https://www.principaldesigner.uk/) (the publisher's own terms; quoted for reporting and comment)
- [CIAT: principal designer registers](https://architecturaltechnology.com/resource/ciat-principal-designer-registers-now-have-over-30-registrants.html) (the publisher's own terms; quoted for reporting and comment)
- [APS: Principal Designer Building Regulations register](https://www.aps.org.uk/about/aps-pdbr-register) (the publisher's own terms; quoted for reporting and comment)

## Cite or embed

- The Principal Designer Registers carries 3 published figures read from 2 sources' own pages, from 100 to 360 GBP, read 28 October 2026.
- 2 of the 4 named sources read in full publish a figure; 2 publish none, read 28 October 2026.
- Principal Designer Registers, register RIBA domestic application: median 360 GBP across 1 source, read 28 October 2026.
- Principal Designer Registers, register RIBA domestic annual: median 120 GBP across 1 source, read 28 October 2026.
- Principal Designer Registers, register ACA annual registration: median 100 GBP across 1 source, read 28 October 2026.

Cite as: "principaldesignercost.co.uk Principal Designer Registers", updated 2026-10-28, https://principaldesignercost.co.uk/datasets/principal-designer-registers/.

CSV: https://principaldesignercost.co.uk/datasets/principal-designer-registers.csv
JSON: https://principaldesignercost.co.uk/datasets/principal-designer-registers.json
Embed (plain HTML, static link back): see https://principaldesignercost.co.uk/datasets/principal-designer-registers/#median