For party wall & building surveyors

Every notifiable job, the day it's validated

Extensions, lofts and basements trigger the Party Wall Act long before work starts. PlanNexus surfaces each one near your offices the day the council validates it — as an email digest or a raw CSV feed for your own mailing.

Set up free alerts See how it works

Free tier — 1,000 requests/month, 10 saved alerts. No card required.

What surveyors do today

Pay £179–289/month to a leads portal that bundles the data inside done-for-you letters — their branding rules, per-letter fees on top, and the underlying list locked in. At serious volume that model costs four figures a month and you still can't export your own pipeline.

What you get with PlanNexus

The raw applications: address, description, validated date and a link to the council record, filtered to a radius around each office. Mail the building owner, the adjoining owners, or both — your letterhead, your envelopes, your cost per stamp.

A feed, not a walled garden

Daily CSV via one API call: lat/lng radius around each office, validated in the last 24 hours, householder types only. Councils that don't publish a validated date fall back to the received date, so the feed never silently drops a borough. Pull it straight into your mail-merge or CRM.

What lands in your inbox

Daily or weekly digest. One email, scannable in 30 seconds.

PlanNexus Alert

4 new applications matching “extension”

2026/1842/HSE27 Apr 2026

14 Elmfield Road, Balham

Erection of single-storey rear extension and excavation to enlarge basement with lightwell to front. Associated internal alterations.

26/01193/HAPP27 Apr 2026

9 Cranbrook Park, Wood Green

Loft conversion including rear dormer and rooflights to front elevation. Single-storey side infill extension.

DC/26/8851726 Apr 2026

42 Avondale Gardens, Ilford

Single-storey rear extension with depth of 4.5m, height 3m. Demolition of existing conservatory.

2026/0967/P25 Apr 2026

8 Mortimer Crescent, Kilburn

Excavation of basement beneath existing dwelling including front lightwell; two-storey rear extension following demolition of existing outrigger.

Sample shown — your real digest is filtered to your patch and keywords.

Three minutes to set up

Step 1

Tell us your patch

Postcode area or council, plus the keywords that matter —"extension" works as a starting point.

Step 2

We watch every council

360+ UK planning authorities scraped continuously. New applications land in our index within hours of being filed.

Step 3

Email lands in your inbox

Daily or weekly digest of every new application matching your filters. No login required to read it.

Set up your first alert — free See council coverage

Common questions

How is this different from a party-wall leads portal?: Portals sell you their letters: their branding, per-letter fees, and no export of the underlying list. PlanNexus sells you the data itself — every relevant application with its address, description, dates and council link — and you run the mailing you already know converts. At a few hundred letters a week the difference is thousands of pounds a month.
Can I filter around each of my offices?: Yes. Email alerts filter by postcode prefixes or councils. The CSV/API feed goes further: a metre-radius circle around any lat/lng — one call per office, or one wide call covering all of them.
Why does the validated date matter?: Received applications can sit invalid for weeks; validation is the signal the project is real and progressing — the right moment for a party-wall letter. Filter on validated-in-the-last-24-hours for a clean daily run. Where a council doesn't publish a validated date we fall back to the received date rather than dropping the area from your feed.
Does it cover adjoining owners as well as building owners?: We give you the application address and full description, so you can write to the building owner, the neighbours either side, or both — that targeting is your call. (We deliberately don't pad records with guessed neighbour addresses.)
What volume should I expect?: Depends on radius and patch. A dense London borough validates hundreds of householder applications a month; a 2km circle around one office is typically a few dozen a week. Sign up free and run the search to size your patch before paying anything.
What does it cost?: Free covers 10 saved alerts by email. Alerts Pro (£19/mo) lifts that to 50 and adds CSV download of your matches. For the programmatic daily feed — radius + validated-date filters via the API — Starter at £99/mo covers a multi-office operation comfortably.

Worth a 3-minute setup?

Free tier covers most patches. Upgrade only if you outgrow it.

Create free account

Every notifiable job, the day it's validated

Free tier — 1,000 requests/month, 10 saved alerts. No card required.

What lands in your inbox

Daily or weekly digest. One email, scannable in 30 seconds.

PlanNexus Alert

4 new applications matching “extension”

2026/1842/HSE27 Apr 2026

14 Elmfield Road, Balham

Erection of single-storey rear extension and excavation to enlarge basement with lightwell to front. Associated internal alterations.

26/01193/HAPP27 Apr 2026

9 Cranbrook Park, Wood Green

Loft conversion including rear dormer and rooflights to front elevation. Single-storey side infill extension.

DC/26/8851726 Apr 2026

42 Avondale Gardens, Ilford

Single-storey rear extension with depth of 4.5m, height 3m. Demolition of existing conservatory.

2026/0967/P25 Apr 2026

8 Mortimer Crescent, Kilburn

Excavation of basement beneath existing dwelling including front lightwell; two-storey rear extension following demolition of existing outrigger.

Sample shown — your real digest is filtered to your patch and keywords.

Three minutes to set up

Step 1

Tell us your patch

Postcode area or council, plus the keywords that matter —"extension" works as a starting point.

Step 2

We watch every council

360+ UK planning authorities scraped continuously. New applications land in our index within hours of being filed.

Step 3

Email lands in your inbox

Daily or weekly digest of every new application matching your filters. No login required to read it.

Set up your first alert — free See council coverage

Common questions

How is this different from a party-wall leads portal?

Portals sell you their letters: their branding, per-letter fees, and no export of the underlying list. PlanNexus sells you the data itself — every relevant application with its address, description, dates and council link — and you run the mailing you already know converts. At a few hundred letters a week the difference is thousands of pounds a month.

Can I filter around each of my offices?

Yes. Email alerts filter by postcode prefixes or councils. The CSV/API feed goes further: a metre-radius circle around any lat/lng — one call per office, or one wide call covering all of them.

Why does the validated date matter?

Received applications can sit invalid for weeks; validation is the signal the project is real and progressing — the right moment for a party-wall letter. Filter on validated-in-the-last-24-hours for a clean daily run. Where a council doesn't publish a validated date we fall back to the received date rather than dropping the area from your feed.

Does it cover adjoining owners as well as building owners?

We give you the application address and full description, so you can write to the building owner, the neighbours either side, or both — that targeting is your call. (We deliberately don't pad records with guessed neighbour addresses.)

What volume should I expect?

Depends on radius and patch. A dense London borough validates hundreds of householder applications a month; a 2km circle around one office is typically a few dozen a week. Sign up free and run the search to size your patch before paying anything.

What does it cost?

Free covers 10 saved alerts by email. Alerts Pro (£19/mo) lifts that to 50 and adds CSV download of your matches. For the programmatic daily feed — radius + validated-date filters via the API — Starter at £99/mo covers a multi-office operation comfortably.