Help With Planning
Caravan Act, PD & Full Planning Explained

Granny Annexe Planning Permission in
Caernarfon

Caernarfon properties that are listed, in a conservation area, or already flats typically lose permitted development rights that would otherwise apply to a garden annexe, meaning a full application becomes the only realistic route.

Get Your Free Route Check
Local to Caernarfon
Three Routes Explained
Council-Ready Applications

The Caernarfon Granny Annexe Planning Position

A granny annexe in Caernarfon can follow three genuinely different routes. A structure that meets the legal definition of a caravan under the Caravan Sites Act 1968, capable of being moved by road in one or two sections and within maximum dimensions of 20 metres by 6.8 metres with an internal height of 3.05 metres, can often be sited without planning permission provided it remains ancillary to the house.

An outbuilding used incidentally to the enjoyment of the house, a home office, gym, or storage, can fall under Class E permitted development, but the moment it includes genuine sleeping accommodation used independently, it’s no longer considered incidental, and permitted development stops applying.

Where neither route fits, a full planning application is the reality for Caernarfon properties, and we confirm this honestly rather than assume. A Caernarfon annexe needing full planning permission usually needs both, our Building Regulations drawings in Caernarfon service covers the technical compliance side, and our structural calculations in Caernarfon service covers the engineering detail.

Right Route Confirmed

Caravan Act, permitted development, or full planning

Caravan Act Route

Movable structures that may need no permission at all

PD Size & Siting

Permitted development limits checked properly

Council-Ready

Applications built to be approved

Granny annexe planning permission

How We Help in Caernarfon

Every Caernarfon annexe enquiry starts with the same honest question, mobile caravan, incidental outbuilding, or genuine separate dwelling, since the answer determines everything that follows.

From there, we confirm the correct route for your Caernarfon project and prepare exactly what’s needed, a Lawful Development Certificate or a full planning application.

Structural detail and building regulations compliance for Caernarfon annexes are handled properly throughout, not bolted on at the end.

Honest Annexe Advice For Caernarfon

We tell Caernarfon families honestly whether their annexe genuinely qualifies for the Caravan Act or permitted development routes, rather than defaulting every enquiry to a full application.

Getting the self-containment question right matters more than almost anything else for a Caernarfon annexe, and we assess this honestly rather than assume either way.

Structural and building regulations detail is built into every Caernarfon annexe project from the start, whichever planning route applies. If you need help with a granny annexe, give us a call on 0330 133 5316 or fill in the form below.

Free Route Check

Get Your Free Route Check

Common Annexe Planning Questions in Caernarfon

What determines if my Caernarfon annexe needs planning permission?

This genuinely depends on your specific plans for Caernarfon, we check whether the structure is mobile, incidental, or self-contained before advising either way.

What size limits apply to a caravan-style annexe in Caernarfon?

The Caravan Sites Act 1968 sets the limits, 20 metres long, 6.8 metres wide, 3.05 metres internal height, and the structure must be moveable by road in one or two sections, we check whether your Caernarfon plans genuinely meet this.

What outbuilding rules apply to a Caernarfon annexe?

It depends on genuine use, an incidental Caernarfon outbuilding can qualify under Class E, but introducing real sleeping accommodation used independently takes it outside permitted development regardless of size.

What makes an annexe a separate dwelling in Caernarfon?

Genuine independence is the test in Caernarfon, if the annexe could function as a separate home on its own, full planning permission is almost always the realistic route.

Is a Lawful Development Certificate worth it in Caernarfon?

Strongly recommended for Caernarfon annexes, an assumption that a structure qualifies isn’t the same as formal confirmation, and a Lawful Development Certificate closes that gap.

Can you manage everything for my Caernarfon annexe project?

Yes, we coordinate every part of a Caernarfon annexe project, from establishing the correct route through to building regulations sign-off, so nothing falls through the gap.