- Planning authority
- Cornwall Council
- Postcodes
- TR1
- Noon sun, 21 March
- About 40°
- Shadow from a 5 m eaves line
- About 6.0 m
- Planning plan
- Local Plan
- County
- Cornwall
Before you decide in Truro
Cornwall Council will judge a family home against the council’s Local Plan and any guidance it has adopted on garden development and annexes. Some councils spell out how closely an annexe must relate to the main house, such as sharing the drive, garden or parking, and what turns a building into a separate home instead. We read the current policies for your address before design starts, because a scheme drawn to suit the wrong test wastes time and money. Where the position is unclear, the council’s pre-application advice can be worth its fee.
From first call to decision
The next step is a conversation, by phone or through the form, about your garden in Truro and who the new home is for. We check access, title, the main planning constraints and any CIL position for your address, then tell you whether an annexe, a separate home or neither looks realistic. If neither does, we’ll say so and explain why.
Free plot appraisal
We look at your plot, access and the planning picture from the desk, talk through who will live in the new home, and visit if it looks viable. There’s no cost and no obligation.
Annexe or separate home
We set out both routes for your plot, covering what each means for planning, ownership, council tax, CIL and VAT, so you can decide with your family and advisers before design starts.
Survey and design
A measured survey, then a design built around the person moving in: step-free routes, a ground-floor bedroom if needed and privacy for both households. You get a written quote after design and survey.
Build and handover
We build while you carry on living next door, with access, deliveries and working hours agreed up front. At handover you get the completion certificate and the paperwork you’ll need for council tax, lenders and any VAT claim.
Worth checking early
- An annexe tied by planning condition usually can’t be sold or let separately, which limits flexibility later.
- Planning is the council’s decision, and an annexe is not a way round the rules that apply to a new house.
- Family plans change: agree ownership, costs and what happens if circumstances change in writing, with a solicitor.
Questions about garden plots in Truro
How much garden do I need for a family home in Truro?
There’s no fixed figure. A single-storey annexe close to the house can work on a smaller plot than a separate dwelling, which needs its own garden, parking and access. What matters is whether Cornwall Council can be satisfied on privacy, daylight and the space left for both homes. The free appraisal gives you a first view based on your plot’s actual shape and access.
Will an annexe in Truro put up my council tax?
It might. Annexes can be banded separately, but exemptions exist for annexes lived in by certain dependent relatives, and in some cases a discount applies where family live there or the annexe is used as part of the main home. Who qualifies depends on the relative’s circumstances and how the annexe is used. Cornwall Council’s council tax team can tell you how the rules apply to your household.
How long will building work disrupt my home in Truro?
A single garden home usually takes several months on site, with the noisiest work, such as groundworks, drainage and heavy deliveries, concentrated near the start. We agree working hours, access and parking with you up front, and with the people next door where it affects them, so your household knows what each week will look like.
Can I build a separate house in my Truro garden for my son or daughter?
Possibly, if the plot can work as a home in its own right. Cornwall Council will look at access, parking, garden space for both houses, privacy and the character of the street, as it would for any new house. If permission is granted, the plot can be transferred to your child with its own title, with your lender’s consent if the house is mortgaged.
Other options in Truro
- Build a new home in your garden
- Planning promotion for your garden plot
- Garden plot option agreement
- Joint venture on your garden plot
- Corner and side plots
- Large rear gardens

