Backland Development
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Build a home for family in your garden in Welwyn Garden City

The first question for any family in Welwyn Garden City thinking about building in the garden is usually this: annexe or proper house? The answer turns on the person moving in, how long they’re likely to stay, and whether you might ever want to sell or let the building on its own.

An annexe is used with your home and usually tied to it by condition. A separate dwelling stands alone, with its own permission and potentially its own title. Welwyn Hatfield Borough Council assesses them on different terms, and council tax, CIL and VAT rules split along the same line. Our free plot appraisal sets out both, so you can decide with your family and your advisers.

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Single-storey garden home with wide glazed doors and a covered porch at the back of a family garden
Planning authority
Welwyn Hatfield Borough Council
Postcodes
AL6, AL7, AL8
Noon sun, 21 March
About 38°
Shadow from a 5 m eaves line
About 6.4 m
Planning plan
Local Plan
County
Hertfordshire

What the council will look at in Welwyn Garden City

A measured survey is where a family home in Welwyn Garden City stops being an idea and becomes a plan. We record boundaries, levels, trees, drains and the windows of your house and the houses next door, then test where the new building can sit. With the spring equinox sun standing near 38° at midday here, a 5 m eaves line throws a noon shadow close to 6.4 m; drawing that onto the survey shows which positions keep light in the main rooms of both homes. Welwyn Hatfield Borough Council will expect to see the same evidence with the application.

Section showing noon sun and shadows in Welwyn Garden City: about 38 degrees on 21 March and 15 degrees on 21 December21 m21 Mar, noon: sun 38°, shadow 6.4 m21 Dec, noon: sun 15°, shadow 19.0 mExistingNew home
This section is worked out for the latitude of Welwyn Garden City: around 38° of sun at midday in late March and about 15° at midwinter. It shows why the gap between your house and a new home behind it is about light as well as privacy. Garden assumed to face north.

From first call to decision

Here’s what happens next for a family home in Welwyn Garden City. You tell us about your plot and who the home is for, and we carry out a free desktop appraisal of access, space and the planning context. If it looks viable we visit, then set out the annexe and separate-home options. With your go-ahead we survey, design and give you a written quote, then prepare the application for Welwyn Hatfield Borough Council.

  1. 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.

  2. 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.

  3. 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.

  4. 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

  • Planning is the council’s decision, and an annexe is not a way round the rules that apply to a new house.
  • An annexe tied by planning condition usually can’t be sold or let separately, which limits flexibility later.
  • CIL exemptions are lost if work starts before the claim is made, and can be withdrawn if the home is sold or let within three years.

Your questions, answered for Welwyn Garden City

Do I need planning permission for a granny annexe in Welwyn Garden City?

Yes, almost always for a detached annexe with its own kitchen, bathroom and bedroom. Welwyn Hatfield Borough Council will treat it as accommodation linked to your home and will usually add a condition so it can’t be let or sold separately. A garden building used only as a home office or gym is a different matter, but sleeping and cooking take it beyond those allowances.

How much garden do I need for a family home in Welwyn Garden City?

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 Welwyn Hatfield Borough 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.

How long will building work disrupt my home in Welwyn Garden City?

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 Welwyn Garden City garden for my son or daughter?

Possibly, if the plot can work as a home in its own right. Welwyn Hatfield Borough 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 Welwyn Garden City

Family home in your garden near Welwyn Garden City

Find out what your garden could become

Free garden plot appraisal. No cost, no obligation, and a straight answer if it won’t work.

Get my free appraisal 0800 088 6248