Planning Permission for Windows, Doors and Conservatories in Nottingham

Planning permission and building regulations are two different things, and new windows can touch both. Planning is about how the outside of your home looks. Building regulations are about how the work performs: heat loss, safety glass, fire escape and fresh air.

Replacing Windows and Doors on a House

Houses come with a set of permitted development rights, which let you carry out some work without applying for planning permission. Window and door replacement is one of them. The Planning Portal says you don't usually need permission for windows and doors "of a similar appearance" to those used in the construction of the house.

That covers most jobs, such as new white uPVC casements in place of old white ones. If the new windows would look quite different, ask the council's planning team before you order.

Two jobs fall outside the simple rule:

• A new bay window. Adding a bay where there wasn't one is treated as an extension, and it may need permission.
• New side windows upstairs. A new window in a side wall above the ground floor must be obscure-glazed. It also has to be non-opening, unless the part that opens is more than 1.7 m above the floor inside.

A house that has lost these rights, through a planning condition or an Article 4 direction, may need permission for window work that would otherwise go ahead without one. The conservation area section explains how that works here.

Flats and Maisonettes

Flats and maisonettes have no householder permitted development rights at all. The national rules define a house in a way that leaves out any building containing flats, and any flat inside one. So the similar-appearance rule above doesn't apply.

That doesn't mean every new window in a flat needs an application. The Planning Portal says identical, like-for-like replacements shouldn't need permission. A new glazing pattern or a change of size may. The Planning Portal also warns that local policy and interpretation "varies from council to council".

So if you live in a flat, ask the council before you sign for anything that won't match the existing windows exactly. This matters in parts of the city where many homes are flats, including The Park Estate and the Lace Market.

Conservation Areas

A conservation area is a place the council has chosen to protect for its special character. Being in one doesn't, on its own, take away a house's right to fit similar-looking windows. What changes things is an Article 4 direction.

What an Article 4 Direction Does

An Article 4 direction is an order made by the council that removes some permitted development rights from particular properties. Once it's in force, work that would normally go ahead without an application, such as changing windows or doors, can need planning permission. Historic England puts it this way: permission "may also be required if permitted development rights have been removed through an Article 4 Direction".

Nottingham City Council lists six Article 4 directions that affect work on homes: Devonshire Promenade, Waterloo Promenade, Wellington Terrace, Strelley Village, Sneinton and Foxhall Road.

None of those six covers any of the areas on this site. If you're unsure whether a direction applies to your home, the council's planning team can check a single address for you.

The City's Guidance on Windows

Where planning control does apply, the council has published what it wants to see. Its 2025 guidance for conservation areas, under the heading Windows, says: "Replacement of original windows should be like-for-like in design and material." It adds that sash windows should replace sash windows, and it names the materials: "Materials may be timber hardwood, timber softwood, or timber-effect UPVC."

That last line is the most useful local fact on this site. uPVC isn't banned outright in a city conservation area where planning control applies, but it has to look like timber. Our sash windows page covers timber sashes, uPVC sashes made to look like timber and slim heritage double glazing.

Nottingham's 33 Conservation Areas

Nottingham City has 33 conservation areas. The ones that touch the pages on this site include The Park, Lace Market, Castle, Sherwood Rise, Mapperley Park and Alexandra Park, Arboretum, Wollaton Park, Wollaton Village, Sutton Passey, Bulwell, Clifton Village and Basford Hall. The council's conservation areas page has the full list.

Mapperley itself is split between Nottingham City Council and Gedling Borough Council, so check which council covers your street. Mapperley Park is a different place, and it's in the city.

Outside the City Boundary

Much of the area around Nottingham sits in other councils: Rushcliffe, Gedling, Broxtowe and Ashfield in Nottinghamshire, and Erewash in Derbyshire. There are conservation areas in Ruddington, Bingham, Keyworth, Calverton, Gedling Village, Beeston, Stapleford, Eastwood, Hucknall, Long Eaton and Ilkeston. There are none in West Bridgford, Radcliffe on Trent, Arnold, Carlton or Burton Joyce.

Rushcliffe's 2022 appraisal for Ruddington is blunt about why windows matter: "The use of PVC doors and windows are the most common cause of loss of character on unlisted buildings." If you live in one of these districts, check with that council before work starts. Its planning team can tell you whether any restriction applies to your street.

Listed Buildings

Listed buildings follow stricter rules than anywhere else. Historic England says replacing windows in a listed building "will always require" listed building consent, and that inserting double or triple glazing into historic windows "will usually require" it.

Nottingham City Council's 2025 guidance is firm about materials too: "Only timber will be accepted for replacing existing timber". So a timber-effect uPVC window, which the guidance accepts in some conservation area cases, isn't an option where a listed building in the city has timber windows now.

Doing the work without consent is a criminal offence under section 9 of the Planning (Listed Buildings and Conservation Areas) Act 1990.

There's some give on the energy side. Approved Document L accepts that some listed and historic windows can't meet the usual standard without harming the building's character. In those cases it allows a centre-pane U-value of 1.2 W/m²K, or low-emissivity secondary glazing, instead.

The Park Estate

The Park Estate holds about 450 houses and 700 flats. Its layout is the work of Thomas Chambers Hine, from the 1850s, and it has been a conservation area since 1969. There are 93 entries for it on the National Heritage List for England.

The windows are a big part of why. The appraisal for the area picks out timber sliding sashes, Tudor-revival mullioned windows and a notable collection of stained glass. The streets are still lit by gas.

The estate is managed by Nottingham Park Estate Ltd, owned by residents since 1986 and working under the Nottingham Park Estate Act 1990. It looks after the roads and common areas. Nottingham City Council is still the planning authority.

For windows, three points apply:

• The flats. With around 700 flats on the estate, a large share of homes here have no permitted development rights. Changing their windows can need planning permission, as the flats section above explains.
• The houses. They're in a conservation area, and the city's guidance asks for like-for-like replacements, with timber or timber-effect uPVC. Some are listed, and listed homes need consent for any window replacement.
• The estate itself. The Park Estate Office reviews planning applications made in the area. Homeowners should check their title deeds and can ask the Park Estate Office whether anything applies to their property.

Our The Park Estate page covers the area in more detail.

Secondary Glazing

Secondary glazing is a second pane fitted inside the existing window, leaving the original frame and glass in place.

Historic England says reversible secondary glazing "does not generally need listed building consent". The Planning Portal says you won't usually need planning permission to add internal secondary glazing to a flat.

It works well, too. Historic England says it "can reduce heat loss as effectively as double glazing, particularly if low emissivity glass is used, and is even better than double glazing at reducing noise".

So it usually needs no planning permission or listed building consent. That's not the same as saying it's outside building regulations, so ask the installer how the rules apply to your job. If it goes on a window that serves as a fire escape, the inner pane must open too, so the escape route still works. Our secondary glazing section has more.

Conservatories

A conservatory counts as an extension for planning. On a house, most fall within permitted development if they stay inside these limits:

• Rear conservatory: up to 3 m beyond the original rear wall, or 4 m on a detached house, and no more than 4 m high. Larger rear extensions of 6 m or 8 m can go through a prior approval process, but not in a conservation area.
• Near a boundary: eaves no higher than 3 m within 2 m of it.
• Garden cover: no more than half the land around the original house covered by additions.
• Side conservatory: single storey, no wider than half the original house, and not allowed in a conservation area at all.

Flats and maisonettes have no permitted development rights, so any conservatory on a flat needs permission. The usual rule that materials must match the house doesn't apply to the conservatory itself.

Building regulations work differently. Approved Document L exempts a conservatory from the energy rules if it's at ground level and has a floor area that does not exceed 30 m². Its glazing must also meet the safety glass rules. The wall, door or window between it and the house must be kept, or replaced if removed, and the home's heating system must not be extended into it.

Two changes can end that exemption. The Planning Portal says any new structural opening between the conservatory and the house needs building regulations approval, even when the conservatory itself is exempt. And LABC says a solid replacement conservatory roof that greatly cuts the amount of glazing can end the exempt status. Our conservatories page covers both, and our conservatory costs guide shows what each option costs.

Building Regulations for Replacement Windows and Doors

The Planning Portal says building regulations have applied to all replacement glazing since 1 April 2002. Replacing a whole window or door, frame included, is building regulations work. Replacing only the glass, or a sealed unit in its existing frame, is not. So swapping a misted unit needs no building regulations sign-off. That's about glass in an existing frame, not a blanket rule for every repair.

The Certificate

Six government-authorised schemes let registered installers sign off their own replacement windows and doors: Assure, Blue Flame, CERTASS, Certsure, FENSA and NAPIT. The installer must give you a certificate and tell the council about the work within 30 days of finishing. Ask for the FENSA, CERTASS or other scheme certificate before you pay the final bill.

If the installer isn't registered with a scheme, the job goes through the council's building control team instead. Work done without either route can later be put right through a regularisation certificate from the council. GOV.UK warns that without approval "you will not have the certificates of compliance you may need when you want to sell your home".

What the Windows Must Meet

• Heat loss: replacement windows need a U-value of 1.4 W/m²K or a Window Energy Rating of band B. Doors more than 60% glazed need 1.4 or a Doorset Energy Rating of band C, and other doors 1.4 or band B. An A rating is not a legal requirement.
• Mostly solid doors: a replacement external door that's no more than 50% glazed needs no building notice, but it still has to meet the heat loss standard.
• Fire escape: an escape window needs an openable area of at least 0.33 m², at least 450 mm high and 450 mm wide, with the bottom of the opening no more than 1,100 mm above the floor. A replacement must give "at least the same potential for escape" as the window it replaces.
• Safety glass: it's needed in glass below 800 mm in walls and windows, in doors and side panels up to 1,500 mm, and in side panels within 300 mm of a door.
• Ventilation: if the old windows had trickle vents, the new ones need vents that are no smaller and can be controlled. Where the old windows had no vents, Approved Document F says ventilation must be "no worse than it was before".

Escape windows aren't needed everywhere. They apply to habitable rooms other than kitchens on the ground floor, and to rooms on upper storeys up to 4.5 m above ground that are served by one stair without a protected stairway.

General Information, Not Advice

This is general information, not planning advice. Check with your council's planning team before work starts. The same goes for building regulations: your council's building control team, or the installer's scheme, can confirm what applies to your job.

Nottingham Double Glazing is an enquiry service, not an installer. Your enquiry goes to an independent local installer, who surveys the job and quotes you direct, and who may pay us for the introduction. We don't make, supply, survey or fit windows, doors or conservatories, and we don't inspect, approve or check the installer. The checks to make before you sign are in our how to choose an installer guide.