House extensions in North Hertfordshire

North Hertfordshire received 819 householder applications in the last 12 months - about 16 a week. Rear extensions and garage works are the most common. Of the 668 decided so far, 611 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

Date received
Get alerts for North Hertfordshire

Filter applications

Date receivedLast 90 days
Date receivedLast 90 days
Select one year, or two for a range.
Number of homesAny
StatusAny
Application routeAny
Application type1 selected
KeywordsNone
Match

Matches words or phrases in the application address and description.

Showing 50 of 211 applications
Yesterday Registered 26/02617/FPH

3 The Finches Hitchin Hertfordshire SG4 9PB

Two storey side extension, replace existing ground floor bay window and alterations to existing fenestration following demolition of existing shed.

Full Permission Householder North Hertfordshire
2 days ago Registered 26/02562/FPH

10 Walnut Way Ickleford Hitchin Hertfordshire SG5 3XT

Single storey side extension following demolition of existing garage. Installation of additional front hardstanding.

Full Permission Householder North Hertfordshire
23 Oct 2026 Registered 26/02568/FP

Royston Leisure Centre Woodcock Road Royston Hertfordshire SG8 7XT

Erection of a single-storey learner pool extension to the east elevation of Royston Leisure Centre, including changing facilities, filtration plant an...

Full Planning Permission North Hertfordshire
23 Oct 2026 Registered 26/02559/FPH

52 Heron Way Royston Hertfordshire SG8 7XH

Single storey rear / side extension following removal of existing conservatory

Full Permission Householder North Hertfordshire
22 Oct 2026 Registered 26/02498/FPH

Latimers 51 London Road Hitchin Hertfordshire SG4 9EW

Erection of detached carport

Full Permission Householder North Hertfordshire
21 Oct 2026 Registered 26/02614/FPH

41 Bowershott Letchworth Garden City Hertfordshire SG6 2ET

Single storey side and rear extensions. Rear hard landscaping.

Full Permission Householder North Hertfordshire
21 Oct 2026 Registered 26/02503/FPH

55 Codicote Road Codicote Welwyn Hertfordshire AL6 9TY

Erection of car port

Full Permission Householder North Hertfordshire
20 Oct 2026 Registered 26/02484/LBC

1 High Street Kimpton Hitchin Hertfordshire SG4 8RA

Replace 5 no. single-glazed leaded-light windows to front elevation with timber, double-glazed, casement windows.

Listed Building Consent North Hertfordshire
20 Oct 2026 Registered 26/02686/FPH

2 Gosling Avenue Offley Hitchin Hertfordshire SG5 3ER

Single storey front, rear and side extension to include conversion of existing garage and store into habitable accommodation.

Full Permission Householder North Hertfordshire
20 Oct 2026 Registered 26/02524/FPH

7 Newlands Letchworth Garden City Hertfordshire SG6 2JE

Installation of roof lights to existing side roof slopes and dormer window to existing rear roof slope to facilitate conversion of loft space into hab...

Full Permission Householder North Hertfordshire
19 Oct 2026 Registered 26/02496/FPH

36 Beech Way Blackmore End St Albans Hertfordshire AL4 8LY

Single storey front extension. Canopy roof over existing porch. Alterations to fenestration including infill of two no. ground floor side windows

Full Permission Householder North Hertfordshire
16 Oct 2026 Registered 26/02428/FPH

77 Benslow Lane Hitchin Hertfordshire SG4 9RA

Erection of detached garage. Installation of front boundary wall and railings following removal of existing railings. Alteration to existing access ar...

Full Permission Householder North Hertfordshire
16 Oct 2026 Registered 26/02350/FPH

1 New Close Knebworth Hertfordshire SG3 6NU

Two storey side extension following demolition of existing porch. Insertion of front and rear dormer windows to facilitate conversion of loft space to...

Full Permission Householder North Hertfordshire
16 Oct 2026 Registered 26/02494/FPH

31 Kershaws Hill Hitchin Hertfordshire SG4 9AQ

Insertion of L shaped rear dormer with two Juliet balconies and 2 no. rooflights to front roofslope to facilitate loft conversion

Full Permission Householder North Hertfordshire
15 Oct 2026 Registered 26/02489/LBC

Old Manor House Shaftenhoe End Bogmoor Road Barley Royston Hertfordshire SG8 8LE

Underpinning to existing walls and installation of a steel frame as part of remedial structural works

Listed Building Consent North Hertfordshire
14 Oct 2026 Registered 26/02626/LBC

22 London Road Royston Hertfordshire SG8 9EJ

Form a 1000mm-wide opening incorporating a segmental arch between the dining room and adjoining TV room to match the existing hallway archway.

Listed Building Consent North Hertfordshire
14 Oct 2026 Registered 26/02619/FPH

18 Mount Keen Great Ashby Stevenage Hertfordshire SG1 6BP

Replacement of the existing rear patio, levelling rear garden beyond patio area with associated retaining walls and steps, erection of a timber gazebo...

Full Permission Householder North Hertfordshire
14 Oct 2026 Registered 26/02618/LDCP

25 Lomond Way Great Ashby Stevenage Hertfordshire SG1 6AJ

Single storey rear extension, replace existing garage door with a window to facilitate conversion into habitable accommodation and erection of front p...

Lawful Development Certificate Proposed North Hertfordshire
14 Oct 2026 Registered 26/02387/FPH

The Pump House Royston Road Barkway Royston Hertfordshire SG8 8BX

Side extension to existing ancillary annex

Full Permission Householder North Hertfordshire
14 Oct 2026 Registered 26/02335/FPH

9 Whitethorn Lane Letchworth Garden City Hertfordshire SG6 2DN

Single storey rear infill extension and alterations to fenestration following demolition of existing rear conservatory.

Full Permission Householder North Hertfordshire
14 Oct 2026 Registered 26/02399/LBC

Sun Hill Cottage 3 Sun Hill Royston Hertfordshire SG8 9AU

Replace existing timber front door with a new purpose-made timber door closely matching the existing except for introducing slimlite double-glazing to...

Listed Building Consent North Hertfordshire
14 Oct 2026 Registered 26/02398/LBC

Sun Hill Cottage 3 Sun Hill Royston Hertfordshire SG8 9AU

Replace 6no. timber casement windows (3no. front dormer windows and 3no. on side elevation) with timber, double-glazed casements with like-for-like gl...

Listed Building Consent North Hertfordshire
13 Oct 2026 Registered 26/02608/LDCP

9 Stile Plantation Royston Hertfordshire SG8 9HR

Single storey rear extension

Lawful Development Certificate Proposed North Hertfordshire
13 Oct 2026 Registered 26/02340/FP

9 Walsworth Road Hitchin Hertfordshire SG4 9SP

Change of use of the existing attached annexe from business use (Class E) to 1-bed ancillary annexe to main dwelling (Class C3). Alterations to fenest...

Full Planning Permission North Hertfordshire
13 Oct 2026 Registered 26/02381/FPH

6 Collison Close Hitchin Hertfordshire SG4 0RE

Single storey rear extension and first floor side extension over existing garage following demolition of existing conservatory. Insertion of front gro...

Full Permission Householder North Hertfordshire
13 Oct 2026 Registered 26/02386/LBC

Greenbury London Road Barley Royston Hertfordshire SG8 8JF

Rethatch in long straw including replacing block pattern ridge with a flush ridge.

Listed Building Consent North Hertfordshire
12 Oct 2026 Registered 26/02407/FPH

26 Harkness Way Hitchin Hertfordshire SG4 0QL

Insertion of rear dormer window and alterations to rear and side fenestration

Full Permission Householder North Hertfordshire
12 Oct 2026 Registered 26/02275/FP

Field Off The B656, North Of Mansells Lane Codicote Hertfordshire SG4 9TJ

Installation of hard standing and creation of vehicular access off Hitchin Road following closure of existing field access.

Full Planning Permission North Hertfordshire
12 Oct 2026 Registered 26/02364/FP

Lower Titmore Farm Lower Titmore Green Little Wymondley Hitchin Hertfordshire SG4 7JT

Change of use and conversion of barn to provide one residential dwelling including alterations to fenestration and installation of hardstanding.

Full Planning Permission North Hertfordshire
12 Oct 2026 Registered 26/01806/FPH

72 Kimpton Road Blackmore End St Albans Hertfordshire AL4 8LX

Single storey rear infill extension and alterations to rear ground floor fenestration (Development already carried out).

Full Permission Householder North Hertfordshire
9 Oct 2026 Registered 26/02423/LBC

The Glade The Glade Letchworth Garden City Hertfordshire SG6 3LN

Replace existing single-glazed, crittall leaded-light windows throughout (apart from windows 1, 6, 19-21) retaining the existing timber subframes, wit...

Listed Building Consent North Hertfordshire
9 Oct 2026 Registered 26/02413/FPH

2 Anchor Road Baldock Hertfordshire SG7 6LG

Single storey front/side extension and alterations to fenestration. Installation of entrance gates and boundary fencing.

Full Permission Householder North Hertfordshire
9 Oct 2026 Registered 26/02409/FPH

Yew Tree House Police Row Therfield Royston Hertfordshire SG8 9PN

Single storey rear extension following demolition of existing detached garage. Erection of gabled dormer to rear roof slope. Insertion of first floor ...

Full Permission Householder North Hertfordshire
8 Oct 2026 Registered 26/02391/FPH

20 West Hill Hitchin Hertfordshire SG5 2HZ

Single storey rear extension to existing garage, insertion of rear dormer and 2 no.roof lights to front roofslope to facilitate loft conversion, first...

Full Permission Householder North Hertfordshire
8 Oct 2026 Registered 26/02341/FPH

20 Grange Bottom Royston Hertfordshire SG8 9UQ

Single storey rear extension following demolition of existing conservatory.

Full Permission Householder North Hertfordshire
7 Oct 2026 Registered 26/02550/LDCP

48 Whitehill Road Hitchin Hertfordshire SG4 9HP

Single storey rear extension and alteration to opening on side elevation

Lawful Development Certificate Proposed North Hertfordshire
7 Oct 2026 Registered 26/02395/LDCP

49 Webb Close Letchworth Garden City Hertfordshire SG6 2TY

Single storey rear extension with flat roof and lantern.

Lawful Development Certificate Proposed North Hertfordshire
7 Oct 2026 Registered 26/02368/LBC

1A Hitchin Street Baldock Hertfordshire SG7 6AE

Installation of external front canopy and internal counter fit out.

Listed Building Consent North Hertfordshire
7 Oct 2026 Registered 26/02367/FP

1A Hitchin Street Baldock Hertfordshire SG7 6AE

Installation of external front canopy.

Full Planning Permission North Hertfordshire
6 Oct 2026 Registered 26/02530/FPH

53 Manton Road Hitchin Hertfordshire SG4 9NP

Alterations to rear garden levels, associated steps and alterations to retaining walls (development commenced).

Full Permission Householder North Hertfordshire
6 Oct 2026 Registered 26/02525/FPH

2 Poplar Drive Royston Hertfordshire SG8 7HU

Two storey side extension following demolition of existing garage and rear element. Alterations to existing fenestration.

Full Permission Householder North Hertfordshire
6 Oct 2026 Registered 26/02339/FPH

38 Echo Hill Royston Hertfordshire SG8 9BB

Single storey rear extension and alterations to existing fenestration following demolition of conservatory.

Full Permission Householder North Hertfordshire
6 Oct 2026 Registered 26/02266/LDCLB

14 St Albans Road Codicote Hitchin Hertfordshire SG4 8UT

Remove painted roughcast render from north elevation gable leaving hard cement substrate. Re-render in two coats NHL 2 lime render with a wood float f...

Lawful Development Cert Listed Building North Hertfordshire
5 Oct 2026 Registered 26/02511/FPH

77 Benslow Lane Hitchin Hertfordshire SG4 9RA

Two storey rear and side extension following demolition of existing conservatory. Insertion of front and rear rooflights. Replacement roof to existing...

Full Permission Householder North Hertfordshire
5 Oct 2026 Approved 27 Oct 26/02352/NMA

11 Kingswood Avenue Hitchin Hertfordshire SG4 0PA

Minor alterations to the position, size and arrangement of window and door openings, including revisions to the front and side elevations, together wi...

Non-Material Amendment North Hertfordshire
2 Oct 2026 Registered 26/02493/FPH

42 Heathfield Road Hitchin Hertfordshire SG5 1TB

Side and rear extension. Insertion of front and rear dormer windows and front rooflights to facilitate additional accommodation at first floor level f...

Full Permission Householder North Hertfordshire
2 Oct 2026 Approved 20 Oct 26/02034/LDCE

Long Valley Dark Lane Codicote Hitchin Hertfordshire SG4 8UZ

Continued use of first floor above garage as habitable accommodation

Lawful Development Certificate Existing North Hertfordshire
1 Oct 2026 Registered 26/02289/FPH

100 Whinbush Road Hitchin Hertfordshire SG5 1PN

Alterations to fenestration to the front, rear and side elevations. Installation of a vehicular crossover and paved driveway.

Full Permission Householder North Hertfordshire
1 Oct 2026 Registered 26/01884/FP

Small Gains Recreation Ground Small Gains Lane Station Road Ashwell Baldock SG7 5LT

Erection of detached outbuilding ancillary accommodation to Ashwell Academicals Youth Football Club including toilet facilities, changing space.

Full Planning Permission North Hertfordshire
30 Sept 2026 Registered 26/02456/LDCP

9 The Finches Hitchin Hertfordshire SG4 9PB

Insertion of ground floor front window following removal of garage door to facilitate conversion of existing garage to habitable space

Lawful Development Certificate Proposed North Hertfordshire
Recency
Last 2 weeks
2-4 weeks
1-2 months
Older

Get free email alerts for new extensions applications in North Hertfordshire

Set up alerts

Frequently asked questions

When do you need planning permission for a house extension?
Single-storey rear extensions up to 4m (detached) or 3m (semi-detached / terraced) are usually permitted development. Two-storey extensions, anything in a conservation area, or larger projects almost always need a planning application.
What's the difference between planning permission and permitted development?
Permitted development rights let you build certain things without applying for planning permission, subject to specified limits. Anything outside those limits, whether taller, larger or in a protected area, needs full planning permission.
How long does a householder application take?
The statutory target is 8 weeks from validation. Most simple householder extensions are decided within that window; complex or contested cases, especially those drawing a lot of comments, can take longer.
Can I get email alerts for new extensions applications in North Hertfordshire?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by North Hertfordshire. You can also narrow the alert to a postcode, street, or drawn area.

We check North Hertfordshire's planning portal daily. New extensions applications appear here within a day of being published.