Barnet architects | Residential architect projects

At GOAStudio London residential architecture we have extensive experience with working with the Barnet planning department and we are familiar with all the relevant planning policies that might apply for your home project. Please see below links to some of our Barnet residential architect projects.

Your personal requirements, the setting of the property, and the immediate context of the property are some of the factors that will determine what home alterations the Camden planners will be prepared to allow. We will advise you about what is reasonable to expect to get approval for, what might be tricky but still possible to get approval for, and what most likely the planners will say no to.

According to the Barnet Council residential design guidance these are some of the key considerations that will determine the outcome of your planning application. Below we have copied and highlighted extracts of the most relevant current policy and advice for your home project.



Summary planning and design guide | Barnet residential architect advice


Barnet is an attractive borough which is largely suburban in character and contains a variety of density levels, buildings and townscape typologies which reflect its historical development. Its suburban character is mainly made up from a mix of detached, semidetached and terraced housing and contains many good examples of historic residential developments for example in Hampstead Garden Suburb, Totteridge, Cricklewood Railway Terraces and Monken Hadley.

Design has a strong role to play in the planning system, both in terms of plan making and decision taking. Good design is not simply a matter of preference or taste. It creates successful places capable of providing people with a good quality of life. Good design is fundamental to delivering many of Barnet’s planning objectives including managing housing growth to meet housing aspirations as well as the protection and enhancement of the suburbs. Therefore, this Supplementary Planning Document (SPD) provides greater details on the design aspects of residential developments as set out in Barnet’s Local Plan and the London Plan.


Extensions to houses both individually and cumulatively can have a profound effect on the appearance of an area and on the amenities enjoyed by the occupiers of adjoining properties. In general, extensions should reflect the design of the original building, whilst having regard to the character of the area and the residential amenity enjoyed by neighbours. This means ensuring that the extension does not significantly impact on people’s enjoyment of their own home or garden.

Not all houses can be extended. This may be due to lack of space or their position or design will mean any extension would harm the street scene or local amenity. In addition, there is a limit to how much most houses can be extended. The cumulative effect of extensions and their impact on the appearance of an area should also be taken into account. This means that proposed additions, which meet all the guidelines included in this SPD, may still be considered unacceptable and be refused planning permission.


Extensions to properties should not be overbearing or unduly obtrusive and care should be taken to ensure they do not result in harmful:

  • loss of privacy by overlooking adjoining properties
  • loss of light or overshadowing of adjoining properties, particularly loss of light to main windows serving principal rooms such as living or dining rooms
  • loss of outlook from adjoining properties
  • sense of enclosure or overbearing impact on adjoining properties
  • loss of garden, landscaping or open space, which contributes to local amenity
  • loss of parking space that is desirable to retain

An extension at the rear of a property may affect the applicant / householder’s amenities by restricting natural light to existing rooms requiring, artificial light to be used for much of the day which will cost more in energy, be less sustainable and affect the enjoyment of the accommodation.


Proposed extensions should be consistent with the form, scale and architectural style of the original building, particularly where it is a period or suburban property. Consistency with the original type of a building can be achieved by:

  • Respecting the proportions of the existing house
  • Using an appropriate roof form
  • Matching materials and details
  • Use of innovative design that can add and improve the building outlook
  • Matching the window style, proportions and position
  • Reflecting the character of the original house.

Whichever type of design is proposed, the following rules should apply:

  • The extension should normally be subordinate to the original house
  • The extension should respect the original building and should not be overly dominant
  • The height of the extension should normally be lower than the height of the original building. For example, this can usually be achieved for a two-storey side extension by stepping down the roofline and setting back the front building line.


Side extensions to existing buildings can be unacceptably prominent features in the street […] Where gaps between houses are a common feature of a street, then proposals which close such gaps or create a terracing effect by bringing buildings too close together are likely to be rejected.

Side extensions should not be more than half the width of the original house. In addition, the setting back of the front wall of side extensions from the front building line can help to reduce the visual impact on the street scene. First floor side extensions should normally be set back 1 metre from the front main wall of the existing house.

Pitched roofs help extensions fit in with the street and may be required for single storey extensions. Pitched roofs, following the same pitch as the existing roof, will normally be needed for two storey extensions and be set down at least 0.5 metre from the ridge of the main roof. Side windows or other detailing can help improve the appearance of a flank wall.

In order to reduce the visual impact of two storey or first floor side extensions, there should normally be a minimum gap of 2 metres between the flank walls of properties at first floor level (i.e. a minimum gap of 1m between the boundary and the extension at first floor level for most two storey extensions).


The depth of a single storey rear extension, normally considered acceptable for terraced properties is 3 metres, for semi-detached properties it is 3.5 metres, and detached property is 4 metres.

Single storey rear extensions to the original house, need to ensure that:

  • the depth and/or height of the extension does not cause a significant sense of enclosure, or loss of outlook from, or light to, principal windows of habitable rooms of neighbouring properties
  • they do not look too bulky and prominent compared to the size of the main building and garden to which they relate
  • if the garden space is in breach of amenity standards then application will normally be refused
  • in addition, if the adjoining house is at a lower level or has a rear building line set back from your rear building line, the depth of the proposed extension may need to be reduced in order to protect amenity of your neighbour.

However, where there is significant harm to neighbours or residential amenities, deeper extensions than that of neighbour’s house would be inappropriate. In such cases each proposal will be considered on its own individual merits. Two storey rear extensions which are closer than 2 metres to a neighbouring boundary and project more than 3 metres in depth are not normally considered acceptable. This is because they can be too bulky and dominant, and have a detrimental effect on the amenities of neighbours.

Flat roofs should not normally be used as balconies as loss of privacy to immediate neighbours almost always results. This applies to side as well as rear extensions. Flat roofs on two storey rear extensions are not normally acceptable because they do not relate sympathetically to the house.

Proposed extensions on properties located within a designated conservation area will need to ensure that they preserve or enhance the character and appearance of the conservation area.


Large, front extensions will not normally be permitted because of their effect on the street scene and character of the area in general.

Where it is considered that a building may reasonably be extended forward (for example, on occasion detached houses in low density areas or in roads with irregular building lines), the following principles should be observed:

  • the new roof should normally reflect the roof form of the existing house (e.g. pitched with tiles to match)
  • front extensions should fit in with the architectural style of the house
  • care should be taken to ensure that front extensions have regard to, and do not conflict with, existing architectural features such as bay windows
  • windows should be positioned where they do not have a harmful effect on the amenities of neighbouring properties


Additional, usable space can sometimes be created by converting roof space, providing this is carried out sympathetically. This often involves the formation of dormer windows or the insertion of roof lights. Many houses in Barnet have roofs that are too small for conversion, or in some cases, dormer windows or roof lights may be out of keeping with the character of the area.

A dormer roof extension is a vertical window or opening in a sloping roof, having its own roof, either flat, pitched or curved. Such extensions can have a significant effect on the appearance of a house and their design needs careful consideration.

Dormers on the front of semi-detached or terraced houses will not generally be acceptable, due to their unbalancing effect on adjoining houses and the general street scene. Any exceptions are extremely limited and usually only where original front dormer extensions exist.

The following points should be considered for dormer roof extensions:

  • Design – should reflect style and proportion of windows on the existing house. Dormers may have flat, gabled, hipped or curved roofs and subject to the criteria on position, should normally align with the windows below.
  • Position – Dormer roof extensions should not overlap or wrap around the hips or rise above the ridge. Adequate roof slope above and below the dormer is required on semi-detached and terraced properties, the dormer extension should be set in at least 1 metre from the party wall, flank wall or chimney stack. In smaller terraced houses where due to internal physical constraints dormers that are set in less than 1 metre will be taken into account providing such constraints and any minimum Building Regulation or fire regulation requirements are clearly and robustly demonstrated.
  • Scale – Dormer roof extensions should normally be subordinate features on the roof and should not occupy more than half the width or half the depth of the roof slope. Dormers which wrap around the hips will not normally be considered acceptable
  • Proportion – To retain the balance of the house, the dormer roof extension should not normally be wider than the window below it and the dormer cheeks kept as narrow as possible. For smaller enclosed houses, such as terraces consideration and allowance will be given to internal workable space and Building Regulation requirements for wider roof extensions. On side dormer extensions, where there is a requirement to provide adequate headroom for stairs, the extension should still be set away from the ridge and clear of the hips.
  • Overlooking – Care should be taken in the design and location of new dormers, including side dormers to minimize overlooking.
  • Materials – The window materials and design should be in keeping with those on the rest of the house. The dormer cheeks should be finished with lead, tiles, slates or other traditional materials, and the top of flat roofed dormers should be finished with lead or zinc. The use of roofing felt for the roof, cheeks or face of the dormer should be avoided.

GOAStudio London residential architecture and interior design is an award-winning practice, specialising in architectural services for residential projects across London.

As your local residential architect our team aims to provide a friendly and professional service for your home project.

Our approach is based on carefully considering the particular aspects of each scheme before coming up with a creative way for you to instil your unique stamp on what we do and how we do it. 

Royal Institute of British Architects (RIBA) and Architects Registration Board (ARB).

Appoint us for Barnet residential architect projects in the following areas:

East Finchley, Hampstead Garden Suburb
Church End, Finchley
Muswell Hill
Brunswick Park, Friern Barnet
North Finchley, Woodside Park
Totteridge, Whetstone
Brent Cross, Hendon
Mill Hill
Colindale, The Hyde
Golders Green, Hampstead Garden Suburb

 Barnet residential architect projects

For more information about the Barnet planning department, policies and requirements please click the link above to be re-directed to the Barnet Council website.

Name and origin

The borough of Barnet contains plenty of Barnets — High Barnet, Chipping Barnet, Friern Barnet, New Barnet… All derive their names from the Anglo-Saxon word ‘bærnet’, which suggests the clearing of woodland by burning. It was first recorded as Barneto in 1070. []

Barnet planning department

You will probably need planning permission if you want to build something new, make a major change to your home – e.g. building an extension, or change the use of your property. There are different rules depending on what you want to do and the relevant planning policy that applies to your property. At GOAStudio, your Barnet residential architect, we have a proud record of dealing with the local authority planners and building control inspectors and we are on hand to assist with your application and successfully handle every stage of your project.

GOAStudio London residential architecture media opinion publications 2 Barnet residential architect projects

iBuild magazine – Impressive renovation case study – South Hampstead residential house extension – February 2024

"GOAStudio's renovation and extension project in South Hampstead stands as a testament to the delicate art of preserving history while embracing the demands of contemporary living." This month our South Hampstead residential house extension and refurbishment project...

The Telegraph | How to get a bigger home in an unforgiving market

"As the inflation rate has started to fall and mortgage rates have drifted down, George Omalianakis, of GOAStudio London architects, says the appetite for renovations has started to creep up. “Homeowners are deciding that the future looks a bit better now and it is...

Ideal Home | Kitchen extension cost – what to budget for a new and large room

You want to land on an extension size that is just large enough to meet your internal needs. Going beyond this would be a waste of money. 'You will discover the right size by playing around with a few plans and layouts to see how best you can organise the internal...

Country Living – 9no. kitchen flooring ideas for a refreshed look. Tips and ideas by George Omalianakis, GOAStudio

9 kitchen flooring ideas for a refreshed look - Plus advice on practical choices for busy spaces, upcycling your existing tiles and how to pick underfloor heating. Article by Jayne Dowle, Country Living "The biggest trend of all in kitchen flooring in 2023 will be...

Homebuilding & Renovating | How much value does a loft conversion add

How much value does a loft conversion add? "The typical value added can be around 10% to 20% if creating a new bedroom and ensuite with a loft conversion, explains architect George Omalianakis from GOAStudio architects. He adds that the value increase will depend on...

Build It magazine | Lighting for kitchen diner extensions

"In general, there are two main impressions you can create with natural light. The theatre stage effect plays with the contrast between the lighter and darker areas, meaning less is more when it comes to rooflights. By reducing the amount of overhead light coming in,...

Architectural plans

Architectural plans and professional guidance for your home project You will need to prepare architectural plans for your home project. They are often called “architect plans” however they do not need to be prepared by chartered architects (ARB / RIBA) as such. While...

Terraced house extension plans

Terraced house extension plans and professional guidance for your home project   Do you own a Georgian, Edwardian or Victorian house? Is it terraced, semi-detached or detached? And would you like to add a single or double storey extension? In all these cases you...

Architects London – GOAStudio London residential architecture

Architects London GOAStudio London residential architecture We are London architects with a very specific focus, skillset and expertise and we work on residential projects across London. George Omalianakis is an expert London architect for residential extensions and...

Loft conversion cost planning permission architect guide

LOFT CONVERSION COST, ADDED VALUE, AND PLANNING PERMISSIONS By GOAStudio London residential architecture What loft conversion rooms add value?How much does a loft conversion cost?Do loft conversions add value? What is a hip-to-gable loft conversion?What is a mansard...

Rear house extension ideas photo gallery

REAR HOUSE EXTENSION IDEAS PHOTO GALLERYBy GOAStudio London residential architecture Clad in brick or clad in timber.Fully glazed or half glazed. Timber frames or steel frames. Round skylights or walk-on skylights. Regular roofs or irregular roofs.Choose a shape, any...

Find interior residential RIBA architects for extensions near me

A HOW-TO GUIDE SEARCHING ARCHITECTS ONLINE FOR YOUR HOME PROJECT "find architects near me" "find an RIBA architect near me" "architect firms near me" "residential architects near me" "architects for extensions near me" "interior architects near me" We are often asked...

Householder planning permission. Haringey Noel Park Conservation Area.

Addition of a single storey rear extension and internal alterations to a single family dwelling in N22, Haringey.Area and context The site is a two-storey terrace dwellinghouse on the south side of Maurice Avenue. The property is located within the Noel Park...

Bromley BR3 house extension planning approval

Single storey rear extension and alterations to a house at Bromley BR3 - Approval by GOAStudio London residential architecture We have just obtained a planning approval for one of our current projects in Bromley BR3. For our latest Bromley BR3 house extension planning...

New planning approval Rear garden flat extension Westminster NW6

Planning approval for the addition of a single storey rear extension to a garden flat in Westminster, NW6. To include the replacement of windows to the front elevation. The new planning approval for a rear garden flat extension Westminster NW6 was issued by the...

New planning approval Conservation Area Waltham Forest E17

Planning approval Conservation Area Waltham Forest E17. To include the replacement of three timber windows to front and one timber window to rear with heritage uPVC double glazed windows - Orford Road Conservation Area, Waltham Forest in September 2022. The new...

New planning approval Rear house extension Enfield N21

Rear house extension Enfield N21 - We were appointed to design the renovations and extensions for a single family dwelling in a conservation area at Enfield N21. We have just obtained planning approval for a single storey rear ground floor extension to create a...

New planning approval rear house extension Barnet EN4

Rear house extension Barnet EN4 - We were appointed to design the renovations and the addition of a rear extension for a single family dwelling at Barnet EN4. We have just obtained planning approval for a single storey rear ground floor extension to create a combined...

New planning approval | House extensions Ealing W3

House extensions Ealing W3 - We were appointed to design the renovations and extensions for a single family dwelling at Ealing W3. We have just obtained planning approval for a single storey rear ground floor extension to create a combined kitchen, dining and living...

New planning approval | Double rear extension Tower Hamlets E1

Double rear extension Tower Hamlets E1 - We proposed and obtained approval for the addition of a double storey rear extension to a ground floor maisonette flat; the planning approval included the creation of an external terraced area and associated internal and...

New planning approval | Rear house extension Enfield EN2

Rear house extension Enfield EN2 - We proposed the addition of a 4m. deep rear extension to create an enlarged kitchen and dining area that opens up to the rear garden. We made sure that the proposal could be considered as Permitted Development and we applied to...

New planning approval | Single storey front side house extension Barnet N2

New planning approval | Single storey front side house extension Barnet N2; to include internal alterations to create a new bedroom.

Let's chat

If you need expert advice from an RIBA Chartered Architect please email us at with the following:

  • the full address of your property,
  • a couple of photographs showing the areas you would like to extend and renovate,
  • a brief description of the changes you would like to carry out to your home, and
  • any estate agent or similar plans you might have available.

We will

  • assess the information and get back to you with initial advice about what might be feasible,
  • search the public planning records of your local authority to find similar planning approvals nearby,
  • prepare a free consultation to include information on design ideas, architectural fee estimates, project stages and requirements, and
  • afterwards we will prepare a detailed fixed fee proposal to cover the architectural services you will need for your project.

We are here to assist with your project.

We provide architectural services in the following London Boroughs:

Read our design, planning, and architectural guides above if you seek advice for your project.

We can help you with these home extensions and renovations:

See our guides above for ideas, inspiration and architectural advice for your home project.

GOAStudio London residential architecture limited 2024 300x300 Barnet residential architect projects

We specialise in

  • Greener homes
  • Retrofit and energy efficiency for older and traditional buildings
  • Conservation areas
  • Listed Buildings
  • Homeowner architectural services
  • Developer architectural services

RIBA Chartered architect services


GOAStudio London residential architecture limited, 86-90 Paul Street, EC2A 4NE, Hackney

GOAStudio London residential architecture limited, Chestnut Avenue South, E17 9EJ, Waltham Forest

t: 0203 984 3005


RIBA White 300x68 Barnet residential architect projects

arb logo wl Barnet residential architect projects