Project schedule #7 Rear Extension in Hampton

Project schedule

Year: 2018-2019

Location: Hampton, London Borough of Richmond upon Thames

RIBA Design Stages: 0-5

Architect:

Square One Architects

Structural Engineer:

Steve Nicolaou

Building Control:

Building Control Approval

In this schedule we will revisit a project designed in 2018 for a rear extension in Hampton.

This was a very fun project for a young couple and their lovely dog. The existing house was a typical terraced property that had been extended at loft level.

The ground floor of the house also featured a rear extension probably from the 1980’s. The extension had been poorly built at designed and needed renovation. This is a very typical scenario, house extensions built in the 80’s are often mediocre construction with hardly any insulation and poorly performing windows.

In this case the rear extension was also not making the most out of the full width of the site leaving a side-patio that was essentially wasted space.

Internally an opening had been created between the reception room and the rear. More and more clients are asking us to revert these types of feature. The front reception room was usually designed to create a buffer between the street and the more private rear of the house and people are starting to appreciate this feature more and more.

Our project targeted all the problems highlighted above with a new rear extension that included a bright kitchen and dining area and a new WC and utility room in the darker section of the ground floor.

We analysed daylight carefully in order to provide as much natural daylight to the extension as possible. The before and after pictures speak for themselves.

The clients’ feedback was great, they felt the ground floor had been resolved with a rear hallway leading to the ground floor WC (separated from the rest of the living and dining areas). The rear extension features large skylights and Crittall style French doors and window (supplied by Fabco Sanctuary). They also appreciated having a very private front room.

The result is a very practical layout with an open and bright living area that the clients will certainly enjoy in the years to come.

Before and after images

Open plan

Kitchen

External view

Side return

Project schedule #6 Rear Extension in Hampton Hill

Project schedule

Year: 2016-2017

Location: Hampton Hill, London Borough of Richmond upon Thames

RIBA Design Stages: 0-5

Architect:

Square One Architects

Structural Engineer:

Wallace Wheating

Building Control:

Building Control Approval

This project for a rear extension in Hampton Hill dates to 2016.

The clients, a retired couple, asked us to extend their property to the back. The existing house was a typical 1930’s semi-detached dwelling with a large garden to the rear. The clients’ initial brief was for a straightforward three meters rear extension with some internal alterations that would allow them to have an open plan layout, however they had an additional request: to retain a sunny corner in their outdoor patio. This led to the decision to design a three meters rear extension built under Permitted Development that would not use the full width of the rear garden in order to retain the sunny corner that our clients loved so much.

In order to highlight this design intention, we proposed to have an L-shaped window that would provide views to the rear garden and to the side patio at the same time. A set of large French Doors was then designed to allow access to the site patio. The client was also very keen to use triple glazed Swedish windows and chose West Coast Windows as their supplier.

It was agreed with the client to have a flat roof extension reminiscent of the 1930’s minimalist approach that would create a nice contrast with the existing style of the house. In order to highlight this minimalist approach, we concealed all the rainwater pipes within the new walls.

The same logic informed the materials inside the extension where a herringbone wood floor was chosen for both the existing and the new section.

As we always do, we simulated the amount of daylight that the extension would receive depending on the moment of the year to guarantee that the new new space would be very bright at any moment of the year without any overheating.

The result is an extension that enhances the existing building and is very cohesive in terms of interior design with the rest of the property. In this circumstance we worked with an interior designer who happened to be our clients’ daughter in terms of internal materials and color palette. It was a very successful project that pleased all the parties involved.

Before and after images

Rear elevation

Dining and sitting area

Project schedule #5 House Extension in Byfleet and New Haw

Project schedule

Year: 2018-2019

Location: Byfleet and New Haw, Runnymede Borough Council

RIBA Design Stages: 0-5

Architect:

Square One Architects

Structural Engineer:

Glencross & Hudson

Building Control:

Assent Building Control

This project was for an extension to a large detached house in Byfleet and New Haw for a family of three with a small child.

When the client got in touch with us in first instance, we visited the site and found that the house needed a renovation. The client was also not satisfied with the ground floor arrangement that was very partitioned and formed rooms that where both small and dark.

At first floor level the layout was more acceptable, however the house lacked the presence of a real master bedroom with a dressing area and an en-suite bathroom, which is something that you would expect from a property of this size.

Our brief was to extend a house with a rear extension and form a new open plan layout including a kitchen, dining area and sitting area. The client also requested a first-floor side extension on top of an existing garage that would provide space for an en-suite bathroom and dressing area linked to an existing bedroom.

We considered two options for the existing garage. The first one was to retain it and build on top of it and the the second one was to demolish and rebuild. As it often happens in these cases the option to replace the existing garage ended up being more cost-effective. It is not unusual to find period structure that are not able to carry any extra load from a structural point of view, especially at foundation level. In these instances, we always suggest our clients to hire a builder for a couple of hours, perform several trial pits and then submit the results to a structural engineer that will decide whether the existing structure is suitable or not. All the details will then need to be confirmed with Building Control.

The ground floor rear extension also features a set of large bi-fold doors that opens towards the rear garden and a window in correspondence of the kitchen sink. A set of two large flat roof lantern skylights also help bringing daylight in the new open plan area.

The first-floor side extension also features rear and front windows and a large skylight that guarantees uniform levels of daylight throughout the whole floor plan.

The clients’ feedback was very positive, and we appreciated hearing that they used their new spaces in a more practical way with their toddler always in sight. That's a big advantage of open plan layouts!

Before and after images

Rear elevation

Kitchen and dining area

Front elevation

Project schedule #4 House Extension in Barnes

Project schedule

Year: 2017-2019

Location: Barnes, London Borough of Richmond upon Thames

RIBA Design Stages: 0-5

Architect:

Square One Architects

Structural Engineer:

Glencross & Hudson

Building Control:

Building Control Approval

We started this project in 2017 for the client, a family of two.

The brief included a ground floor rear extension and a loft conversion to an existing terraced house in Barnes, South West London. The property fell within the Barnes Green Conservation Area.

As it often happens in these cases the challenges were not just architectural and structural. Planning in these instances can represent a potential roadblock, especially with the property falling in a Conservation Area.

The proposals were discussed with the client and then agreed with the planning officers. In this case we worked very hard with the Council proving the presence of similar precedents on the road and discussing the best design for the roof in order to be in keeping with the style of the Conservation Area. The initial proposals for a larger rear dormer was amended to allow for two smaller conservation style lead dormers that were welcome by the Council.

The property was also extended to the rear in order to form a new open plan layout with a galley kitchen opening on a patio that constitutes the only outside area of the house. In order to maximize the feel of space between the inside and the outside it was decided to have a flush threshold between the floors and use the same tiles for both the kitchen area and the patio. A set of large sliding doors also helped to create the feeling of a seamless transition between indoor and outdoor space. This project is an example of how good design can help maximize the spatial feeling even when square footage is limited.

An additional technical complication was the presence of a manhole within the existing property which had been double sealed. In order to carry out our extension and alterations we had to move the manhole to the new patio and reach an agreement with Thames Water.

We also pushed both the contractor and structural engineer to conceal the new structure within the existing ceiling to form a smooth transition between the various spaces at ground floor level.

In the end we were very pleased with the result and consider this project to be extremely successful.

Before and after images

Ground floor kitchen and dining

Ground floor patio and kitchen area

Second floor guest bedroom

Project schedule #3 Rear extension in Teddington

This project for a rear extension in Teddington dates to 2017. The clients, a family of four with two small children, approached us asking for a complete remodeling of the ground floor of their house that would include a side extension and a large rear extension. The idea was to integrate within the existing spaces and in the new extended spaces a guest WC, a utility room, a small home office and a large open space to include a generous kitchen a dining area and a sitting area. The presence of some large rear extensions in the properties nearby served as a precedent in terms of planning. It's always very important to look around your property and see what your neighbors have built in the past. The rule of thumb is that if planners gave approval for an extension recently that precedent should be used to support the new application.

The product is characterized by large glazed surfaces including several flat roof skylights, two sets of French doors and a large window in correspondence on the kitchen area. The client was adamant to avoid having large bi-folding doors to the back, they wanted their extension to feel unique and to integrate traditional elements in its design. It was agreed to use Crittall style steel windows reminiscent of the 1930`s design. It was also agreed to leave some steel beams exposed. In these cases, any structural element needs to be treated with specific intumescent paint in order to avoid any fire hazard. This type of details was agreed with building control before the beginning of construction.

We are extremely pleased with the result and the client provided a wonderful feedback. The simple lines of the new extension are in keeping with the relatively straightforward design of the rear of the existing 1930’s house.

Before and after images

Rear elevation

Project schedule #2 Home extension in East Sheen

Project Schedule

Year: 2017-2018

Location: East Sheen, London Borough of Richmond upon Thames

RIBA Design Stages: 0-5

Architect: Square One Architects

Structural Engineer: Glencross & Hudson

Building Control: Building Control Approval

The client for this project, a family of 5 with 3 small children, came to us in 2017 with a very specific brief. They had obtained planning permission using another architectural firm; however, they were not happy with the overall design.

The original project included a side extension, a rear extension and a first-floor infill extension. Despite getting planning approval for a significant additional square footage, the client was not very happy with the overall design and felt that not enough time and care had been spent in the  initial design phases (concept and schematic design) in order to agree a plan.

In this instance our first goal was to optimize the existing plan. Since the very beginning it became obvious that we would have had to go back to the planners with an amendment to the original planning application. The new plans were thoroughly discussed with the client until the layout was totally agreed.

Revised drawings were then submitted and subsequently agreed with the council. The side extension included a bedroom with a small living space and an en-suite bathroom to be used as a granny annexe for the clients’ aging parents.

The rear extension included an open plan kitchen, dining area and living space for the family.

The first-floor infill extension included a new large family bathroom (the original property was curiously lacking a shared bathroom and featured only two en-suite bathrooms).

The client also asked us to design a loft extension for the property an include a bedroom with an additional en-suite bathroom to be used by their au-pair.

The original four-bedroom house was turned into a generous 6-bedroom property with a well-proportioned family bathroom, three en suite bathrooms and plenty of open plan space to be shared with the client’s growing family. We were thoroughly pleased with the results and received a very positive feedback from the client.

BEFORE AND AFTER IMAGES

Rear elevation

Kitchen and dining area

Kitchen and living area

Ground floor entrance

Guest WC

Project schedule #1 Full house refurbishment in Hampton Hill

Project schedule

Year: 2017-2019

Location: Hampton Hill, London Borough of Richmond upon Thames

RIBA Design Stages: 0-5

Architect:

Square One Architects

Structural Engineer:

Glencross & Hudson

Building Control:

Building Control Approval

The client for this project approached us in 2017 with an initial briefing that included a ground floor side return extension, alterations to the existing stair and several internal alterations to the ground and the first-floor layout.

The existing property was a typical two ups two downs terraced house in Hampton Hill. The property dated back to the late XIX century and in need of renovation. During the initial phases of the design we agreed with the client to turn the original stair by 90 degrees in order to provide a more rational layout. The initial project also included a ground floor side-return extension to form a new living and dining area to the rear and large bi-folding doors.

After obtaining planning approval for these alterations the clients’ plans changed due to their personal circumstances and they decided to add a loft extension to the project.

Sudden changes in the initial brief are not unusual and we as are always happy to accommodate any additional requirement with flexibility.

The brief for the loft extension included two new bedrooms and the family bathroom with one of the bedrooms to be used as a study or guest bedroom.

A new planning approval was obtained for the loft extension and subsequently detailed drawings were produced for both tender and construction purposes.

The refurbishment was carried out within the clients’ budget with no delays, thanks to the professionalism of the contractor, but also to the clarity of our drawings and instructions.

The result is a 4-bedroom house with 2 family bathrooms and well laid out distribution spaces that benefit from additional daylight created by a skylight that was been placed on top of the new stair.

This full house refurbishment has been a great success and we are very happy that the clients, a family of two are now enjoying their extended property.

Before and after images

Ground floor kitchen and dining

First floor bathroom

Rear view

Introducing the project schedules

Our client for a house extension in Twickenham recently stressed the importance of showing before and after images to highlight the impressive difference between the existing building and the extended and refurbished one. Their existing house presented some significant issues with internal steps and changes of ceiling level (a consequence of many subsequent extensions carried out in the past) and our project resolved all this issue providing at the same time an additions room.

For most projects it is important to show where you started, in order to explain in more detail the reasons behind the initial brief from the client and the subsequent decisions.

As a practice we work in a bespoke fashion for all the projects we undertake, and we place attention on the clients’ initial brief.

This gave us the idea of preparing a "project schedule" section within our blog with some key project information.

The schedules are also an opportunity to discuss the projects in a more informal way highlighting the challenges that we encountered while designing our extensions or refurbishments, but also discussing the client’s feedback and our experience working with all the other actors involved in the construction process in particular contractors, structural engineers, party wall surveyors, building control etc...

We will also discuss some planning matters, for projects that were in Conservation Areas that naturally present additional challenges.

In this sense the schedules complement the information that is already available in our projects page.

The first seven schedules are now live on our website, please click on the links below:

Schedule #1: Full house refurbishment in Hampton Hill

Schedule #2: Home extension in East Sheen

Schedule #3: Rear extension in Teddington

Schedule #4: House extension in Barnes

Schedule #5: House extension in Byfleet and New Haw

Schedule #6: Rear extension in Hampton Hill

Schedule #7 Rear extension in Hampton