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Castelnau architects.
Britain's No. 1

Barn Elms may be popular, but wait until people see your new home extension, designed by Trustpilot's highest-rated UK architectural practice.

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A planning team staffed by ex-council officers

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Richmond upon Thames planning application stats

Our planning permission win rate for the Richmond upon Thames area is as follows:

Richmond upon Thames

%

UK Average

%

Resi's planning consultant

Catherine Warburton

Former Frome Council Planning Officer
Richmond upon Thames's planning officers

Nikita Gleeson, Nancy Collinge, Jane Woods, Chirag Bhavan, Lillian Durie, ...

140 Number of applications
6 - 366 days Submit to complete time
125 Granted applications
15 Refused applications
8w 4d Average decision time
See if you qualify for Permitted Development

We've had 125 planning applications approved in Richmond upon Thames

First floor Balcony

Castelnau , SW13 9ER

29 Jan '20

Whole house Internal alteration

Merthyr Terrace, SW13 8DL

09 Oct '19

Loft Outrigger dormer

Lillian Road, SW13 9JF

11 Jan '23

Ground floor Rear

Castelnau, SW13 9RP

14 Feb '23

Ground floor Rear

Castelnau, SW13 9RP

01 Apr '22

Basement Main house

Melville Road, SW13 9RH

31 Oct '22

Basement Main house

Melville Road, SW13 9RH

03 Mar '22

Basement Main house

Melville Road, SW13 9RH

15 Oct '21

Ground floor Rear

Bowfell Road, W6 9HE

24 Dec '24

Ground floor Side infill

Rainville Road , W6 9HA

19 Feb '21

Loft Outrigger dormer

Langthorne Street, SW6 6JX

17 Jun '20

Ground floor Rear

Crabtree Lane, SW6 6LN

27 Nov '23

Ground floor Rear

Crabtree Lane, SW6 6LN

09 Jan '24

The above are all actual Resi projects in and around Richmond upon Thames. Projects have been anonymised in accordance with GDPR data regulations.

Average construction costs for the Castelnau area

In the last year, the construction costs we've seen for the Castelnau area are as follows:

Rear

£k

Side Infill

£k

Loft

£k

First Floor

£k

Try our Construction Cost calculator

The Avenue

The Avenue

Ground floor rear
Completed 2020
Planning authority Richmond upon Thames

Why people near Castelnau love Resi

Over 9100 homeowners have trusted Resi with their home extensions — that’s more than any other architect in the UK.

Came across Resi in 2017 and have to say their service has been exceptional on all fronts. Prompt...

Ann

Ground floor Rear

Alexander Ell

Used to do initial design phase for a loft conversion and internal remodelling. Very helpful in t...

Alexander

Loft Main dormer

The best out there

I have been with Resi now for over a year and they have looked after me well. They have helped me...

Dharam

Two storey Side

Luisa Wolf

The planning permission (1st of that kind on my neighbourhood) for the extension of my house was...

Luisa

Loft Main dormer

Peter Spence

So easy! Previous experience with face to face architect not great. But Resi are so easy to deal ...

Peter

Ground floor Rear

Resi are a great investment!

Resi have been great. We knew we needed help and saw a couple of “all in” firms before we found R...

Helena

Ground floor Rear

Patricia Ladly

I had my reservations about getting design plans on-line but the whole process has been very prof...

Patricia

Loft Main dormer

STEVE BOWMAN

Very impressed with the service and the attention to detail to my requirements. the team were ver...

Steve

Ground floor Rear

Freddie White

Great service, easy to use and very fast results, highly recommend. Easy process from start to fi...

Freddie

Whole house New build

Absolutely Brilliant!

I was recommended to use Resi by a friend of mine. I found the whole process an absolute dream. F...

Ayisha

Ground floor Side infill

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Builders we work with in Castelnau

Home Republic Limited
4.7
7 reviews
Covers Castelnau
40 Resi projects
My Extension PM Ltd.
4.8
20 reviews
Covers Castelnau
117 Resi projects
Fittra Construction
Covers Castelnau
4 Resi projects
N-Vico Ltd.
4.0
5 reviews
Covers Castelnau
9 Resi projects
Lifestyle London Design & Build Ltd
5.0
2 reviews
Covers Castelnau
8 Resi projects
D2D Projects Limited
5.0
2 reviews
Covers Castelnau
8 Resi projects
Check out our vetted builders
Other architects in Castelnau

Wodu Architects, F Line Designs, Plansing, MacAusland Design Ltd, iPlans, F Line Designs, Ace Engineering

Postcodes we serve in and around Castelnau

SW14, SW15, SW16, SW17, SW18, SW19, SE1, SE2, SE3, SE4, SE5, SE6

Speak to an expert

We’re always up for 30 min phone consultations to help you with your project.