Christmas closure

We will be closed for Christmas from Wednesday, 24th December 2025 and reopening on Monday, 5th January 2025. Please feel free to enquire during this period and we will respond to you upon our return.

Important notice:
Due to high demand, we are currently fully booked and unable to take on any new work before 27th July 2026.

Extension Plans London

Extension Plans London

Extension Plans London: We are your one-stop shop for architectural solutions for home extensions and conversions throughout London. Our services include extension Planning Applications, Building Regulations, Structural Calculations, and Party Wall Surveying services
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"A smooth, efficient service and excellent value for money. Highly recommended."

royal institution of chartered surveyors RICS surveyors
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Extension Plans for your project in London

Extension Plans London: We provide a range of architectural services for homeowners in London looking to carry our home extensions and loft conversions, including Planning Applications, Building Regulations, structural calculations and party wall surveying.

Fixed Fee

We offer a fixed price on all our planning & building regulation drawings, so you now what you’ll pay.

Affordable

We believe that simple home extension drawings shouldn’t break the bank and, therefore, offer highly competitive pricing.

Quick Turnaround

We turn our drawing around within 10 working days from the date we receive the property measurements.

Quality

We never compromise on quality. Our drawings are fully compliant and just like you’d get from an architect, only cheaper.

Single Storey Extensions

Two Storey Extensions

Two Storey Extensions

Garage Conversions

Basement Extensions

Garden Offices

extension plans london

Extension Architectural Services

We offer a range of professional architectural services for homeowners looking to undertake extensions to their properties, including:

Planning Applications

We prepare fully compliant Planning Application drawings which are ready to submit to your local authority. We also manage the application for you.

Building Regulations

We prepare drawings and notes for Building Regulations applications which are ready to be sent to your building control officer for both Full Plans & Building Notices.

Structural Calculations

We work with highly experienced structural engineers who can provide accurate structural calculations and drawings for your project.

Party Wall Surveying

We have experienced RICS Chartered Party Wall Surveyors who can provide impartial advice on the Party Wall Act and its implications for your project.

About Murrins

Since 2015, Murrins has provided hundreds of homeowners with professional architectural planning and building regulations drawings for their home extensions and conversions.

Our small team consists of RICS Chartered Surveyors and experienced architectural designers with years of experience in residential architectural design. Based in the South East, we work with clients across the country, particularly around Kent, Surrey, Sussex, Essex, and Greater London.

Sample Projects

Articles & Posts

Articles and posts from our surveying blog.

18 September 2026

| By: Alex Murrin

Buying a home with mature trees? Learn how trees can affect buildings, drains and future extensions, and when a RICS Home Survey or arboricultural report is needed.

Modern extension on Victorian house.

26 January 2026

| By: Alex Murrin

With so much of the UK's housing stock consisting of Victorian properties, we take a look at how these 100+ year old homes have evolved to meet modern living demands and regulations.

8 January 2026

| By: Alex Murrin

Damp Proof Courses (DPCs) protect homes from rising damp; however, many problems come from bridging, raised ground levels, or misdiagnosis. This buyer-friendly guide explains what DPCs are, how they should be installed, a brief history, retrofit options and their pitfalls, and practical steps if your DPC sits too low or is bridged.

a row of brightly decorated terrace houses with a blue sky

5 January 2026

| By: Alex Murrin

10 of the most common defects found in RICS surveys, why they matter, and how to respond so you can buy with confidence and budget wisely.

Crack in a wall during party wall schedule of condition.

17 December 2025

| By: Laurence Murrin

Cracks in UK homes are common, and a significant cause for concern for property owners. In this article I will look at the main causes of cracking, how to identify problem cracks, and what repairs may be required.

a corroding steel taking during a homebuyer survey greenwich

8 December 2025

| By: Murrins

Damp and mould are among the most common issues affecting London homes. Traditional construction methods, ageing housing stock, and poor property management, combined with the city’s regularly wet climate, make these problems both widespread and recurring.