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We Specialise In All Aspects
Of Extensions Nationwide!

Building Regulations

Building Regulations Drawings are the standards for design, construction and alterations to virtually every building. The standards are developed by the Government and approved by Parliament.

Building regulations are not always compulsory, small extensions can be done under a building notice which only requires Structural Calculations.

In a summary, it is a cross section of your extension or building detailing the regulations that the builder needs to follow, it is also examined by the Building Inspector before and during build.

We strongly advise not to commence your build until approved by Building Control.

You also have a say in how you want it built, there are different types of walls, roofs and floor: all have different pricing in construction. Please speak to a member of our team for more information.

If additional drawings are needed from your/your neighbours party-wall surveyor an hourly charge will be applied.

If you/your builder deviate from the approved plans and Building Control requires the amendment to the drawings a charge will be applied.

It is down to building control Inspector to oversee the project. You/your builder must contact the Inspector to book an Inspection at different stages of the project. E.g. Upon excavation, prior to and upon insertion of a beam etc. You can also call them and speak to them yourself.

If you have any other questions please let us know.

Optional services

Electrical lay out, Mechanical Layout etc please ask a member of our team for more details. The price will vary depending on job size. If you have a drain in the back (sometimes hidden), or if you are building within 3 meters of manhole or sewer systems or any other similar scenario or if the building inspector deems it necessary to be moved, the Client will be compelled to complete Building Regulation Drawings.

Basic Requirements


Structural Calculations

An experienced engineer will complete structural calculations in order to determine how to support your house when taking out load bearing walls. With over 600 engineering jobs completed we are the right people for you! Our Construction service helps us bridge the gap between the architectural designers and builders, giving you a cost-effective and efficient service.

This is compulsory if you are making any openings or taking out any walls or loft conversion and more. Full detailed report on beam, connections etc to be submitted to your local building control.

Please note that if the builder deviates from the approved calculations or uses a different method a small fee is charged for the amendments.

Please do not start any works before building control approval.

If you/your neighbours party wall Surveyor requires changes and additional fee will be charged accordingly (depending on the scale of work).

It is common practice for the engineer to assume loads on some parts of the build until that specific area is exposed. We can do this by sending a tradesman to open and inspect, either pilot holes or steel sizing.

Build Over Agreement

The general rule is that if you will be building within 3 metres from a sewer or drain that the building works will need to be approved by the water company. There is an application fee payable to Thames Water depending on the size of your manhole. We will require full access to the drains and open all manholes.

Tendering Document

By now you must have a substantial amount information to be able to generate quotes from builders.

A badly budgeted job is trying to get it done cheap and hitting a problem that can go on for 8 months to 1 year. When dealing with your home, the cheapest option is not the best option.

In this document you should include any additional works to be done which are separate from the extension. E.g. Removal of a Chimney breast or re-wiring.

If you would like a professional to do it, we can help with that.


A party wall (occasionally party-wall or parting wall, also known as a common wall) is a dividing partition between two adjoining buildings that are shared by the occupants of each residence or business. Typically, the builder lays the wall along a property line dividing two terraced houses, so that one half of the wall’s thickness lies on each side. This type of wall is usually structural. Party walls can also be formed by two abutting walls built at different times. The term can be also used to describe a division between separate units within a multi-unit apartment complex. Very often the wall in this case is non-structural but designed to meet established criteria for sound and/or fire protection, i.e. a firewall.

Who pays the surveyors’ fees?

Under normal circumstances, the building owner would pay the fees (known as costs) as he is the one undertaking the works, usually for his benefit. However, the surveyors will make the final determination.

What happens if I do not agree with what my appointed surveyor is doing?

You are unable to rescind his appointment but you can approach the third surveyor to resolve the matter for you. However, if you have chosen to have just the one surveyor called the ‘agreed surveyor’, then there is no third surveyor to call upon.

This is why you should take care in selecting a surveyor and more particularly as to whether you just need the one ‘agreed surveyor’.

What is the Party Wall Act 3 metre rule?

The Party Wall act covers excavations within 3 metres of an Adjoining Owner if the lowest point of the excavation will be lower than the underside of the footings to the party wall (or parts of their property which are within three metres of the proposed excavation).

There are templates online however a party-wall surveyor can override on a technicality on one or more of many legal requirements.

We can offer a party wall service only if we are appointed by all relevant parties and the Building Owner as the “Agreed Surveyor”.

We Specialise In All Aspects
Of Extensions Nationwide!

Control and subject to their Approval

In some cases, you may require Flood Risk assessment or SAP calculation. We do not offer this service but we work with third-party companies who offer good rates…

Raw DWG files are kept by the company, if you require them, there will be an administration fee.

We do have a fast track service at an additional 30%.

We offer 3D Design at an additional fee. Please speak to a member of our team for more information.