Frequently Asked Questions


AEM Building and Construction, estimate that on average, and experience, some extensions can take between twelve (12) and sixteen (16) weeks to build. That said, this deliverable target, depends on the size, and specification of the programme.
Our lead in times are currently two (2) to four (4) weeks assuming that you already have plans, structural calculations and party wall notices in place (if required).

Please contact us below for a more accurate start dates.
A Party Wall Agreement is required if your home has a wall that is connected to another property on either side. Each neighbour will have to be informed of the proposed works using a Party Wall Notice form, and this must take place, at least two calendar months before the intended start of the build.

Do note: The Party Wall Agreement, is there to protect you and your neighbour from issues that might arise due to work done on the party wall. It draws up an agreement between you and your neighbour on what needs to happen if there is a problem.

By law your neighbour can insist you have one before the work starts. This process is handled by clients directly, however if required, AEM Building and Construction can advise you on this process and put you in touch with a certified Party Wall Surveyor.
On average it takes us between four (4) to six (6) weeks from signing the contract.
In general it can take up to eight (8) weeks for a set of plans to be approved. That said, not all extension projects require planning permission – contact us below for more details.
If your property is not in a conservation area you may have permitted development rights (PD). This means you can build your extension without having to go through the planning permission process. For more details on the requirements and criteria for this, please visit the UK planning portal.
With planning permission you are asking the council if your proposed scheme is acceptable. It is open to rejection by them and/or your neighbours and will have to follow the local development plan.

With permitted development you are asking the council to simply confirm that your scheme fits within the permitted development criteria. The council will issue you a Lawful Development Letter if they agree.

Technically you are not required to have the Lawful Development letter in place before the work starts and in fact there is no law stating you have to have it. This allows clients who request it, to start the work without waiting for the Lawful Development Letter thus saving time.
There are many different types of extensions that can be added to your property such as rear kitchen extensions, side return extensions and even double storey extensions.
Building work can cause disruption and slightly stressful, after all we are completely altering your home! However there are certain tips and measures that can be taken to ease this process. If budget allows – build temporary kitchens to enable you to still cook and clean, or to build stud partitions to block out the dust from the rest of your home.

N.B: Always remember to pack away any valuables or anything that could potentially be damaged as materials and equipment will be making their way through your home.
This can vary depending on the size and specs of the extension required. For more ideas and survey contact us below.
We have public liability, employee’s liability and the most important, contract all risk insurance. Documentation can be provided on request.
We cover all areas of London and the South East, Croydon and Kent.
No longer than seven (7) days. This is usually generated within three (3) working days after an AEM Building and Construction surveyor, interior designer and, building contractor has visited the property or site and carried out a site survey.

If you have not received your quotation in this time, please contact us below.
Unfortunately from time to time our rates have to be reviewed due to increasing prices of materials. Our quotations are therefore valid for 3 months.
Yes. We have a specialist loft conversion arm to our business. We have many clients that use us to carry out a loft conversion and an extension at the same time, thus saving hassle and cost by avoiding having two separate contractors.
Yes. Quite often, we carry out refurbishment work to bedrooms, living rooms, bathrooms and downstairs toilets and utility rooms.

Please enquire for prices on your site survey.