Welcome to AAC DESIGN (House Extension Design)

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Costs

We pride ourselves on offering excellent value for the services provided, we only prepare plans for House Extensions / Conversions, so that is what you pay for. 

We try to be as fair as possible. Our quotations are worked out individually. & not some fancy promotional package. Various factors that may affect the price could be. If the existing house is larger than average (the whole house has to drawn regardless). If there are existing buildings to be demolished. If the proposal is overly complicated or requires special 'non standard' features (possibly due to neighbouring properties or nearby trees.

Our minimum fee for preparing plans is £600. As a rough guideline, single storey extensions are usually between £600-£1000. Two Storey extensions are usually between £1000-£2000 & loft conversions between £1500-£2000. larger or more complicated extensions than average will attract higher fee,

When a design cannot be agreed at the time of survey, or if a client is uncertain what they want, we are happy to provide proposal sketches (usually by email) until a satisfactory design is reached. In these cases our fee is charged at an hourly rate of £50/hour.

Should the design need to be changed after the design had been agreed, then  our fee is charged at an hourly rate of £50/hour.

Additional copies of the plans can be provided at any time at a cost of £5 per sheet)

* prices accurate as of Jan 2022 & are based on survey carried out at time of initial visit

Exclusions: The following Items are not covered by our Fee & are the responsibility of the customer (if Required)

Council Fee's: Cheques are payable directly to the Council

Planning: An Online Application Fee of £234 is payable when plans are submitted for approval.

Building Control: An Application fee of £200  is payable when plans are submitted for approval. There will be an inspection fee of between £200 - £900 payable when building work commences, additional fee's may be incurred if the proposal includes separate internal changes.

Structural Engineering calculations: (not usually required on basic Extensions) for Steel beams, calculations for piers, roof loadings, special foundations etc. etc. 

We have a very good Engineer who we use (unless you would rather use your own) costs can be From £120 to £600+ depending on the complexity.

Site Location Plan: Sometimes a Land Registry extract is acceptable but in most cases I have to create online and save a site plan from a licenced outlet, I charge £30 for these.

Third Party Inspections / Surveys: Not usually required but basically anything that is not covered in 'Our Service'  

Party Wall Agreement: If the proposal affects a joining wall, or even if the proposed foundations are within 3 metres of your neighbours foundations & are deeper than theirs, (the majority of extensions) this should in fact mean that you enter into a party wall agreement with your neighbour. This can normally be amicably sorted with a correctly worded document, which you get your neighbour to sign. However should your neighbour not want to sign? Then unfortunately party wall surveyors will have to be appointed to mediate. The cost for both parties is all payable by you. This can also take a very long time. If required we can provide a party agreement document for you & your neighbour to sign.

The Government has published guidance on this which can be found Here

Certain unscrupulous party wall surveyors contact owners & neighbours of proposed extensions making it sound as though they work with the local authority, this is definitely NOT the case & if contacted I suggest their paperwork is put in the bin with any other junk mail.

Drain 'build over' Agreement: If The proposed extension is over (or even within 3 metres) of a public sewer. then a build over agreement from your water authority will be required, this is not always apparent when the site survey is carried out, the cost varies depending on the authority.

It can sometimes be Free with a self-certified agreement. But more often costs around £350 or considerably more if the drain is larger than 160mm

 These days any drain that is shared, is now a public drain, Independent guidance can be found Here    

Because of the additional work and administration we have to charge an additional £80 to handle this application.