South East & East England - 0208 183 4321

South West, Wales & Midlands - 01452 346 156

North England & Scotland - 0161 820 3230

Head Office: Porthouse Dean Ltd
St James' Building
61-95 Oxford Street
M1 6EG
Tel: 0161 820 3230


for providing building regs structural calculations for your project at

21 Blackburn Rd Egerton, Bolton BL7 9EP

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Terms and Conditions

1    Quotation

1.1       Contract

The contents of this web page (the quotation) and the terms and conditions, form the contract between us (PorthouseDean Limited) and you (the client). By clicking link at the bottom of the web page which says; “Accept Quotation”, and accepting the terms and conditions, you are confirming that you understand and consent to enter into, and honour, the contract. This does not affect your statutory rights.

1.2       Expiration

The quotation will be valid for a period of 6 months from time of issue only. After this time the quotation will need to be reviewed.

1.3       Scope

Unless noted otherwise in the quotation, the scope of work is restricted to the provision of structural calculations and drawings supplementary to a building regulations application. This means that requests for information by parties other than the building control service provider MAYBE chargeable. In this respect particular attention should be paid to information requested by Party Wall Surveyors in the case of a dispute. We would advise you to investigate party wall requirements at the earliest available opportunity to mitigate the risk of additional costs arising.

If we provide calculations and drawings and these aren’t honoured by the work carried out on site, then any requests for numerical substantiation of those elements fall outside our scope and WILL therefore be charegable.

Any requests for technical clarification on the structural information provided (i.e. technical support request) by a builder or project manager falls within the scope, and therefore WILL NOT be chargeable.

Please be aware that for projects in Scotland we are sometimes asked for construction drawings which, in England and Wales, are typically supplied by an architectural consultant supplying full building regulations drawings. These fall outside of our normal scope and any request to supply these MAYBE chargeable.

1.4       Our promise

Notwithstanding any of the aforementioned limitations on scope, or malign, disruptive, or unreasonable behaviour by third parties, we promise that in the event that a building control authority require clarification on the structural calculations and drawings supplied we’ll continue to work on the project at no additional cost until they are satsified.

1.5       Changes to terms

PorthouseDean reserves the right to amend the terms of the agreement / contract at any point throughout its duration. In such an event (e.g. presumed permission to defer decision-making authority to your architectural consultant) we will notify you of such a change in advance of it coming into effect. This does not affect your statutory rights.

2    Timeframes

2.1       Average Turnarounds

Our average turnaround from the time of instruction over the 2-3 month period prior to the quote date is stated in the quotation. The stated average turnaround is intended to offer an indication of how long it will take for the work to be completed from receipt of instruction. This applies to the Standard and Priority Level services.

2.2       No Guarantee on Turnarounds

We don’t offer guaranteed turnaround times as different jobs take different lengths of time which are hard to predict. Whilst we will endeavour to deliver your project within the average timeframe, we cannot sacrifice quality for the sake of expediency. The jobs are thus processed in the order in which instruction is received, and may take longer than the stated average. This applies to the Standard and Priority Level services, although with the priority service your project jumps ahead of Standard service jobs on the job list and so is more likely to be delivered quicker than if it was a standard turnaround project.

2.3       Issuing of the Document

We do not release any information until we have received payment. If the payment is delayed then the issuing of the document will also be delayed. If payment has been made then the document should be issued on the day that it has been completed.

3    Payment

3.1       Terms

Payment terms are 20 working days from the date of acceptance. PorthouseDean Limited will not issue your information until payment has been received, therefore it is better to make your payment earlier so that as soon as the information has been finalised it can be issued. We will not be liable for any delays which occur as a result of not having received payment.

3.2       Outstanding Payments

PorthouseDean reserves the right to withhold services to individuals or organisations with outstanding payments until such a time as the outstanding payments have been settled.

3.3       Invoicing

You should receive a PDF invoice to your e-mail address within 1 day of submitting your quote acceptance.

3.4       Card Payments

You can pay your bill online by entering your card details, either immediately after submitting your instruction, or at another time convenient to you.

3.5       Bank Transfers

We can accept BACS payments. Our bank account number and sort code are detailed within your invoice.

3.6       Cheques / Postal Orders

We do not accept cheques or Postal Orders.

4    Documentation

4.1       Design Standards

Unless specifically agreed otherwise as part of contractual negotiations, documents will be produced in compliance with the British Standards (5950, 8110, 5628, 5268, 8666, 8002, 8004, 6399 etc.). These were officially superseded by the EU Eurocodes in 2010 but are still widely accepted by building control service providers. Calculations can be provided to suit Eurocode, but this is to be agreed in advance of the project being undertaken.

4.2       Format

All documents are issued in PDF format via e-mail for efficiency. If you require paper copies these can be obtained in conjunction with a printing firm. We cannot provide this service as we do not have the facilities set up to allow us to do this.

4.3       Delivery Addresses

We will send the documents to the e-mail addresses that you enter into the online form at the time of accepting our quotation. Please ensure that you enter the e-mail addresses of the people to whom you wish the document to be sent on the subsequent page after accepting. We will not issue documentation to individuals without your express permission.

5    Returns / Refunds

5.1       Cancelled Jobs

If you decide after instructing us that you no longer require our services we will offer a refund commensurate with the amount of work yet to be completed. If the work is 100% complete at the time you inform us that you wish to cancel, you will be liable to pay for the full amount invoiced. The proportion of refund available will be determined by PorthouseDean, however we will listen to any reasonable arguments against our refund offer and give them fair consideration. A minimum administrative charge of £150+Vat applies irrespective of how much work has been carried out.

It should be noted that by instructing PorthouseDean Limited you are committing to pay the full amount stated in the invoice relating to the quote that you have agreed to. As such PorthouseDean Limited reserves the right to claim the full amount of the agreed fee from you.

5.2       Calculations for Structures Specified / Designed by Others

If we are asked to numerically substantiate a structure which has been specified by others and are unable to substantiate that structure, then we reserve the right to issue the documentation with calculations that show that the structure is inadequate. You will not be entitled to a refund in this case, however, if possible / reasonable to do so we will advise you in advance of instruction whether or not we expect a structure to be adequate.

5.3       Documents Returned by Building Control on Technical Grounds

PorthouseDean Limited will do everything we can to satisfy technical concerns or queries raised by Building Control departments about any document that we have produced. In the unlikely event that one of our documents cannot be passed by building control on technical grounds (with the responsibility lying solely with PorthouseDean Limited) and we are unable to provide technical justification, we will offer refunds commensurate with the proportion of the structure that we have been unable to design to the satisfaction of building control.

It should be noted that in attempting to satisfy the requirements of building control we expect the cooperation of all concerned in terms of agreeing to any changes that may be required on site and working towards a solution that satisfies all concerned.

5.4       Request for Information Outside of Contract Scope by Building Control

If there is information required by building control that falls outside the scope of the agreed contract then there are two possible outcomes:

1)    If PorthouseDean Limited could reasonably have been expected to foresee a requirement for these elements by building control and have not offered them as part of our quotation, then we will provide the calculations for these elements at no additional charge and issue them as part of a revised document.

2)    If PorthouseDean Limited could not reasonably have been expected to foresee a requirement for these elements, or if these elements were included in the quotation as an “Additional Service” which we were not instructed to proceed with, then there will likely be an additional charge. The price for these items will either already have been quoted as part of the original quotation, or will be quoted for as part of a new quotation. You will need to instruct us for the additional items in order for us to proceed with the re-design.

5.5       Request for Information by Parties other than Building Control

Requests for information outside the scope of the agreed contract will likely be chargeable. The price for these items will either already have been quoted as part of the original quotation or will be quoted for as part of a new quotation. You will need to instruct us for the additional items for us to proceed with the re-design.

6    Complaints

If for whatever reason you are not satisfied with the service or product provided by PorthouseDean Limited you can submit your complaint by e-mail to either, or the e-mail address of the engineer that you dealt with as part of your preliminary appraisal / engagement. We will do our utmost to ensure that your complaint is dealt with in an effective and proactive manner.

7    Technical Queries

If you have any technical queries, then you can submit your query via e-mail to and we will aim to respond within 2 working days. Alternatively, please feel free to call one of our offices.

8    Change Requests

8.1       Review of Element Specifications

If you would like us to try to specify an element with different geometry or material properties (e.g. beam size, footing size, foundation ground bearing capacity) then we will review the document for you at least once at no additional charge. We will seek to agree the final specification with you prior to revising the documentation (if indeed the desired changes are possible).

8.2       Changes of Scope

Change requests should be submitted via the website at the following address: changes required which result from alterations to the initial proposals upon which our calculations or detailed drawings are based, or for work additional to that which was part of the original agreed scope of works, will be subject to additional fees.

9    Communications

Calls with PorthouseDean Ltd may be recorded for training and monitoring purposes.


10    Ground Condition Assumptions

If your project involves the design of a foundation or retaining wall and you have not communicated to us what the existing ground conditions are like on site, then we will assume a typical ground type/strength (e.g. firm clay or medium dense sand). It is the responsibility of your Building Control Officer to inspect the ground conditions prior to the commencement of work. For larger projects (e.g. new-build developments) it may be advisable to carry out a site investigation prior to instruction. Unless specifically noted, the quote doesn’t allow for “engineered” e.g. piled or raft type foundations. It allows for spread type foundations only.


11    Privacy Policy

This privacy policy sets out how PorthouseDean uses and protects any information that you give us when you use this website.

PorthouseDean is committed to ensuring that your privacy is protected. Should we ask you to provide certain information by which you can be identified when using this website, then you can be assured that it will only be used in accordance with this privacy statement.


We may collect the following information:

  • name and job title
  • contact information including email address
  • demographic information such as postcode
  • other relevant info such as surveys


We require this information to understand your needs and provide you with a better service, and in particular for the following reasons:

  • Internal record keeping.
  • We may use the information to improve our products and services.
  • We may periodically send promotional emails about new products, special offers or other information which we think you may find interesting using the email address which you have provided.

From time to time, we may also use your information to contact you for market research purposes. We may contact you by email, phone, fax or mail. We may use the information to customise the website according to your interests.


We are committed to ensuring that your information is secure. In order to prevent unauthorised access or disclosure, we have put in place suitable physical, electronic and managerial procedures to safeguard and secure the information we collect online.


A cookie is a small file which asks permission to be placed on your computer’s hard drive. Once you agree, the file is added and the cookie helps analyse web traffic or lets you know when you visit a particular site. Cookies allow web applications to respond to you as an individual. The web application can tailor its operations to your needs, likes and dislikes by gathering and remembering information about your preferences.

We use traffic log cookies to identify which pages are being used. This helps us analyse data about web page traffic and improve our website in order to tailor it to customer needs. We only use this information for statistical analysis purposes and then the data is removed from the system.

Overall, cookies help us provide you with a better website, by enabling us to monitor which pages you find useful and which you do not. A cookie in no way gives us access to your computer or any information about you, other than the data you choose to share with us.

You can choose to accept or decline cookies. Most web browsers automatically accept cookies, but you can usually modify your browser setting to decline cookies if you prefer. This may prevent you from taking full advantage of the website.


Our website may contain links to other websites of interest. However, once you have used these links to leave our site, you should note that we do not have any control over that other website. Therefore, we cannot be responsible for the protection and privacy of any information which you provide whilst visiting such sites and such sites are not governed by this privacy statement. You should exercise caution and look at the privacy statement applicable to the website in question.

You may choose to restrict the collection or use of your personal information or request us to delete any information that we may have. If so, please contact

We will not sell, distribute or lease your personal information to third parties unless we have your permission or are required by law to do so. We may use your personal information to send you promotional information about third parties which we think you may find interesting if you tell us that you wish this to happen.

You may request details of personal information which we hold about you under the GDPR. If you would like a copy of the information held on you please write to PorthouseDean Limited, 6th floor, F block, North Suite 2, St James’ Buildings, 61-95 Oxford Street, Manchester, M1 6EG, or alternatively e-mail

If you believe that any information we are holding on you is incorrect or incomplete, please write to or email us as soon as possible, at the above address. We will promptly correct any information found to be incorrect.