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4 Key Stages a Homeowner Should Know When Extending.

Writer's picture: Glenn ThompsonGlenn Thompson

Updated: Jan 21

If you're considering extending your home, or converting your attic space, don't hesitate to contact me. I am happy to offer you my initial advice without any obligation. The forthcoming guide will provide you with an understanding of the four key stages every homeowner should be aware of when extending a home.


4 Stages a Homeowner Should Know When Extending | By GT Building Design
Domestic extension by GT Building Design incorporating a new Garden Room, Utility and sheltered Patio.

To gain a clearer understanding of your home and your wishes, it would be beneficial if you could provide the following information. We can then discuss and I will confirm my fees for my architectural services.


  • Confirm your full name and address, including postcode.

  • Confirm your phone number and email address.

  • Provide a basic summary of your goals.

  • Confirm your maximum budget.

  • Take photos of your home, especially around the area where you plan to extend, and email them to me.

  • If you have any existing drawings of your home, please email them to me. Basic plans may have been prepared by an Estate Agent, or Building Control might have drawings from a previous application.


4 Stages a Homeowner Should Know When Extending | By GT Building Design
Your address will help me initially view your property, the garden space you have and the street view is very helpful to gain a quick understanding of your current home.

Architectural Fee Proposal:


After understanding the specifics of your project and your ideas, I will email you my Fee Proposal. This letter will detail my fees, the various stages involved, and any possible additional costs.


Additional costs might include the following: (Can vary on each project)

  • Builders estimate (no charge) or Quantity Surveyors estimate (£150 - £300). You might want a construction cost estimate from the design drawings before proceeding to the next stage.

  • Structural Engineers Fee (Payable to an Engineer if structural calculations are required)

  • Planning Application Fee (Payable to your local Council £327.00)

  • Building Control Plan and Inspection Fees (Payable to your local Council – varies, and I will confirm; estimate £250 - £350 for an extension)

  • SAP Energy Calculations. Payable to others (approx. £150), and your Council may request this.

  • Large Scale Vector from Ordnance Survey (£60.00) to prepare Site Location and Block Plans (Required by both the Planning Service & Building Control)


 

STAGE 1: MEASURED SURVEY & PREPARING EXISTING DRAWING


Once my written Architectural Fee Proposal is accepted by you, I will carry out a detailed measured survey of your home, usually taking 2-3 hours. Following this, I will produce existing plans and elevations using the latest CAD software.


During my measured survey, I will also take numerous photographs to assist in creating the existing drawings and, subsequently, in developing the initial Design Proposal.


4 Stages a Homeowner Should Know When Extending | By GT Building Design
A typical measured survey drawn by hand with measurements recorded, this would also include, elevations and heights.

4 Stages a Homeowner Should Know When Extending | By GT Building Design
Typical drawing of an existing home prepared by me using the latest CAD software.

 

STAGE 2: DESIGN PROPOSALS


I will ask you to email me your wish list, your maximum budget, must-haves, and would-like items (non-essential items) if space and budget allows. Your wish list will serve as a basis for me to develop the initial design proposals and begin our discussions.


4 Stages a Homeowner Should Know When Extending | By GT Building Design
If you can prepare a "Wish List" for me that would be great

There are often several ways to extend a home, with the first option being adaptable to fit your needs. Sometimes, additional options may be necessary. Rest assured that options can be altered or replaced, and we can keep working together until we find the ideal solution for you. ❤️


Once Stage 2 (Design Proposals) is complete, you might want to get a construction estimate from a Builder, usually provided for free. If needed, a Quantity Surveyor can also give an estimate for a fee between £150 and £300.


Unfortunately, I cannot provide estimates due to the changing nature of construction costs and differ on each project.


4 Stages a Homeowner Should Know When Extending | By GT Building Design
Design Proposals Example

 

STAGE 3: PLANNING APPLICATION


There are two ways to secure written formal approval from the Planning Service.


I recommend my clients obtain either Full Planning Permission or a Certificate of Lawful Development to provide peace of mind. This will also ensure everything is in order with your neighbours and a Solicitor will request written evidence of this if you or your family decide to sell the home at any stage in the future.


A Certificate of Lawful Development is typically used for small extensions that fall within permitted development rights. This application requires the same amount of time and preparation of drawings but has limitations on what can and cannot be done; it’s restrictive.


I will prepare the planning application documents, including existing and proposed plans / elevations, existing and proposed block plans, a Householders Design Statement (if necessary), along with a Site Location Plan.


I will submit and manage a planning application on your behalf and communicate with the Planning Service throughout the process. Once submitted, a Planning Application for an extension typically takes around 2 to 3 months.


4 Stages a Homeowner Should Know When Extending | By GT Building Design
Typical Planning Application drawing showing existing and proposed plans and elevations.
4 Stages a Homeowner Should Know When Extending | By GT Building Design
Planning Service may also ask for a Householders Design Statement and if required I will prepare this and submit to the Planning Service on your behalf.


 

STAGE 4: BUILDING CONTROL APPLICATION


This stage involves producing detailed construction drawings and a written specification booklet, both must adhere to the stringent Building Control Regulations.


It may also include a Structural Engineer's design and calculation document.


The drawings and specification must include all necessary information to comply with current construction standards and regulations.


I will manage the entire Building Regulations Application process for you, liaising with Building Control and providing any additional information they might require to obtain your Notice of Approval.


These approved drawings and specification will act as a pricing package for a builder. After finalising construction costs, these documents will also form the contract between you and a builder.


4 Stages a Homeowner Should Know When Extending | By GT Building Design
Typical construction drawing including details to obtain Building Control Approval and form the contract between you and your builder.


 

IN SUMMARY:


Several of my clients have mentioned that they are not familiar with the steps and processes involved in home extensions. I hope this guide offers the clarity and help you need.


If you have any questions, need further guidance, or are interested in discussing potential collaboration for improving and extending your home, please feel free to contact me.


Thank you, Glenn. 07719912695




GT Building Design | Chartered Architectural Practice | Donaghadee



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