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Expert Architects in Ipswich
Northgate Building Design has been delivering architectural and energy consultancy services across Suffolk and Essex for over two decades. Our team combines extensive industry experience with a commitment to providing tailored, cost-effective solutions for residential projects of all scales. From initial concept designs to building regulation submissions, we guide clients through every stage of their development. Our in-house energy assessment specialists are accredited to conduct SAP calculations and issue Energy Performance Certificates, ensuring compliance with current building regulations.

We prioritise clear communication and practical advice, helping clients achieve their vision while avoiding unnecessary redesigns or costly interventions. Our expertise extends to dynamic thermal modelling for Part O compliance, offering innovative solutions for modern construction challenges.
Services
Architectural Design SAP Calculations EPCs Thermal Modelling Measured Surveys
Highlights and features
  • We offer 20+ years of architectural and energy compliance expertise
  • Our tailored service minimises costly redesigns and interventions
  • Competitive rates for SAP calculations and EPCs
  • No site visits required for calculations - service available nationally
  • Specialist knowledge of Part O compliance and thermal modelling
Associations and certifications
  • On Construction Domestic Energy Assessor (OCDEA)
What people say
Excellent service First class plans Reasonably priced Highly recommend Simply superb builders
Services
Architectural Design
We create tailored architectural designs for residential extensions, conversions, and new builds. Our team guides projects from initial concept through planning approval to building regulation compliance. Clients receive detailed drawings and specifications that reflect their vision while meeting technical requirements.
SAP Calculations
Our accredited assessors conduct SAP calculations to demonstrate compliance with Part L regulations. We offer both 'As Design' calculations during planning and 'As Built' assessments post-construction. This includes issuing Energy Performance Certificates required for building control sign-off.
Thermal Modelling
We perform dynamic thermal modelling using CIBSE TM59 standards to address Part O overheating requirements. Our 3D modelling assesses solar gains, ventilation strategies, and mechanical systems to ensure compliance while preserving design intent.
Measured Surveys
Our surveyors produce accurate floor plans and elevations for existing properties. This forms the technical basis for extension projects, conversions, or renovation works. Surveys integrate with our design and compliance services for seamless project delivery.
EPCs
We issue Energy Performance Certificates for new dwellings following building completion. Our process includes final data collection, calculation verification, and official EPC lodgement required for regulatory compliance and property marketing.
Questions
What architectural services do you offer?
We provide full architectural design services for extensions, conversions, and new builds across Suffolk and Essex.
Do you handle energy compliance calculations?
Yes, we conduct SAP calculations, EPCs, and TM59 thermal modelling to meet building regulations.
Can you assist with planning applications?
Our team supports clients through concept design, planning submission, and building regulation approval processes.
Do you work outside Suffolk and Essex?
While based in Ipswich, we provide calculation services nationally without requiring site visits.
How quickly can you complete calculations?
We prioritise timely delivery of SAP and thermal modelling calculations while maintaining technical accuracy.
Reviews (3)
Susan Polley
Jan 07, 2021 Report
Neil is a really good Architect who will listen to your needs and requirements for your design
We are very pleased with our Finished double extension it has Totally transformed the look of our house we will not hesitate recommending Neil to anyone looking to have your building redesigned and what a nice person he is too
Susan & Trevor
Gillian Clark
Jun 15, 2019 Report
We have found Neil Goodhall (RGP) an excellent architect. He provided a very good service, advising us on all our options and talking us through each stage of the planning stages. We wouldn't hesitate in recommending him to anyone who is looking for an architect.
David and Gill
David Sarjeant
Jan 14, 2019 Report
Anyone looking for an architect or structural consultancy should use RGP. Neil Goodall was our Architect for the extension which has just been completed. Neil provided excellent service and his plans were first class as well as reasonably priced. When it came to seeking builders Neill gave us 3 suggestions and we used MJS Building Services who have been simply superb. We honestly could not have chosen better than starting with Neil and I would always recommend him without any shadow of doubt.