Sustainability, Retrofit & Passive House Design Consultancy

As the built environment moves toward a more sustainable future, NI Surveys supports homeowners, developers, and commercial property owners with expert advice on retrofit design, energy efficiency, and Passive House principles. Our experienced retrofit designers and Chartered Building Surveyors help you reduce carbon impact, improve energy performance, and plan cost-effective upgrade strategies.

Our qualified retrofit advisors and retrofit surveyors carry out detailed assessments, identifying the most efficient ways to improve insulation, airtightness, and building fabric — ensuring upgrades meet PAS 2035 standards and Passive House retrofit (EnerPHit) performance targets.

Our Sustainability & Retrofit Services

We offer practical, data-driven solutions that align with regulatory standards and best practices in sustainable construction and refurbishment. Services include:

  • Retrofit Assessments & Feasibility Studies – delivered by experienced retrofit specialists to identify energy-saving measures and improvement opportunities.
  • Passive House Retrofit Consultancy (EnerPHit) – expert support from a certified Passive House retrofit consultant on insulation, airtightness, and low-energy building envelope detailing.
  • Retrofit Design & Cost Planning – independent retrofit cost and Passive House retrofit cost analysis for project budgeting and funding applications.
  • Building Performance Analysis – including thermal imaging, moisture monitoring, and air-tightness testing to enhance comfort and reduce running costs.
  • Lifecycle & Carbon Reporting – transparent, measurable data for ESG and sustainability reporting requirements.

Who We Work With

Our sustainability and retrofit consultants work across both the public and private sectors — from housing associations and local authorities to private developers and homeowners — providing guidance at feasibility, design, and post-occupancy stages.

Retrofit Design & Cost Consultancy

As experienced retrofit designers, we help clients plan low-carbon retrofits that are practical, affordable, and effective. Our retrofit cost planning service provides transparent budget estimates and lifecycle value assessments to support funding and compliance.

Why Choose NI Surveys?

As RICS Chartered Building Surveyors, we combine traditional surveying expertise with advanced sustainability and energy performance knowledge. Our independent consultancy ensures every recommendation is evidence-based, compliant, and aligned with your goals.

  • RICS-accredited retrofit specialists and Passive House retrofit consultants
  • Comprehensive retrofit assessments and energy modelling
  • Independent retrofit advisors offering unbiased, practical solutions
  • Clear retrofit cost advice and funding guidance

Get in Touch

Whether you need a professional retrofit assessment, expert advice on Passive House retrofit costs, or a qualified retrofit consultant to guide your sustainability project, contact NI Surveys today for tailored, data-driven support.

Quick Quote

Partner With NI Surveys

NI Surveys is an independent firm of RICS Chartered Building Surveyors based in Belfast, providing professional surveying and consultancy services to the commercial, industrial and public sectors across Northern Ireland. We support landlords, developers and occupiers with expert advice on property condition, compliance, and project delivery.

Customer Testimonials

We needed a homebuyer's report and NI Surveys did a fantastic job. The report produced was very thorough and comprehensive. The response time was very quick, NI Surveys were very helpful and answered all the questions we had.

Paula S

NI Surveys produced a very comprehensive and detailed house buyer report, containing practical suggestions for potential works required. Communication after was good and I was confident that any future questions that I may have, would be answered. Definitely recommend.

Eoin Q

NI Surveys provided us with an excellent, well-detailed survey full of illustrations, pictures and helpful advice. The communication from the company was excellent, they were always at hand for a quick phonecall or to help clarify anything I didn't understand, and they were competitively priced. I would highly recommend them to anyone looking for a home report or full survey in Belfast (and beyond!). Thank you very much.

Semeon O

NI Surveys was very accomodating to me, needing a survey done at shorter notice. Excellent service by way of communicating, answering my questions and keeping me updated at each stage of the process. Should I need a surveyor again I would absolutely use NI Surveys.

Sophie G

Excellent service from NI Surveys. Their structural survey report was very comprehensive whilst also being very reader-friendly and was completed in a very quick-turnaround. They were very helpful with additional questions I had regarding the report and responded within less than 24 hours too, which was a huge help. Would certainly highly recommend.

Gerard S

NI Surveys were brilliant. They completed a comprehensive homebuyer survey for us and turned it around really quickly. So polite and helpful. Would highly recommend. Thank you.

Claire K

We required a building survey for our new home and NI Surveys were fantastic. They were very fast response time and our survey report was extensive, easy to read and understand.

Aaron & Jessica R