Share this
The Importance of Opening Up Works: House Extensions
by Sean Hill on Mar 5, 2023
As an architect practice with over 40 years of combined experience, we have come to realise the importance of opening up works when it comes to drawing up structural designs for a house extension. These works not only minimise guesswork but also provide a solid baseline for understanding the existing structure of the building, allowing us to plan and execute the new space safely and efficiently.
When it comes to structural investigations, it is not uncommon for the Structural Engineer to make assumptions about the building before crunching the numbers of the structural design. However, relying solely on assumptions carries significant risks. Therefore, whenever possible, it is preferable to carry out opening up works as a means of gathering concrete information about the structure, ensuring that the design process is based on accurate data rather than guesswork.
Opening up works are typically requested by the Structural Engineer, and sometimes the Architect, when there is a need for further investigation of the building’s structure. These works involve carefully stripping away precise surface areas to reveal specific sections of the underlying structure that the Structural Engineer needs to physically inspect before producing a suitable structural design for the extension.
There are four common types of opening up works that are often carried out for extensions:
- Trial pits: These are holes, usually measuring around 1 square meter, that are excavated by hand and positioned adjacent to the outside wall of the building. The purpose of trial pits is to check the depth and type of foundations that the building sits upon, providing essential information for the design process.
- Lifting floorboards: This type of opening up work is performed to investigate various aspects, such as the continuity of suspected load-bearing walls, the condition of dwarf walls, joist integrity, and water table saturation. It is crucial to minimise the disturbance to the flooring and only remove the necessary sections for inspection.
- Boarded attics: Attic spaces are sometimes boarded over, and these boards may need to be removed to assess the presence of voids behind or beneath them, as well as to check the direction and sizing of joists. Fortunately, the advent of keyhole cameras has allowed us to minimise disruption during this process.
- Exposing walls and ceilings: In some cases, sections of plastered walls and/or ceilings need to be removed to inspect the presence of supporting members, such as reinforced steel girders. Additionally, exposing walls and ceilings allows us to check for the existence of spreader plates supporting the girders, the integrity of the supporting wall, and the nature and quality of any connections.
When carrying out opening up works for an extension, it is best practice to have the instructing Structural Engineer present along with the tradesmen. This ensures that the tradesmen can work under the direct instruction of the Structural Engineer and allows for real-time inspections. By being present on-site, the Structural Engineer can inspect the exposed areas firsthand, avoiding the need to rely solely on photographs. Moreover, this approach holds the Structural Engineer accountable for the work they produce and ensures that their expertise is fully utilised.
To minimise disruption, it is important to keep the size of the openings as lean as practicable. Additionally, any necessary making-good should ideally be completed on the same day, immediately after the inspection. This helps to maintain the project’s momentum and ensures that the opening up works do not cause unnecessary delays.
Undoubtedly, carrying out opening up works for an extension can be a logistical challenge and may cause temporary inconveniences. However, the benefits of doing so far outweigh the temporary disruptions. These works allow the Structural Engineer to accurately baseline the makeup of the building, providing vital information for designing an optimally structured extension. By avoiding assumptions and relying on concrete data, we can create designs that are not only safe but also efficient and sustainable, aligning with our studio’s focus on low energy and low embodied carbon designs.
In conclusion, when embarking on a house extension project, it is essential to prioritise opening up works. These works serve as a critical step in the design process, allowing us to understand the existing structure, identify potential issues, and develop an extension that seamlessly integrates with the building. By investing in opening up works, we can ensure that our designs are not only beautiful but also structurally sound, energy-efficient, and environmentally conscious. So, embrace the process, trust in the expertise of your Structural Engineer, and unlock the true potential of your home with a well-planned and thoughtfully executed house extension.
Share this
- Architecture (146)
- Sustainable architecture (85)
- Design (66)
- Retrofit (55)
- Passivhaus (53)
- London (51)
- New build (48)
- Renovation (41)
- energy (38)
- interior design (37)
- Sustainable Design (34)
- Planning (32)
- Environment (31)
- Building materials (30)
- climate-change (29)
- Inspirational architects (27)
- Refurbishment (27)
- extensions (27)
- Building elements (22)
- Inspiration (21)
- Rise Projects (16)
- enerphit (16)
- Extension (13)
- net zero (13)
- General (12)
- Philosophy (12)
- Carbon Zero Homes (11)
- Working with an architect (10)
- architects (10)
- Awards (9)
- Innovative Architecture (9)
- London Architecture (8)
- RIBA (8)
- architect (8)
- Airtightness (6)
- Eenergy efficiency (6)
- Uncategorized (6)
- Virtual Reality (6)
- RISE Sketchbook Chronicles (5)
- Sustainable (5)
- cinema design (5)
- ARB (4)
- BIM (4)
- Basement Extensions (4)
- concrete (4)
- local materials (4)
- modular architecture (4)
- working from home (4)
- Carbon Positive Buildings (3)
- Home improvement (3)
- Passive house (3)
- Permitted development (3)
- Planning permission (3)
- Property (3)
- circular economy (3)
- construction (3)
- mvhr (3)
- natural materials (3)
- plywood (3)
- structural (3)
- structuralengineer (3)
- Artificial Intelligence (AI) (2)
- Bricks (2)
- Building in the Green Belt (2)
- Costs (2)
- Covid-19 (2)
- Heat Pumps (2)
- Home extensions (2)
- Permitted development rights (2)
- Residential architecture (2)
- Roof extension (2)
- Social Distancing (2)
- Welbeing (2)
- ashp (2)
- barcelona (2)
- building information modelling (2)
- co-working (2)
- design&build (2)
- furniture (2)
- glazed-extensions (2)
- green architecture (2)
- greenbelt (2)
- historic architecture (2)
- light (2)
- living space (2)
- london landmarks (2)
- londoncinemas (2)
- openingupworks (2)
- peter zumthor (2)
- rammed earth (2)
- self build (2)
- sustainability (2)
- sustainable building (2)
- traditional (2)
- trialpits (2)
- #NLANetZero (1)
- 3D Printing (1)
- 3D models (1)
- Adobe (1)
- Alvar (1)
- Architecture Interior Design (1)
- Area (1)
- Art (1)
- BIMx (1)
- BREEAM (1)
- Bespoke lighting (1)
- Birmingham Selfridges (1)
- Boat building (1)
- Boats (1)
- Brass (1)
- Brexit (1)
- Building energy (1)
- Casting (1)
- Chailey Brick (1)
- Chartered architect (1)
- Commercial Architecture (1)
- Copper (1)
- Czech Republic, (1)
- David Lea (1)
- Dormer extension (1)
- Ecohouse (1)
- Fees (1)
- Flooding (1)
- Furniture design (1)
- Gandhi memorial museum (1)
- Garden studio (1)
- Green Register (1)
- Green infrastructure (1)
- History (1)
- House cost (1)
- India (1)
- Jan Kaplický (1)
- Kitchen Design (1)
- L-shaped dormer (1)
- Land value (1)
- Loft conversion (1)
- Lord's Media Centre (1)
- Mapping (1)
- Marseilles (1)
- Mary Portas (1)
- Metal (1)
- Micro Generation (1)
- Monuments (1)
- Party Wall Surveyor (1)
- Place (1)
- Porch (1)
- Prefab (1)
- Procurement (1)
- Richard Rogers (1)
- Sand (1)
- Scandinavian architecture (1)
- Selfbuild (1)
- Social housing (1)
- Spain (1)
- Steel (1)
- Surveying (1)
- Sverre fehn (1)
- VR (1)
- West london (1)
- Wildlife (1)
- Wood (1)
- architect fees (1)
- architectural details (1)
- arne jacobsen (1)
- avant garde (1)
- backland (1)
- basements (1)
- brentdesignawards (1)
- building design (1)
- building regulations (1)
- built environment (1)
- carbonpositive (1)
- cement (1)
- charles correa (1)
- charles eames (1)
- charlie warde (1)
- charteredarchitect (1)
- climate (1)
- climate action (1)
- codes of practice (1)
- collaboration (1)
- constructioncosts (1)
- country house (1)
- countryside (1)
- covid (1)
- dezeenawards (1)
- drone (1)
- eco-living (1)
- emissions (1)
- epc (1)
- finnish architecture (1)
- foundations (1)
- futuristic (1)
- georgian architecture (1)
- glazed envelope (1)
- good working relationships (1)
- green building (1)
- hampstead (1)
- happiness (1)
- health and wellbeing (1)
- home extension (1)
- homesurveys (1)
- house extension (1)
- imperfection (1)
- independentcinemas (1)
- innovation (1)
- inspirational (1)
- insulation (1)
- interiorfinishes (1)
- internal windows (1)
- jean prouve (1)
- kindness economy (1)
- kintsugi (1)
- landscape architecture (1)
- lime (1)
- listed buildings (1)
- local (1)
- lockdown (1)
- low carbon (1)
- mansard (1)
- manufacturing (1)
- materiality (1)
- modern architecture (1)
- moderninst (1)
- modernism (1)
- moulded furniture (1)
- natural (1)
- natural cooling (1)
- natural light (1)
- nordic pavilion (1)
- northern ireland (1)
- palazzo (1)
- placemaking (1)
- planningpermission (1)
- plywood kitchen (1)
- post-Covid (1)
- poverty (1)
- powerhouse (1)
- preapp (1)
- preapplication (1)
- project management (1)
- ray eames (1)
- reclaimed bricks (1)
- recycle (1)
- renewable energy (1)
- reuse (1)
- ricardo bofill (1)
- rooflights (1)
- room reconfiguration (1)
- rural (1)
- satellite imagery (1)
- selfbuildhouse (1)
- shared spaces (1)
- site-progress (1)
- solarpvs (1)
- space (1)
- stone (1)
- structuralsurvey (1)
- sun tunnel (1)
- sustainable materials (1)
- terraces (1)
- thegreenregister (1)
- totality (1)
- wabi-sabi (1)
- waste (1)
- wooden furniture (1)
- zero waste (1)
- December 2024 (1)
- November 2024 (8)
- October 2024 (5)
- June 2024 (1)
- May 2024 (1)
- March 2024 (1)
- February 2024 (1)
- January 2024 (2)
- November 2023 (1)
- October 2023 (5)
- September 2023 (7)
- August 2023 (7)
- July 2023 (6)
- June 2023 (8)
- May 2023 (14)
- April 2023 (11)
- March 2023 (8)
- February 2023 (6)
- January 2023 (5)
- December 2022 (3)
- November 2022 (3)
- October 2022 (3)
- September 2022 (3)
- July 2022 (2)
- June 2022 (1)
- May 2022 (1)
- April 2022 (1)
- March 2022 (1)
- February 2022 (2)
- January 2022 (1)
- November 2021 (1)
- October 2021 (2)
- July 2021 (1)
- June 2021 (1)
- May 2021 (1)
- April 2021 (1)
- March 2021 (1)
- February 2021 (1)
- January 2021 (2)
- December 2020 (1)
- November 2020 (1)
- October 2020 (1)
- September 2020 (2)
- August 2020 (1)
- June 2020 (3)
- April 2020 (3)
- March 2020 (2)
- February 2020 (3)
- January 2020 (1)
- December 2019 (1)
- November 2019 (2)
- September 2019 (1)
- June 2019 (1)
- April 2019 (2)
- January 2019 (2)
- October 2018 (1)
- September 2018 (1)
- August 2018 (2)
- July 2018 (1)
- March 2018 (1)
- February 2018 (2)
- December 2017 (1)
- September 2017 (1)
- May 2017 (1)
- January 2017 (1)
- December 2016 (1)
- November 2016 (1)
- September 2016 (1)
- August 2016 (2)
- June 2016 (2)
- May 2016 (1)
- April 2016 (1)
- December 2015 (1)
- October 2015 (1)
- September 2015 (1)
- August 2015 (1)
- June 2015 (1)
- January 2015 (1)
- September 2014 (2)
- August 2014 (1)
- July 2014 (4)
- June 2014 (9)
- May 2014 (2)
- April 2014 (1)
- March 2014 (1)
- February 2014 (1)
- December 2013 (1)
- November 2013 (5)
- October 2013 (5)
- September 2013 (5)
- August 2013 (5)
- July 2013 (5)
- June 2013 (2)
- May 2013 (2)
- April 2013 (4)
- March 2013 (5)
- February 2013 (2)
- January 2013 (3)