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Building Regs Specifications and Detail Drawings
Specifications
Wales
November 2022
changes
House Extension
House Extension Specifications for Construction Plans
Loft Conversion
Loft Conversion Specifications for Construction Plans
Garage Conversion
Garage Conversion Specifications for Construction Plans
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New Build Specifications for Construction Plans
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Flat Conversion Specifications for Construction Plans
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Basement Conversion Specifications for Construction Plans
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June 2022
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Building Regs 4 Plans: General Info

We are no longer a reseller of CAD Software but we continue to provide a library of Building Regs Specifications and Detail Drawings.

Sample Building Notes


FULL FILL CAVITY WALL
To achieve minimum U Value of 0.18 W/m²K
20mm two coat sand/cement render to comply to BS EN 13914-1 with waterproof additive on 100mm lightweight block, 0.15 W/m²K, e.g. Celcon solar, Toplite Standard.
Fully fill the cavity with 150mm Dritherm 32 cavity insulation as manufacturer's spec.
Inner leaf to be 100mm lightweight, 0.15 W/m²K, e.g. Celcon solar, Toplite standard.
Internal finish to be 12.5mm plasterboard on dabs.....register here for our full specifications and web apps.

TIMBER FRAME WALL
To achieve minimum U Value of 0.18 W/m²K
Outer skin to be 102mm suitable facing brick with 50mm vented and drained cavity provided between the stud and brick cladding.
Inner stud to have breathable membrane (a vapour resistance of not more than 0.6 MNs/g) fixed to 12mm thick W.B.P external quality plywood sheathing (or other approved).
Ply fixed to treated timber frame studs constructed using 150mm x 50mm treated timbers with head and sole plates and vertical studs (with noggins) at 400mm ctrs, or to s/engineer's details and calculations.
Insulation to be 70mm Kingspan Kooltherm between studs with .....register here for our full specifications and web apps.

RAINWATER DRAINAGE
New rainwater goods to be new 110mm UPVC half round gutters taken and connected into 68mm dia UPVC downpipes.
Rainwater taken to new soakaway, situated a min distance of 5.0m away from any building, via 110mm dia UPVC pipes surrounded in 150mm granular fill.
Soakaway to be min of 1 cubic metre capacity (or to depth to Local Authority approval), filled with suitable granular fill and provided with geotextile surround to prevent migration of fines.
If necessary carry out.....register here for our full specifications and web apps.

BLOCK AND BEAM FLOOR VENTILATION
Provide cross-ventilation of the under floor to outside air by ventilators in at least 2 opposite external walls of the building.
Ventilation openings having an opening area of 1500mm² per metre run of perimeter wall or.....register here for our full specifications and web apps.

SOLID BRICK WALL WITH EXTERNAL INSULATION
To achieve minimum U Value of 0.18 W/m²K
Mechanically fix 100mm Kingspan Kooltherm K5 external wall board to 215mm solid brick wall built using 1:1:6 cement mortar.
Insulation boards to be fixed using thermally broken proprietary telescopic tube fasteners at max 1m centres driven into pre-drilled holes, ensure a minimum of 5 fixings per insulation board.
Apply 20mm of suitable reinforced render with waterproof additive with a scraped or textured finish. Render to be applied directly to the insulation incorporating eml or glass fibre mesh.
Movement joints to.....register here for our full specifications and web apps.

Concise Construction Notes like these can be added to your Building Regulations Specification in just a few clicks within the Web Apps!

Adding a Timber Suspended Floor Note to a Specification

More help and guidance, including advice on advanced functions, please see the Further Info Guide.
A Step Beyond Guidance - Construction Specifications for Home Extension, Loft, Basement, Flat & Garage Conversion Plans
Building Regs 4 Plans: General Info

We are no longer a reseller of CAD Software but we continue to provide a library of Building Regs Specifications and Detail Drawings.

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See Frequently Asked Questions for general info on BuildingRegs4Plans, Logging-In, Registration, Purchasing Drawings etc




Sample Building Notes

FULL FILL CAVITY WALL
To achieve minimum U Value of 0.18 W/m²K
20mm two coat sand/cement render to comply to BS EN 13914-1 with waterproof additive on 100mm lightweight block, 0.15 W/m²K, e.g. Celcon solar, Toplite Standard.
Fully fill the cavity with 150mm Dritherm 32 cavity insulation as manufacturer's spec.
Inner leaf to be 100mm lightweight, 0.15 W/m²K, e.g. Celcon solar, Toplite standard.
Internal finish to be 12.5mm plasterboard on dabs.....register here for our full specifications and web apps.

TIMBER FRAME WALL
To achieve minimum U Value of 0.18 W/m²K
Outer skin to be 102mm suitable facing brick with 50mm vented and drained cavity provided between the stud and brick cladding.
Inner stud to have breathable membrane (a vapour resistance of not more than 0.6 MNs/g) fixed to 12mm thick W.B.P external quality plywood sheathing (or other approved).
Ply fixed to treated timber frame studs constructed using 150mm x 50mm treated timbers with head and sole plates and vertical studs (with noggins) at 400mm ctrs, or to s/engineer's details and calculations.
Insulation to be 70mm Kingspan Kooltherm between studs with.....register here for our full specifications and web apps.

RAINWATER DRAINAGE
New rainwater goods to be new 110mm UPVC half round gutters taken and connected into 68mm dia UPVC downpipes.
Rainwater taken to new soakaway, situated a min distance of 5.0m away from any building, via 110mm dia UPVC pipes surrounded in 150mm granular fill.
Soakaway to be min of 1 cubic metre capacity (or to depth to Local Authority approval), filled with suitable granular fill and provided with geotextile surround to prevent migration of fines.
If necessary carry out.....register here for our full specifications and web apps.

BLOCK AND BEAM FLOOR VENTILATION
Provide cross-ventilation of the under floor to outside air by ventilators in at least 2 opposite external walls of the building.
Ventilation openings having an opening area of 1500mm² per metre run of perimeter wall or.....register here for our full specifications and web apps.

SOLID BRICK WALL WITH EXTERNAL INSULATION
To achieve minimum U Value of 0.18 W/m²K
Mechanically fix 100mm Kingspan Kooltherm K5 external wall board to 215mm solid brick wall built using 1:1:6 cement mortar.
Insulation boards to be fixed using thermally broken proprietary telescopic tube fasteners at max 1m centres driven into pre-drilled holes, ensure a minimum of 5 fixings per insulation board.
Apply 20mm of suitable reinforced render with waterproof additive with a scraped or textured finish. Render to be applied directly to the insulation incorporating eml or glass fibre mesh.
Movement joints to.....register here for our full specifications and web apps.

Concise Construction Notes like these can be added to your Building Regulations Specification in just a few clicks within the Web Apps!

Adding a Timber Suspended Floor Note to a Specification

More help and guidance, including advice on advanced functions, please see the Further Info Guide.

To begin compiling your Building Regulations Specification, choose either House Extension, New Build, Flat Conversion, Loft Conversion, Garage Conversion or Garage Build.

A Step Beyond Guidance - Construction Specifications for Home Extension, Loft & Garage Conversion Plans - Advice & Guidance
House Extensions Guidance

When compiling Building Regulations Notes for House Extensions, bear in mind that Building Control or your Approved Inspector will want to see a comprehensive list of Building Specifications including floor type (eg solid floor), roof construction, wall type and construction, and foundation type.

The House Extensions Specifications should include notes covering aspects of Fire Safety such as smoke detection, and Escape Windows from First Floor Rooms, where applicable.

Structural Calculations and Details should also be included as part of the Building Control / Approved Inspector Submission.

Work through the categories on the left side of our House Extensions App to make sure you have included necessary specifications.

You should always check with your Building Control Officer or Approved Inspector for guidance regarding any additional details that may be required.

Loft Conversions Guidance

As well as notes for standard construction details, Loft Conversions Specifications should include notes for:

  • Provisions for Means of Escape in Case of Fire
  • Dormer Walls and Roofs
  • Upgrading of existing external walls, party walls and roofs
  • Dwarf / Ashlar Walls
  • Stairs
  • Upgrading of internal floors for fire resistance

Work through the categories on the left side of our Loft Conversions App to make sure you have included necessary specifications.

Structural Calculations and Details should also be included as part of the Building Control / Approved Inspector Submission.

Check with your Building Control Officer or Approved Inspector for guidance regarding additional details that may be required.

Garage Conversions Guidance

In addition to the Building Regulations notes for the standard construction details, Garage Conversions Specifications should include notes for:

  • New Infill External Walls
  • Upgrading existing external walls
  • Upgrade party walls and roofs, if required
  • Upgrading of existing floors including thermal and damp upgrade

Work through the categories on the left-hand panel of our Garage Conversions App to make sure you have included necessary building specifications.

You should always check with your Local Authority Building Control Officer or Approved Inspector for guidance regarding any additional details that may be required.