| Abbreviation | Definition |
|---|---|
| NEC | National Electrical Code |
| NECB | National Energy Code of Canada for Buildings |
| NFPA | National Fire Protection Association |
| NFS | Not Further Specified |
| NG | Near Ground |
| NG | No Gaps |
| NG | Non-Geometric |
| NGHP | Natural Gas Heat Pump |
| NH | Nil Height |
| NH | No Hall |
| NH | No Heat |
| NHH | New Hope Housing |
| NHS | Nice Homely Surroundings |
| NI | Non-Insulated |
| NID | National Institute of Design |
| NKBA | National Kitchen & Bath Association |
| NLA | New London Architecture |
| NLAA | Newfoundland and Labrador Association of Architects |
| NMA | Nicole Migeon Architect |
| NMDA | Neil M Denari Architects |